Merge branch 'feature/texture_displacement' of https://github.com/OrcaSlicer/OrcaSlicer into feature/texture_displacement

# Description

Typo introduced a regression failure. Fixes failing tests.

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TEXTURE_DISPLACEMENT.md

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+# Texture Displacement - Technical Notes
+
+Branch: `feature/texture_displacement`. This document is a knowledge dump of the whole feature as
+it stands: architecture, file map, algorithms, known bugs found and fixed (with root causes worth
+remembering), and what's still deferred. Written so a fresh session (or a fresh pair of eyes) can
+pick this up without re-deriving everything from scratch.
+
+## What it does
+
+A paint-style gizmo (`GLGizmoTextureDisplacement`) that lets you:
+- Paint one or more "layers" onto a model's surface, each a height-map texture with its own
+  depth/tiling/rotation/offset/invert/tile-mode/projection-mode/blend-mode.
+- Pick a texture from a shipped library (`resources/textures/displacement/`) or import your own
+  (saved into `<data_dir>/textures/displacement/`, kept separate so app updates can't clobber it).
+- Combine overlapping layers with image-editor-style blend modes (Add/Subtract/Multiply/Divide).
+- Preview the true displaced result live, before baking (background job, not on the UI thread).
+- Optionally preview via a fast GPU bump-map shader instead (no real geometry movement, just
+  shading) for a lighter-weight alternative.
+- Bake into real mesh geometry on demand, restricted to the painted area only.
+- Subdivide a low-poly model first so there are enough vertices to show fine detail.
+- Unwrap a painted patch with a real CGAL LSCM parameterization and view it in a dedicated,
+  dockable 2D "UV Editor" pane.
+
+## Architecture
+
+### Data model (per `ModelVolume`)
+
+Each of up to `TEXTURE_DISPLACEMENT_MAX_LAYERS` (8) layers gets its **own independent
+`FacetsAnnotation`** paint mask - the exact same `TriangleSelector`/`FacetsAnnotation` machinery
+every other paint gizmo (FdmSupports, Seam, MMU, FuzzySkin) already uses, just one full instance
+per layer slot instead of one per volume. This is what makes "layered/blended" painting work for
+free: the same triangle can be `ENFORCER` in layer 2's mask and layer 5's mask simultaneously, and
+at bake/preview time each layer displaces the surface left by the previous one (image-editor-layer
+semantics).
+
+### Bake algorithm (`libslic3r/TextureDisplacement.cpp`)
+
+`build_texture_displacement(base_mesh, layers, facets_data)` is **accumulate-then-displace, and
+topology-preserving**: the returned mesh has exactly the input's vertices and triangles, in the same
+order - only the positions of displaced vertices differ.
+
+1. `its_compactify_vertices()` on a copy of the input. In practice a no-op (it only drops
+   *unreferenced* vertices, and preserves the order and indices of the rest). It is there to
+   guarantee the index alignment step 3 depends on.
+2. Area-weighted vertex normals of the **undisplaced** mesh, computed once. Every layer both
+   projects and displaces along these, so a vertex covered by several layers moves along one single
+   well-defined direction.
+3. For each layer in slot order: deserialize its stored paint mask into a `TriangleSelector` against
+   the **base mesh** (never against a previous layer's output), then
+   `selector.get_facets_strict(ENFORCER)` → the painted patch. Two facts are exploited:
+   - `get_facets_strict()` returns the mesh's **entire** referenced vertex array regardless of which
+     state was asked for - only `.indices` is filtered by state. So `get_facets_strict(ENFORCER)`
+     and `get_facets_strict(NONE)` share identical vertex indexing, which is what lets boundary
+     detection be a plain index check instead of a position-hash lookup.
+   - The selector's vertex array *starts with* the mesh's own vertices (extra ones created where a
+     brush stroke split a triangle are appended after them), and `get_facets_strict()` emits the
+     referenced ones in order. Combined with step 1, **selector vertex index `i` is our vertex `i`**.
+     Split vertices live past the end of our array and are simply skipped - they sit on the paint
+     boundary anyway (splitting only happens at partial coverage), so they would be pinned regardless.
+4. A vertex used by at least one **unpainted** triangle is a boundary vertex - pinned, never
+   displaced (its final position is ambiguous, it belongs to both regions). Only vertices used
+   exclusively by painted triangles get displaced. This is what keeps bakes seamless with zero
+   remeshing/hole-filling at the seam.
+5. Per interior vertex: sample the height texture (`sample_layer_height()`, see Projection methods)
+   and fold `height * depth_mm * (invert ? -1 : 1)` into that vertex's running total via the layer's
+   `TextureBlendMode` (see Blend modes). A `visited` set makes each layer fold in exactly **once**
+   per vertex, no matter how many of the patch's triangles share it - otherwise a Multiply/Subtract
+   layer would apply two or three times over depending on local triangle fan-out.
+6. Finally, move each touched vertex along its (step 2) normal by its accumulated total.
+
+### Blend modes
+
+`TextureBlendMode` {Add, Subtract, Multiply, Divide}, per layer, applied per vertex against the
+total accumulated by the layers **below** it (lower slots). The quantity blended is a signed
+displacement in **mm**, not a pixel value.
+
+Add/Subtract are self-explanatory. Multiply/Divide are *scaling* operations and so need a unit
+convention: they treat the layer's own value as a **factor relative to 1 mm**. That makes `depth_mm`
+a gain, and - the property that makes a Multiply layer usable as a mask - a layer with depth 1 mm
+sampling a white (1.0) texel multiplies by exactly 1, i.e. leaves the layers below unchanged.
+Divide floors its divisor's magnitude at 0.05 - a black texel samples to *exactly* zero, so the
+divisor really does hit zero in ordinary use, and an unbounded `1/0` would fling vertices thousands
+of mm away and poison the mesh's bounding box (and every plate/print-volume check downstream). The
+floor doubles as a cap on how far Divide can amplify the relief beneath it: at most 20×.
+
+The **lowest painted layer ignores its blend mode**: it has nothing beneath it, and Multiply/Divide
+against an implicit zero base would annihilate (or blow up) it. Enforced in `build_texture_
+displacement()` (the first layer to reach a given vertex always folds in additively) and surfaced in
+the UI, which labels that layer "Base layer" instead of offering a control that silently does nothing.
+
+### Projection methods
+
+Four choices per layer (`TextureProjectionMethod`), all funneling through `apply_uv_transform()`
+(scale by `1/tiling_scale`, rotate by `rotation_deg`, add `offset`). They are dispatched by
+`sample_layer_height()`, which returns a **height**, not a UV - because Triplanar takes three
+texture samples per vertex and so has no single UV that represents it.
+
+- **Triplanar** (default) - samples the texture on all three world planes (`(y,z)`, `(x,z)`, `(x,y)`)
+  and blends the three by the vertex's own normal raised to `TRIPLANAR_BLEND_SHARPNESS` (4).
+  This is the fix for a real, user-reported bug. The previous version *hard-picked* the single axis
+  most aligned with the normal, which is discontinuous wherever that dominant axis flips: on a +X
+  face the planar coordinate is `(y, z)`, on a −Y face it is `(x, z)`, so at the shared edge `u`
+  jumps from `y_edge` to `x_edge`. On a box centred near the origin those two happen to **agree** at
+  the (+,+) and (−,−) corners and **differ by the full corner width** at the (+,−) and (−,+) corners
+  - which is exactly the "two bad corners, two good ones" symmetry that was observed. A weighted
+  blend is continuous across the transition by construction, since the weight of the axis being left
+  behind falls smoothly to zero. (Note this removes the hard *seam*; some cross-fade blurring in the
+  band right at a 90° edge is inherent to triplanar mapping. A genuinely seam-free wrap around a box
+  needs a real unwrap - that is what the LSCM mode is for.)
+- **Cylindrical** - wraps around an axis through the patch centroid, axis auto-picked as the world
+  axis *least* aligned with the average normal (perpendicular to the outward radial normal, as a
+  cylinder's own axis would be). `u = angle * local_radius` (arc length in mm), `v = distance along
+  axis`. Approximation, not an exact fit for arbitrary geometry.
+- **Spherical** - longitude/latitude around the centroid, scaled by local radius. Same caveat.
+- **LSCM** - real UV unwrap via `MeshBoolean::cgal::parameterize_lscm()` (CGAL's
+  `Surface_mesh_parameterization` package, LSCM algorithm). Computed **once per patch** (not
+  per-vertex like the others - it's a single global least-squares solve), then each vertex looks up
+  its precomputed UV. Requires the patch to be a single topological disk (one connected component,
+  one boundary loop) - `compute_lscm_uvs()` returns empty and the layer silently falls back to
+  Triplanar if not (e.g. multiple disconnected painted islands, or a fully closed patch).
+  CGAL's parameterizer needs a mesh with no isolated/unreferenced vertices, but `get_facets_strict()`
+  returns the *whole* mesh's vertex array - so there's a compaction step
+  (`compact_patch_with_map()`) that builds a clean sub-mesh + an index map back to the original
+  (uncompacted) vertex numbering, purely local to this file.
+- **ViewProjected** ("From view") - a flat projection along a fixed direction captured from the 3D
+  camera, like a slide projector. `capture_view_projection()` takes the camera's right/up axes,
+  transforms them into the volume's *local* frame (so the projection rides along if the part is later
+  moved), and stores them as `TextureDisplacementLayer::view_project_right/up` (unit vectors, so the
+  projected coordinate stays in mm and `tiling_scale` keeps meaning mm). `sample_layer_height()`
+  projects `Vec2f(dot(pos, right), dot(pos, up))`. Single-valued per point, so - like LSCM but unlike
+  blended Triplanar - the fast preview and UV-check overlay precompute it per vertex
+  (`compute_layer_vertex_uvs()`) and drive the shader's `use_vertex_uv` path. Faces angled away from
+  the projector smear; that is inherent to view projection, not a bug.
+
+  Two companions to this mode:
+  - **Projection frame overlay** (`TextureProjectorFrame`, see below) - a semi-transparent window
+    dragged over the 3D view whose border becomes the projection's edge. Applying it stores an exact
+    **projective** map in `view_project_matrix`, which supersedes the affine `right`/`up` axes above
+    for that layer (`view_project_projective`).
+  - **"Project only on visible"** (`select_visible_faces()`) - repaints the layer with exactly the
+    facets the camera can see, so the projected area matches the viewpoint the projector was captured
+    from. Two tests: a facing test (normal vs. view direction, per triangle - under perspective the
+    view direction varies across the model, so it is taken from the eye to each centroid), then
+    `MeshRaycaster::get_unobscured_idxs()` on the survivors to drop facets hidden behind other
+    geometry, so a concave part's far inner wall is correctly excluded. One ray query per front-facing
+    facet, hence click-driven (on the checkbox and on each "Capture current view"), never per frame.
+    It **replaces** the layer's paint rather than adding to it - "project onto what I can see" would
+    otherwise accumulate every angle the user had ever looked from.
+
+### Manual seams and island cutting
+
+`TextureDisplacementLayer::lscm_seam_edges` - undirected mesh-vertex-index edge pairs the unwrap is
+forced to cut along, on top of the dihedral-angle seams. `segment_into_charts()` takes a set of these
+(translated from mesh → compacted-patch numbering inside `compute_patch_unwrap()`) and refuses to
+union two triangles across a marked edge whatever their angle. Both the unwrap cache key and the
+gizmo's `UVEditorState` include the seam list, so marking a seam (which leaves the paint mask
+untouched) still forces a re-solve. Like the paint masks, seams are mesh-index-space and so dropped on
+any topology change.
+
+Two ways to write to it:
+- **Mark seam (manual, #9)** - a "Mark seams" click mode (`m_seam_edit_mode`) that suppresses
+  painting. A click raycasts the volume (`m_c->raycaster()->raycasters()[idx]->unproject_on_mesh()`,
+  `idx` = the volume's slot among model-part volumes), finds the facet's edge nearest the hit point,
+  and toggles it. Marked edges render as a red overlay (`render_seam_overlay()`), pulled toward the
+  camera so they read on top. This is the Blender mark-seam workflow.
+- **Cut island (auto, #17)** - `cut_island()` takes the selected chart's triangles (back-mapped from
+  the unwrap via `source_vertex`), finds their 3D bounding box, and marks every edge that straddles
+  the mid-plane perpendicular to the longest axis. The re-unwrap then splits the chart across its
+  narrow waist - the "islands might be very long" case. Exposed as the UV pane's **Cut** button.
+
+### UV-check overlays (checker / distortion)
+
+`resources/shaders/{110,140}/texture_displacement_uvcheck.{vs,fs}`, one shader with a `mode` uniform,
+drawn over the painted patch (`rebuild_uvcheck_mesh()`/`render_uvcheck_mesh()`, P3N3T2: `normal.x` =
+distortion, `tex_coord` = uv), pulled forward with a polygon offset. **Checker** (#13) samples a
+procedural checkerboard at the layer's uv (per-vertex for LSCM/ViewProjected, in-shader triplanar
+otherwise) - squares that stay square mean low distortion. **Distortion** (#14) colours each triangle
+blue→green→red by `log2(uv_area / surface_area)` centred on the patch's *median* stretch (so a
+globally-scaled unwrap reads as uniformly ideal and only relative stretch shows), averaged to
+vertices. A separate **Show mesh wireframe** toggle (#8) draws the whole volume's triangle edges,
+rebuilt only when the vertex count changes (not per stroke).
+
+### Tiling
+
+`DecodedHeightTexture::sample(uv, tile_enabled, tile_method)`. Two tile methods when enabled
+(Repeat, MirroredRepeat). **When `tile_enabled` is false, sampling outside `[0,1)` returns `0`
+directly** - clamping the *coordinate* into range (what an earlier version did) instead smears the
+border row/column of pixels outward to infinity in every direction, which is a real bug that was
+reported and fixed (visually: streaky lines radiating out from the painted patch).
+
+### Subdivision (`subdivide_mesh_uniform()`)
+
+Deliberately **whole-mesh and uniform**, not limited to the painted patch. A patch-only /
+adaptive subdivision would create a classic T-junction/cracking problem where the denser
+(subdivided) and sparser (untouched) regions meet - the fine side has edge midpoints the coarse
+side doesn't know about, producing a real (non-manifold-looking) crack in the baked geometry. This
+was consciously scoped down from the original plan's "adaptive per-patch subdivider" idea to avoid
+that correctness risk (a subtly-cracked mesh is a much worse outcome than "not implemented yet").
+Algorithm: recursive 1-to-4 triangle split via edge midpoints, with a shared per-pass midpoint cache
+(keyed by sorted vertex-index pair) so triangles sharing an edge get the *same* new vertex - capped
+at `max_iterations` (default 6) passes to bound worst-case triangle-count explosion.
+
+Wired as a "Subdivide steps" slider (**0–5**, where 0 means no subdivision and previews nothing) plus
+Preview/Apply/Done in the gizmo panel. **Apply snaps the slider back to 0**. A real, committed geometry change (like
+Bake), using the same `save_painting()`/`set_mesh()`/`restore_painting()` dance `GLGizmoSimplify`
+uses: supported/seam/mmu/fuzzy-skin masks get remapped onto the new triangles, texture-displacement
+paint does not (no remap support yet) and is dropped rather than left pointing at now-meaningless
+triangle indices.
+
+### Fast bump preview (GPU-only, no CPU meshing)
+
+`resources/shaders/{110,140}/texture_displacement_bump.{vs,fs}`, registered as
+`"texture_displacement_bump"`. Perturbs the *shading* normal from the height texture's local
+gradient instead of moving geometry - active-layer-only, toggled via a "Fast preview (normal map)"
+checkbox. Vertex format is `GLModel::Geometry::EVertexLayout::P3N3T2`: `normal.x` carries the
+per-vertex paint weight (0/1) and `tex_coord` carries a precomputed texture UV, so it can use
+`GLModel` normally instead of needing a hand-rolled VBO/VAO manager. Weight buffer is
+rebuilt at the same cadence as the true-displacement preview (stroke-end/slider-release), using the
+**live** `TriangleSelector` state (not the flushed model facets), so it doesn't lag by a full model
+round-trip.
+
+The perturbed normal is the analytic one for a height field `H = ±depth_mm · h(uv)` displaced along
+`N` over any orthonormal surface tangent pair `T`/`B`:
+
+    N' = normalize(N − (dH/da)·T − (dH/db)·B),   a = dot(p,T), b = dot(p,B)
+
+The two slopes have to be genuine **mm-per-mm** derivatives for the preview's apparent depth to
+match the bake's - see bug #13.
+
+**Two projection paths (`use_vertex_uv` uniform):**
+- **Triplanar (`use_vertex_uv = 0`)** - `uv` and the `T`/`B` axes are both derived in-shader from
+  the dominant normal component, mirroring `project_planar()`/`apply_uv_transform()`, and the slope is
+  formed analytically. `T`/`B` are the projection's axis-aligned pair, exact only when the face is
+  axis-aligned; the shader drops the along-normal component to keep the gradient in the surface. Here
+  one `uv` unit is exactly `tiling_scale` mm, so the `1/tiling_scale` gradient factor is right.
+- **Precomputed UV (`use_vertex_uv = 1`, used for LSCM)** - `uv` comes per-vertex from the CPU
+  (`compute_lscm_uvs(patch, layer)`, so island placement + tiling/rotation/offset are already folded
+  in), and the perturbed normal is built with **Mikkelsen's method** ("Bump Mapping Unparametrized
+  Surfaces on the GPU"): the surface gradient taken directly from the screen-space derivatives of the
+  *sampled height* and position. **This makes no uv→mm scale assumption**, which is essential -
+  the first cut used the same global `1/tiling_scale` factor as triplanar and the depth came out
+  visibly wrong, because an LSCM map is **conformal, not isometric**: it is globally area-scaled but
+  the *local* mm-per-uv varies across the chart. `dFdx(h)` captures the true on-screen rate of change
+  however the chart is stretched. **This path is also what makes the fast preview follow the UV
+  editor: move an island and its uv - hence its bump - moves with it** (the bump mesh rebuilds on
+  drag-end, since `on_island_edited(finished)` → `rebuild_preview()` → `rebuild_bump_preview_mesh()`).
+  The branch is uniform (`use_vertex_uv` is a uniform) and the paint weight gates by multiply, so the
+  texture derivatives stay well defined. A triangle straddling a seam has a discontinuous uv → the
+  `det≈0` guard skips it (a localised preview-only artifact, never in the bake).
+
+Remaining deliberate approximation: the GPU sampler's wrap mode stands in for
+`tile_enabled`/`tile_method`, so with tiling *off* the GPU repeats where the CPU returns 0 outside
+`[0,1)`.
+
+### On-canvas "Adjust Texture" gizmo
+
+A per-active-layer toggle ("Adjust placement (drag on model)") that disables painting and shows a
+flat pan panel (free 2D drag on both axes) plus two arrows along the patch's own U/V axes
+(constrained single-axis drag). Anchored to the painted patch's centroid/average-normal
+(`compute_layer_paint_anchor()`). Hit-testing is screen-space distance/point-to-segment (not real
+3D ray intersection against the handle geometry) - simple and good enough at this handle size.
+
+### Projection frame overlay (ViewProjected)
+
+`src/slic3r/GUI/TextureProjectorFrame.hpp/.cpp` - a semi-transparent, resizable `wxFrame` the user
+drags **over the 3D view**, like a slide projector's gate. Whatever the model shows through it is what
+the texture is projected onto, and the window's border becomes the hard edge of the displacement.
+Press **Apply projection frame** and the gizmo reads the window's rectangle and commits it.
+
+The window is deliberately **dumb**: it owns no placement state and reports nothing continuously. Its
+position and size *are* the placement, read on demand at Apply - which is also when the expensive
+visible-facet raycast runs. So dragging it is free and nothing recomputes until asked.
+
+Plain 2D (`wxPaintDC`), not a `wxGLCanvas`: a second GL canvas would have to share the app's one real
+`wxGLContext`, the cause of bugs #10 and #14 below. It only ever draws a bitmap and a border.
+
+**The projective mapping (`apply_projection_frame()`)**. The frame defines a
+**screen-space** rectangle, but the bake samples from a **local-space** position, so the two have to be
+reconciled. `view_project_right/up` can only express an *affine* projection - exact under an
+orthographic camera, but wrong under perspective, where the near end of a part projects larger than the
+far end and no pair of axes reproduces that. So the layer instead stores a full projective map
+(`view_project_matrix`, row-major 3×4, `uv = (row0·p̃/row2·p̃, row1·p̃/row2·p̃)`), built like this:
+
+- `K = projection · view · (instance · volume)`, i.e. local → clip, the same product the renderer uses.
+  Note `Camera::get_projection_matrix()` is typed `Transform3d` (nominally affine) but its perspective
+  form explicitly writes a `(0, 0, −1, 0)` bottom row into the underlying 4×4, so `clip.w = −z_eye` is
+  genuinely carried. The build therefore multiplies **`.matrix()` products** (plain `Matrix4d`), never
+  `Transform3d` products, which would not compose that row correctly.
+- Window coordinates follow `igl::project`'s convention (as `CameraUtils::project` does), with y
+  measured downward. Writing `uv = (win − rect_origin) / rect_size` makes u and v affine in
+  `ndc = clip.xyz / clip.w`; multiplying through by `clip.w` leaves a plain linear combination of `K`'s
+  rows, which is exactly the 3×4 matrix - the perspective divide survives intact.
+- `w > 0` is checked rather than divided blindly. A point behind the projector has `w < 0` and divides
+  to a plausible-looking but **mirrored** uv - the classic way a projected decal reappears on the back
+  of a model. `project_uv_projective()` returns false there and the caller treats it as no height.
+
+The map already includes placement, so `apply_uv_transform()` is **not** applied on top of it - the
+window's own position and size are the placement, and the tiling/rotation/offset sliders would shove
+the result off the frame the user just aligned. A "Clear" button drops back to the affine path where
+those controls mean something again.
+
+Apply also sets `tile_enabled = false`, so `DecodedHeightTexture::sample()` returns 0 outside `[0,1)`
+and the border is a hard edge rather than the first seam of an endless repeat, and repaints the layer
+via `select_visible_faces(&matrix)` - the frame's uv square clips the selection, which both matches the
+paint to the border and keeps the ray queries proportional to the framed area instead of the model.
+
+Owned by the gizmo and **destroyed** (not just hidden) in `on_shutdown()`. Closing it only hides it, so
+reopening keeps it where it was left.
+
+### UV Editor pane
+
+`UVEditorCanvas` (`src/slic3r/GUI/UVEditorCanvas.hpp/.cpp`) - a standalone `wxGLCanvas` rendering the
+flattened LSCM islands (per-island wireframe + outline + fill) over the height texture (background
+quad tiled across the whole unwrap), with mouse pan/zoom. It is wrapped in a **`UVEditorPanel`**
+(same file) that adds a button row (Frame / Snap / Average scale) and a status line
+along the bottom naming the current gesture and the shortcuts in play. The *panel* is what is
+registered as a `wxAuiPaneInfo` pane on `Plater`'s `m_aui_mgr`; `Plater::show_uv_editor(bool)`
+shows/hides it (deferred via `CallAfter`, since the gizmo calls it mid-3D-frame), and
+`get_uv_editor_canvas()` returns the inner canvas the gizmo talks to.
+
+Deliberately **shares the app's one real `wxGLContext`** (`wxGetApp().init_glcontext(*this)`, the
+same call `View3D`/`Preview`/`AssembleView` make) rather than creating an independent context like
+`SkipPartCanvas` does elsewhere in this codebase - this is what lets it reuse the already-registered
+`"flat"`/`"flat_texture"` shaders and `GLModel` as-is, instead of needing its own shader
+compilation/VBO management.
+
+**Geometry is uploaded once, in the unwrap's own (raw, mm) coordinates**, one `GLModel` set per
+island; each island is then drawn through its own 2x3 affine (`island_transform_matrix()` composed
+with the layer's tiling/rotation/offset) passed as the `flat` shader's `view_model_matrix`. A 
+drag updates one matrix per island and touches no vertex
+buffer - `on_island_edited(!finished)` calls only `set_island_transforms()`, and the full
+`set_islands()` rebuild happens solely when the unwrap itself changes (`unwrap_changed` in
+`update_uv_editor()`).
+
+**Gestures** (canvas-owned, reported to the gizmo as incremental deltas via `IslandEditFn`): left-drag
+= move, right-drag or **R** = rotate (hold **Shift** to snap to 15° steps - quantised on the
+*cumulative* rotation, not each delta, so it doesn't judder, and accumulated incrementally so it
+survives crossing ±180°), **S** = scale (R/S modal, click/Enter to confirm, Esc to cancel), wheel =
+zoom about the cursor, middle-drag = pan, **Home**/**F** = frame all. Scale writes
+`TextureIsland::scale`; "Average scale" (`average_island_scales()`) sets every island to the mean, so
+one island scaled by hand can be matched back to its neighbours' texel density. **Snap** (canvas-owned
+`m_snap_enabled`, toggled from the toolbar) sticks a dragged island's nearest boundary vertex onto a
+neighbouring island's at drag-*end* only - a magnet that re-applies mid-drag is very hard to pull out
+of. Toolbar commands the canvas can't service itself (Average scale) are forwarded to the gizmo via
+`CommandFn`; view-only ones (Frame, Snap) it handles directly.
+
+## Known limitations / deferred work
+
+- **No `.3mf` serialization** for texture-displacement paint data or texture assets. A background
+  agent attempted this in an earlier session, hit its own usage limit mid-edit, and left
+  `bbs_3mf.cpp` with an undefined forward-declared function; that partial edit was reverted rather
+  than shipped broken. Practical impact: **baked** geometry round-trips fine (it's just an ordinary
+  part of the mesh via the existing mesh serialization path) - what does *not* survive a project
+  save/reload is any *unbaked* paint stroke and texture layer definition.
+- **No remap-across-topology-change** for texture-displacement paint (`ModelObject::split()`, mesh
+  boolean ops, Simplify, and now `subdivide_mesh_uniform()` all drop it via `reset_extra_facets()`).
+  The other four paint channels (supported/seam/mmu/fuzzy) do get remapped in these cases.
+- **Cylindrical/Spherical axis/center are auto-picked heuristically**, not user-controllable - no
+  UI to override the auto-detected wrap axis if it picks the "wrong" one for an odd shape.
+- **Fast preview covers the active layer only**
+- **Displacement resolution is capped by the mesh's own vertex density.** Baking only ever *moves*
+  existing vertices (it never inserts any), so a coarse patch cannot show fine texture detail no
+  matter how high-resolution the height map is - that is what the "Subdivide model" button is for.
+  Since the rewrite the bake is topology-preserving, so this is now a hard, explicit property rather
+  than something partly papered over by the old per-layer re-meshing.
+
+## File map
+
+**libslic3r (core, no GUI dependency):**
+- `src/libslic3r/TextureDisplacement.hpp/.cpp` - data model, bake algorithm, projection methods,
+  tiling, subdivision. See doc comments throughout, they're kept accurate and up to date.
+- `src/libslic3r/MeshBoolean.hpp/.cpp` - added `parameterize_lscm()` and `remesh_isotropic()`
+  in the `cgal` sub-namespace,
+  reusing the existing `CGALMesh`/`_EpicMesh`/conversion-helper infrastructure already there for
+  mesh boolean ops. New CGAL includes: `Polygon_mesh_processing/border.h`,
+  `Polygon_mesh_processing/connected_components.h`, `Surface_mesh_parameterization/{Error_code,
+  LSCM_parameterizer_3, parameterize}.h`. No new dependency - CGAL 5.6.3 is already vendored and
+  the `Surface_mesh_parameterization` package headers were already present, just unused before now.
+- `src/libslic3r/Model.hpp/.cpp` - the 8 named `FacetsAnnotation` fields + accessor,
+  `texture_displacement_layers`, and all the mirrored touch points (see Data model above).
+
+**GUI:**
+- `src/slic3r/GUI/Gizmos/GLGizmoTextureDisplacement.hpp/.cpp` - the gizmo. Panel controls: dock/
+  undock toggle, brush/face/connected-area selection mode + "select whole model" button, per-layer
+  texture picker + depth/tiling/rotation/invert/tile-mode/projection-mode/blend-mode controls,
+  "Adjust placement" toggle (on-canvas gizmo), "Fast preview (normal map)" toggle, "Subdivide model"
+  button, Add layer/Erase all/Bake.
+- `src/slic3r/GUI/TextureLibrary.hpp/.cpp` - scans the shipped + user texture folders, imports an
+  arbitrary image into the user folder (converting it to the 8-bit grayscale PNG libslic3r decodes),
+  and loads a library file's bytes for a layer. The image→grayscale-PNG conversion lives here, on the
+  GUI side, because libslic3r has no image toolkit; both the import path and the "pick a shipped
+  texture" path go through the same one function.
+- `resources/textures/displacement/*.png` - the 10 shipped height maps (Bricks, Grid, Hexagons,
+  Knurl, Noise, Quilt, Studs, Waves, Weave, Wood Grain). All 512×512 8-bit grayscale and **seamless**
+  (each is periodic over the full image in both axes, so tiling shows no seam). Generated
+  procedurally; the whole `resources/` tree is installed recursively by CMake, so a new folder under
+  it ships with no build-system change.
+- `src/slic3r/GUI/Jobs/TextureDisplacementBakeJob.hpp/.cpp` - background bake commit.
+- `src/slic3r/GUI/Jobs/TextureDisplacementPreviewJob.hpp/.cpp` - background preview compute
+  (mirrors the bake job's shape but commits nothing to the Model).
+- `src/slic3r/GUI/TextureProjectorFrame.hpp/.cpp` - the semi-transparent projection-frame overlay for
+  ViewProjected layers (plain 2D `wxPaintDC`, no GL context - see its section above).
+- `src/slic3r/GUI/UVEditorCanvas.hpp/.cpp` - the 2D UV unwrap viewer widget.
+- `src/slic3r/GUI/Plater.hpp/.cpp` - `uv_editor_canvas` member, AUI pane registration,
+  `get_uv_editor_canvas()`/`show_uv_editor()`.
+- `src/slic3r/GUI/GLShadersManager.cpp` - registers `"texture_displacement_bump"`.
+- `resources/shaders/{110,140}/texture_displacement_bump.{vs,fs}` - the bump-preview shader.
+- `src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp` - `PainterGizmoType::TEXTURE_DISPLACEMENT`.
+- `src/slic3r/GUI/Gizmos/GLGizmosManager.hpp/.cpp` - `EType::TextureDisplacement` registration.
+- `src/slic3r/GUI/ImGuiWrapper.cpp` - the light-mode checkmark-color fix
+
+**Tests:** `tests/libslic3r/test_texture_displacement.cpp` - **run and passing** (7 cases, 116
+assertions). Covers `decode_height_texture` round-trip, empty-layer no-op, full-cube uniform
+displacement, boundary-vertex pinning on a hand-built fan mesh, and - added with the bake rewrite -
+a regression test that a **second layer over the same area actually contributes**, 
+a table-driven check of all four blend modes, and that the lowest layer ignores its
+blend mode. `BUILD_TESTS` is `OFF` in the checked-in build cache; flip it on to run them:
+
+    cmake -S . -B build -DBUILD_TESTS=ON
+    cmake --build build --config Release --target libslic3r_tests -- -m
+    ./build/tests/libslic3r/Release/libslic3r_tests.exe "[TextureDisplacement]" --order rand

TEXTURE_DISPLACEMENT_GUIDE.md

@@ -0,0 +1,326 @@
+# Texture Displacement — Feature & Controls Guide
+
+Texture Displacement is a paint-style gizmo that stamps height-map textures onto a model's surface
+and turns them into real relief — engraved or embossed detail — either as a live preview or baked
+into actual mesh geometry. You paint where the texture applies, stack multiple textures as blended
+layers, choose how each is projected onto the surface, and (for the unwrap projection) lay the result
+out by hand in a dedicated 2D **UV Editor** pane.
+
+This document describes every feature and control. For the internal architecture and algorithms, see
+`TEXTURE_DISPLACEMENT.md`.
+
+---
+
+## Table of contents
+
+1. [Quick start](#quick-start)
+2. [Entering the tool](#entering-the-tool)
+3. [Selection modes](#selection-modes)
+4. [View modes](#view-modes)
+5. [Auto update](#auto-update)
+6. [Texture layers](#texture-layers)
+7. [Per-layer settings](#per-layer-settings)
+8. [Projection methods](#projection-methods)
+9. [The UV Editor](#the-uv-editor)
+10. [Seams](#seams)
+11. [Adjust placement (on-model)](#adjust-placement-on-model)
+12. [Preparing the mesh: Subdivide & Remesh](#preparing-the-mesh-subdivide--remesh)
+13. [Baking & resetting](#baking--resetting)
+14. [Controls reference](#controls-reference)
+15. [Tips & limitations](#tips--limitations)
+
+---
+
+## Quick start
+
+1. Select an object and open the **Texture displacement** gizmo from the left toolbar.
+2. A texture layer is added automatically. Pick a texture from the layer's picker, or import your own.
+3. **Paint** the area you want the texture to affect (or press **Select whole model**).
+4. The relief appears live on the model. Tune **Depth**, **Tile size**, **Rotation**, etc.
+5. If the model is low-poly, use **Subdivide** or **Remesh** so there are enough vertices for detail.
+6. Press **Bake** to convert the preview into real geometry, or leave it as a live preview.
+
+> The tool only ever affects the **painted** area. Everything you don't paint keeps its original
+> surface, and bake blends the relief seamlessly into it.
+
+---
+
+## Entering the tool
+
+The gizmo lives on the left gizmo toolbar (icon: `toolbar_texture_displacement.svg`). Its settings
+panel opens beside the toolbar. You can **Dock panel / Undock panel** (top of the panel) to pin it or
+float it freely over the 3D view, and **Close** at the bottom exits the gizmo.
+
+When you first open the tool on a never-textured object it starts with **one texture layer already
+added**, so you can paint straight away.
+
+---
+
+## Selection modes
+
+Choose *how* you paint. All three write into the **active layer's** mask.
+
+| Mode | What it does |
+|------|--------------|
+| **Brush** | Free-hand painting with a round brush. Shows a **Brush size** slider and a **Circle / Sphere** choice (circle = surface disc, sphere = 3D ball that also paints around curves). |
+| **Face** | Click a single triangle to paint it. |
+| **Connected area** | Click to flood-fill a region; the **Angle threshold** slider limits how far the fill spreads across changes in surface angle. |
+
+- **Select whole model** — marks the entire model as painted for the active layer, instead of
+  brushing it by hand.
+
+---
+
+## View modes
+
+A row of icon buttons labelled **View** controls how the painted area is shown. The first four are a
+radio group; **Wireframe** is an independent toggle. Hover any icon for its tooltip.
+
+| View | Meaning |
+|------|---------|
+| **Normal** | The true displaced geometry — exactly what **Bake** produces. Rebuilt in the background. |
+| **Fast** | A GPU bump-shaded approximation of the *active layer only*. No real geometry movement — quick to update, not exact. Best while tuning or dragging islands. |
+| **Checker** | A test grid painted over the unwrap so you can see stretching (squares stay square where the map isn't distorted). |
+| **Distortion** | A blue→green→red heatmap of how much each area is compressed or stretched in UV space. Needs the **Unwrap (LSCM)** projection. |
+| **Wireframe** | Overlays the mesh edges (white). Independent of the view above; in **Normal** view it sits on the displaced surface. |
+
+---
+
+## Auto update
+
+**Auto update** (on by default) rebuilds the true displaced geometry as soon as *anything* changes —
+painting, swapping textures, moving sliders. Turn it off on very heavy models to only rebuild when you
+release a slider (painting still updates on stroke end).
+
+---
+
+## Texture layers
+
+You can stack up to **8** texture layers. Each has its own independent paint mask, its own texture,
+and its own parameters, and they combine in slot order like layers in an image editor.
+
+- **Add a layer** — the **＋ icon** to the right of the *Texture layers* heading (reuses the tool icon
+  for now).
+- **Remove** — the button on each layer's header row.
+- **Active layer** — click a layer's header (or anywhere in its block) to make it active. The active
+  layer is the one you paint into and the one whose block is tinted. Only one layer is active at a time.
+- **Erase all** — clears the active layer's paint.
+
+Each layer shows a texture **picker** (large preview + name). Open it to choose from the shipped
+library or import your own image (any png/jpg/bmp; it's converted to an 8-bit grayscale height map and
+copied into your user texture folder so app updates can't overwrite it).
+
+---
+
+## Per-layer settings
+
+| Control | Range / options | What it does |
+|---------|-----------------|--------------|
+| **Depth (mm)** | 0.01–10 (log) | Maximum displacement along the surface normal. |
+| **Tile size (mm)** | 0.2–200 (log) | Physical size of one texture tile on the surface. |
+| **Rotation** | 0–360° | Rotates the texture on the surface. |
+| **Midlevel** | 0–10 | The grey level that means "don't move". At 0 the texture only pushes outward; raise it and darker texels cut *inward* (one map both embosses and engraves). 0.5 makes mid-grey neutral. |
+| **Smoothing** | 0–1 | Blurs the height texture before it displaces — rounds hard edges and removes speckle without needing a softer source image. |
+| **Edge smoothing** | checkbox + **Edge amount** 0–1 | Fades the relief to flat toward the *edge of the painted area*, so it blends into the surrounding surface. A small amount softens only a thin band at the very edge; the maximum flattens the whole painted face. |
+| **Invert** | checkbox | Flips the height map (peaks become valleys). |
+| **Blend** | Add / Subtract / Multiply / Divide | How this layer combines with the layers **below** it where they overlap. Add/Subtract pile relief on or carve it away; Multiply/Divide scale the relief underneath (a mask). The lowest painted layer is the **Base** and always behaves additively. |
+| **Tile** | checkbox + **Repeat / Mirrored repeat** | When off, the texture is placed once (a decal) instead of repeating. Mirrored repeat flips every other tile to hide seams. |
+| **Projection** | see below | How the texture is mapped onto the painted surface. |
+
+> **Midlevel warning:** cutting inward can fold the surface through itself in sharp concave corners or
+> thin walls. Keep Depth small relative to the feature you're cutting into; the panel warns when a deep
+> inward setting is risky.
+
+---
+
+## Projection methods
+
+How the 2D texture is wrapped onto the 3D painted area.
+
+| Method | Best for | Notes |
+|--------|----------|-------|
+| **Triplanar (blended)** | Patches wrapping around edges | Projects from all three axes at once and blends, so there's no seam across a sharp edge. |
+| **Cylindrical** | Round, tube-like selections | Wraps the texture around the patch's own centre/axis. |
+| **Spherical** | Ball-like selections | Longitude/latitude wrap around the patch centre. |
+| **Unwrap (LSCM)** | Flat, controlled layout | A real conformal unwrap. Cuts the area into pieces at sharp edges (see **Seam angle**), flattens each, and lets you lay them out by hand in the **UV Editor**. Unlocks Checker/Distortion, seams, and island editing. |
+| **From view** | Decals / slide-projector look | Projects straight onto the surface from the current camera direction. Use **Capture current view** to re-lay it from wherever you're looking. |
+
+### LSCM-only controls
+
+These appear when a layer uses **Unwrap (LSCM)**:
+
+- **Seam angle** (5–90°) — edges sharper than this are cut so each piece lies flat. Lower cuts more
+  (less stretching, more seams); raise to keep more in one piece. A box's 90° corners are cut by
+  default. *Ignored once you've marked any seam by hand* (your seams then define the pieces).
+- **Connect islands** (on by default) — lays the unwrap out as a **connected net**: pieces that share
+  an edge are unfolded next to each other (a cube becomes a joined net instead of six loose squares).
+  They stay separate islands, so you can still move any of them by hand. Turn off for the classic
+  packed-grid layout.
+- **Open UV editor** — shows the flattened unwrap in a side pane (see below). Opens *only* when you
+  turn this on — it never pops up on its own.
+- **Mark seams** / **Path** / **Clear seams** — see [Seams](#seams).
+- An **Unwrap: N islands, F faces, V verts** read-out tells you what the unwrap actually produced.
+
+---
+
+## The UV Editor
+
+A dockable 2D pane (enable **Open UV editor** on an LSCM layer) showing the flattened unwrap over the
+height texture. Islands are the flattened pieces; you can rearrange them freely — nothing re-packs them
+behind your back. Moving an island updates the model **live** (in Fast view it tracks the cursor
+smoothly, via a shader uniform — no rebuild until you release).
+
+### Navigation
+
+| Action | Control |
+|--------|---------|
+| Pan | Middle-drag |
+| Zoom | Mouse wheel (zooms about the cursor) |
+| Frame everything | **Home** or **F**, or the **Frame** toolbar button |
+
+### Editing an island
+
+| Action | Control |
+|--------|---------|
+| Select | Left-click an island |
+| Move | Left-drag |
+| Rotate | Right-drag, or press **R** then move the mouse (click/Enter to confirm, Esc to cancel) |
+| Rotate snapped | Hold **Shift** while rotating — snaps to **global** 15° marks (0/15/30…). A protractor dial with tick marks and the current angle is shown. |
+| Scale | Press **S** then move the mouse (click/Enter to confirm, Esc to cancel) |
+| Undo / Redo | **Ctrl+Z** / **Ctrl+Shift+Z** or **Ctrl+Y** |
+
+The **selected** island gets a bold light-green outline and a brighter wireframe; unselected islands
+are a translucent light-green wash. The texture underneath repeats exactly as it will when baked.
+A **status line** along the bottom always names the current gesture and the shortcuts in play.
+
+### Toolbar
+
+| Button | Action |
+|--------|--------|
+| **Frame** | Frame all islands (same as Home). |
+| **Snap** | Toggle magnetic snapping — a dragged island sticks its boundary to a neighbour's when they come close. |
+| **Avg scale** | Give every island the same texel density (Blender's "Average Islands Scale"). |
+| **Cut** | Split the selected island across its long axis (useful for very long islands). |
+| **Join** | Unfold the selected island onto its nearest neighbour along their shared edge — keeps both as separate islands with their own borders. |
+| **Unjoin** | Send the selected island back to its own packed position. |
+
+> **Checker / Distortion in the UV editor:** selecting those View modes also colours the UV pane — a
+> checker background, or a per-island distortion heatmap — so you can judge stretch in 2D as well as
+> on the model.
+
+---
+
+## Seams
+
+Seams are edges the unwrap is forced to cut along, on top of whatever the Seam angle cuts — the
+Blender "mark seam" workflow. They let you control exactly where the unwrap splits.
+
+Enable **Mark seams** on an active LSCM layer, then:
+
+- **Click an edge** on the model to mark it (it turns **red**); click a red edge again to unmark it.
+  The edge under the cursor is highlighted **yellow** so you can see what a click will toggle.
+- **Path mode** (the **Path** checkbox) — for dense meshes where clicking each edge is tedious: click a
+  start point, then an end point, and the whole **shortest path** between them is seamed at once. It
+  chains (each click extends from the last point); the start vertex is shown in **green**.
+- **Ctrl+drag** rotates/pans the camera while in seam mode.
+- **Clear seams** removes them all.
+
+Once any seam is marked, the automatic Seam-angle cutting is disabled so *your* seams define the
+islands — pieces you leave un-seamed merge together.
+
+---
+
+## Adjust placement (on-model)
+
+**Adjust placement** (on an active layer) lets you position the texture by dragging a handle on the
+model instead of nudging the Rotation/offset numbers. The handle is a flat panel in the patch's
+tangent plane (drag anywhere on it to move freely) plus U/V arrows for single-axis nudges. It's
+anchored to the painted patch, so paint something first.
+
+---
+
+## Preparing the mesh: Subdivide & Remesh
+
+Displacement can only move vertices that exist, so a coarse model needs more of them first.
+
+### Subdivide
+
+Splits every triangle into four, **1–5 times** (each step roughly quadruples the triangle count).
+
+- **Subdivide steps** (1–5) — how many times to split.
+- **Preview subdivision** — shows the result as a **cyan wireframe** without changing the model.
+- **Apply** — commits the subdivision to the geometry.
+- **Done** — ends the preview and leaves the model as it is.
+
+### Remesh
+
+Rebuilds the whole model with triangles close to a target edge length — evens out a mesh with wildly
+varying triangle sizes (CGAL isotropic remeshing).
+
+- **Target edge (mm)** — desired triangle edge length (seeded to the model's current average).
+- **Remesh** — splits the big triangles and merges the small ones to that size.
+
+> Both Subdivide-Apply and Remesh **replace the geometry** and clear any *not-yet-baked* paint on it
+> (already-baked relief is kept). If you had the mesh **Wireframe** on before, it stays on afterward.
+
+---
+
+## Baking & resetting
+
+- **Bake** — converts the current preview into real, permanent mesh geometry, restricted to the
+  painted area. Runs in the background; the button shows *Baking…* while it works.
+- **Erase all** — clears the active layer's paint.
+
+Baking is the exact same algorithm as the **Normal** preview, so what you see is what you get.
+
+---
+
+## Controls reference
+
+### Mouse — 3D view (while painting)
+
+| Input | Action |
+|-------|--------|
+| Left-drag | Paint the active layer |
+| Ctrl + drag | Rotate / pan the camera (works in seam mode too) |
+| Wheel | Zoom |
+
+### Mouse & keys — UV Editor
+
+| Input | Action |
+|-------|--------|
+| Left-click | Select island |
+| Left-drag | Move island |
+| Right-drag | Rotate island |
+| **R** / **S** | Modal rotate / scale (mouse drives it, click or Enter confirms, Esc cancels) |
+| **Shift** (while rotating) | Snap to global 15° marks |
+| Middle-drag | Pan |
+| Wheel | Zoom about cursor |
+| **Home** / **F** | Frame all islands |
+| **Ctrl+Z** / **Ctrl+Shift+Z** / **Ctrl+Y** | Undo / redo |
+
+### Seam mode
+
+| Input | Action |
+|-------|--------|
+| Click edge | Mark / unmark a seam (yellow = hover, red = marked) |
+| Click (Path mode) | Set start, then seam the shortest path to the next click |
+| Ctrl + drag | Rotate / pan camera |
+
+---
+
+## Tips & limitations
+
+- **Paint first, then bake.** The preview is free to explore; only Bake changes the real mesh.
+- **Not enough detail?** Subdivide or Remesh before painting fine textures.
+- **Inward cuts** (high Midlevel + big Depth) can self-intersect on thin walls or sharp concave
+  corners — keep Depth modest there.
+- **Fast vs Normal:** Fast preview shades a bump and shows only the active layer; use it for quick
+  tuning and smooth UV dragging, but trust **Normal**/**Bake** for the exact result.
+- **Topology changes drop unbaked paint.** Subdivide-Apply, Remesh, and Simplify replace the mesh, and
+  texture-displacement paint isn't remapped across that change (already-baked relief is unaffected).
+- **Island placements** are tied to the current unwrap. Re-painting or changing the Seam angle can
+  re-segment the charts and renumber them, so a re-unwrap re-lays the connected net and discards
+  hand placements made before it.
+- **Connect islands** is on by default; turn it off (per layer) for the classic packed-grid layout, or
+  if an unfold looks wrong on an unusual mesh.

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+       transform="rotate(-135)"
+       rx="0.49804688" />
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+       style="fill:#009688;fill-opacity:1;stroke-width:1.00157;stroke-dasharray:none"
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+       width="9.7995005"
+       height="0.95338309"
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+       transform="rotate(-135)"
+       rx="0.47669154" />
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+  </g>
+</svg>

resources/shaders/110/texture_displacement_bump.fs

@@ -0,0 +1,133 @@
+#version 110
+
+// See resources/shaders/140/texture_displacement_bump.fs for full documentation; this is the
+// GLSL 1.10 compatibility variant (same logic, older syntax).
+
+#define INTENSITY_CORRECTION 0.6
+
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SPECULAR   (0.125 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SHININESS  20.0
+
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+
+#define INTENSITY_AMBIENT    0.3
+
+const vec3 ZERO = vec3(0.0, 0.0, 0.0);
+
+uniform vec4 uniform_color;
+uniform bool volume_mirrored;
+
+uniform mat4 view_model_matrix;
+uniform mat3 view_normal_matrix;
+
+uniform sampler2D height_tex;
+uniform vec2      height_tex_texel;
+uniform float      depth_mm;
+uniform float      tiling_scale;
+uniform float      rotation_rad;
+uniform vec2       uv_offset;
+uniform bool       invert;
+uniform bool       use_vertex_uv;
+// 2x3 affine (lin = (m00, m01, m10, m11), tr = (m02, m12)) applied to the dragged island's uv; see the
+// 140 variant. Identity when nothing is dragged.
+uniform vec4       island_delta_lin;
+uniform vec2       island_delta_tr;
+
+varying vec3  clipping_planes_dots;
+varying vec4  model_pos;
+varying vec4  world_pos;
+varying float weight;
+varying float island_active;
+varying vec2  vertex_uv;
+
+void projection_axes(vec3 n, out vec3 t, out vec3 b)
+{
+    vec3 an = abs(n);
+    if (an.x >= an.y && an.x >= an.z) {        // planar = p.yz
+        t = vec3(0.0, 1.0, 0.0);
+        b = vec3(0.0, 0.0, 1.0);
+    } else if (an.y >= an.x && an.y >= an.z) { // planar = p.xz
+        t = vec3(1.0, 0.0, 0.0);
+        b = vec3(0.0, 0.0, 1.0);
+    } else {                                   // planar = p.xy
+        t = vec3(1.0, 0.0, 0.0);
+        b = vec3(0.0, 1.0, 0.0);
+    }
+}
+
+vec2 project_uv(vec3 p, vec3 n)
+{
+    vec3 an = abs(n);
+    vec2 planar = (an.x >= an.y && an.x >= an.z) ? p.yz : ((an.y >= an.x && an.y >= an.z) ? p.xz : p.xy);
+    planar *= (tiling_scale > 1e-6) ? (1.0 / tiling_scale) : 1.0;
+    float cs = cos(rotation_rad);
+    float sn = sin(rotation_rad);
+    return vec2(planar.x * cs - planar.y * sn, planar.x * sn + planar.y * cs) + uv_offset;
+}
+
+void main()
+{
+    if (any(lessThan(clipping_planes_dots, ZERO)))
+        discard;
+
+    vec3 triangle_normal = normalize(cross(dFdx(model_pos.xyz), dFdy(model_pos.xyz)));
+    if (volume_mirrored)
+        triangle_normal = -triangle_normal;
+
+    if (use_vertex_uv) {
+        // Mikkelsen surface-gradient bump; see the 140 variant for the full rationale. Scale-exact
+        // for a conformal LSCM map (no global 1/tiling assumption), and gated by the paint weight
+        // via a multiply so the branch stays uniform (use_vertex_uv is a uniform).
+        vec2 uv = (island_active > 0.5)
+                    ? vec2(dot(island_delta_lin.xy, vertex_uv), dot(island_delta_lin.zw, vertex_uv)) + island_delta_tr
+                    : vertex_uv;
+        float h = texture2D(height_tex, uv).r;
+        float k = (invert ? -1.0 : 1.0) * depth_mm * clamp(weight, 0.0, 1.0);
+        vec3  sigmaS = dFdx(model_pos.xyz);
+        vec3  sigmaT = dFdy(model_pos.xyz);
+        vec3  R1 = cross(sigmaT, triangle_normal);
+        vec3  R2 = cross(triangle_normal, sigmaS);
+        float det = dot(sigmaS, R1);
+        float dHdx = k * dFdx(h);
+        float dHdy = k * dFdy(h);
+        if (abs(det) > 1e-12)
+            triangle_normal = normalize(triangle_normal - (dHdx * R1 + dHdy * R2) / det);
+    } else if (weight > 0.0) {
+        vec2 uv = project_uv(model_pos.xyz, triangle_normal);
+        vec3 t, b;
+        projection_axes(triangle_normal, t, b);
+
+        float hL = texture2D(height_tex, uv - vec2(height_tex_texel.x, 0.0)).r;
+        float hR = texture2D(height_tex, uv + vec2(height_tex_texel.x, 0.0)).r;
+        float hD = texture2D(height_tex, uv - vec2(0.0, height_tex_texel.y)).r;
+        float hU = texture2D(height_tex, uv + vec2(0.0, height_tex_texel.y)).r;
+
+        vec2 dh_duv = vec2((hR - hL) / (2.0 * height_tex_texel.x), (hU - hD) / (2.0 * height_tex_texel.y));
+        float inv_tiling = (tiling_scale > 1e-6) ? (1.0 / tiling_scale) : 1.0;
+        float amplitude  = (invert ? -1.0 : 1.0) * depth_mm * inv_tiling * clamp(weight, 0.0, 1.0);
+
+        float cs = cos(rotation_rad);
+        float sn = sin(rotation_rad);
+        vec2  slope = amplitude * vec2(dh_duv.x * cs + dh_duv.y * sn, -dh_duv.x * sn + dh_duv.y * cs);
+
+        vec3 gradient = slope.x * t + slope.y * b;
+        gradient -= triangle_normal * dot(triangle_normal, gradient);
+        triangle_normal = normalize(triangle_normal - gradient);
+    }
+
+    vec3 eye_normal = normalize(view_normal_matrix * triangle_normal);
+    float NdotL = max(dot(eye_normal, LIGHT_TOP_DIR), 0.0);
+
+    vec2 intensity = vec2(0.0);
+    intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
+    vec3 position = (view_model_matrix * model_pos).xyz;
+    intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(position), reflect(-LIGHT_TOP_DIR, eye_normal)), 0.0), LIGHT_TOP_SHININESS);
+
+    NdotL = max(dot(eye_normal, LIGHT_FRONT_DIR), 0.0);
+    intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
+
+    gl_FragColor = vec4(vec3(intensity.y) + uniform_color.rgb * intensity.x, uniform_color.a);
+}

resources/shaders/110/texture_displacement_bump.vs

@@ -0,0 +1,34 @@
+#version 110
+
+// See resources/shaders/140/texture_displacement_bump.vs for full documentation; this is the
+// GLSL 1.10 compatibility variant.
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+uniform mat4 volume_world_matrix;
+uniform vec2 z_range;
+uniform vec4 clipping_plane;
+
+attribute vec3 v_position;
+attribute vec3 v_normal;    // .x = paint weight (0/1); .y = 1 for the dragged island's vertices
+attribute vec2 v_tex_coord; // precomputed texture uv, used only when use_vertex_uv is set
+
+varying vec3  clipping_planes_dots;
+varying vec4  model_pos;
+varying vec4  world_pos;
+varying float weight;
+varying float island_active;
+varying vec2  vertex_uv;
+
+void main()
+{
+    model_pos = vec4(v_position, 1.0);
+    world_pos = volume_world_matrix * model_pos;
+
+    gl_Position = projection_matrix * view_model_matrix * model_pos;
+    clipping_planes_dots = vec3(dot(world_pos, clipping_plane), world_pos.z - z_range.x, z_range.y - world_pos.z);
+
+    weight        = v_normal.x;
+    island_active = v_normal.y;
+    vertex_uv     = v_tex_coord;
+}

resources/shaders/110/texture_displacement_uvcheck.fs

@@ -0,0 +1,70 @@
+#version 110
+
+// See resources/shaders/140/texture_displacement_uvcheck.fs; GLSL 1.10 compatibility variant.
+
+#define INTENSITY_CORRECTION 0.6
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+#define INTENSITY_AMBIENT    0.3
+const vec3 ZERO = vec3(0.0, 0.0, 0.0);
+
+uniform mat3 view_normal_matrix;
+uniform bool volume_mirrored;
+
+uniform int   mode;
+uniform float checker_freq;
+uniform float tiling_scale;
+uniform float rotation_rad;
+uniform vec2  uv_offset;
+uniform bool  use_vertex_uv;
+
+varying vec3  clipping_planes_dots;
+varying vec4  model_pos;
+varying vec4  world_pos;
+varying float distortion;
+varying vec2  vertex_uv;
+
+vec2 project_uv(vec3 p, vec3 n)
+{
+    vec3 an = abs(n);
+    vec2 planar = (an.x >= an.y && an.x >= an.z) ? p.yz : ((an.y >= an.x && an.y >= an.z) ? p.xz : p.xy);
+    planar *= (tiling_scale > 1e-6) ? (1.0 / tiling_scale) : 1.0;
+    float cs = cos(rotation_rad);
+    float sn = sin(rotation_rad);
+    return vec2(planar.x * cs - planar.y * sn, planar.x * sn + planar.y * cs) + uv_offset;
+}
+
+vec3 heatmap(float t)
+{
+    t = clamp(t, 0.0, 1.0);
+    return clamp(vec3(1.5 - abs(4.0 * t - 3.0),
+                      1.5 - abs(4.0 * t - 2.0),
+                      1.5 - abs(4.0 * t - 1.0)), 0.0, 1.0);
+}
+
+void main()
+{
+    if (any(lessThan(clipping_planes_dots, ZERO)))
+        discard;
+
+    vec3 triangle_normal = normalize(cross(dFdx(model_pos.xyz), dFdy(model_pos.xyz)));
+    if (volume_mirrored)
+        triangle_normal = -triangle_normal;
+
+    vec3 base;
+    if (mode == 1) {
+        base = heatmap(distortion);
+    } else {
+        vec2 uv = use_vertex_uv ? vertex_uv : project_uv(model_pos.xyz, triangle_normal);
+        vec2 c  = floor(uv * checker_freq);
+        float check = mod(c.x + c.y, 2.0);
+        base = (check < 0.5) ? vec3(0.22, 0.23, 0.26) : vec3(0.82, 0.83, 0.86);
+    }
+
+    vec3  eye_normal = normalize(view_normal_matrix * triangle_normal);
+    float intensity  = INTENSITY_AMBIENT + max(dot(eye_normal, LIGHT_TOP_DIR), 0.0) * LIGHT_TOP_DIFFUSE
+                                         + max(dot(eye_normal, LIGHT_FRONT_DIR), 0.0) * LIGHT_FRONT_DIFFUSE;
+    gl_FragColor = vec4(base * intensity, 1.0);
+}

resources/shaders/110/texture_displacement_uvcheck.vs

@@ -0,0 +1,31 @@
+#version 110
+
+// See resources/shaders/140/texture_displacement_uvcheck.vs; GLSL 1.10 compatibility variant.
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+uniform mat4 volume_world_matrix;
+uniform vec2 z_range;
+uniform vec4 clipping_plane;
+
+attribute vec3 v_position;
+attribute vec3 v_normal;    // .x = per-vertex uv distortion
+attribute vec2 v_tex_coord; // precomputed texture uv, used only when use_vertex_uv is set
+
+varying vec3  clipping_planes_dots;
+varying vec4  model_pos;
+varying vec4  world_pos;
+varying float distortion;
+varying vec2  vertex_uv;
+
+void main()
+{
+    model_pos = vec4(v_position, 1.0);
+    world_pos = volume_world_matrix * model_pos;
+
+    gl_Position = projection_matrix * view_model_matrix * model_pos;
+    clipping_planes_dots = vec3(dot(world_pos, clipping_plane), world_pos.z - z_range.x, z_range.y - world_pos.z);
+
+    distortion = v_normal.x;
+    vertex_uv  = v_tex_coord;
+}

resources/shaders/140/texture_displacement_bump.fs

@@ -0,0 +1,186 @@
+#version 140
+
+// Fast, geometry-free preview of texture displacement: perturbs the *shading* normal from the
+// height texture's local gradient (a bump map), faded out by the per-vertex paint weight. The
+// true, exact result is what "Bake" produces via libslic3r/TextureDisplacement.cpp on the CPU.
+//
+// The bake displaces each surface point along its normal by H = +/- depth_mm * (h(uv) - midlevel),
+// with uv from the layer's projection. The perturbed normal is the analytic
+//
+//     N' = normalize(N - (dH/da) * T - (dH/db) * B)
+//
+// over any orthonormal surface tangent pair (T, B), where the two slopes are real mm-per-mm
+// derivatives. Two things have to be right for the preview's apparent depth to match the bake's:
+// the tangent frame the gradient is expressed in, and the uv->mm scale that turns a texel
+// difference into a slope. Getting the scale wrong is a uniform flattening (a raw texel difference
+// is dh over one texel step, not over one mm); getting the frame wrong tilts the bump along the
+// wrong axes.
+//
+// Two projection paths:
+//   * Triplanar (use_vertex_uv = 0): uv and the tangent axes are derived in-shader from the dominant
+//     normal axis, mirroring libslic3r's project_planar()/apply_uv_transform(), and the slope is
+//     formed analytically (there is a closed-form uv, so 1 uv unit is exactly tiling_scale mm).
+//   * Precomputed uv (use_vertex_uv = 1, used for LSCM): uv comes per-vertex from the CPU (the LSCM
+//     unwrap with island placement + tiling/rotation/offset already folded in), and the perturbed
+//     normal is built with Mikkelsen's method -- the surface gradient taken straight from the
+//     screen-space derivatives of the sampled height and position. This makes no uv->mm scale
+//     assumption, which matters because an LSCM map is conformal, not isometric: the local mm-per-uv
+//     varies across the chart, so a single global 1/tiling factor (what an earlier version used) got
+//     the apparent depth wrong. This path is also what makes the fast preview follow the UV editor:
+//     move an island and its uv -- hence its bump -- moves with it.
+
+#define INTENSITY_CORRECTION 0.6
+
+// normalized values for (-0.6/1.31, 0.6/1.31, 1./1.31)
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SPECULAR   (0.125 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SHININESS  20.0
+
+// normalized values for (1./1.43, 0.2/1.43, 1./1.43)
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+
+#define INTENSITY_AMBIENT    0.3
+
+const vec3 ZERO = vec3(0.0, 0.0, 0.0);
+
+uniform vec4 uniform_color;
+uniform bool volume_mirrored;
+
+uniform mat4 view_model_matrix;
+uniform mat3 view_normal_matrix;
+
+uniform sampler2D height_tex;
+uniform vec2      height_tex_texel; // (1/width, 1/height) of height_tex
+uniform float      depth_mm;
+uniform float      tiling_scale;
+uniform float      rotation_rad;
+uniform vec2       uv_offset;
+uniform bool       invert;
+uniform bool       use_vertex_uv; // true: sample at vertex_uv with a derived tangent frame (LSCM)
+// A 2x3 affine (columns packed as lin = (m00, m01, m10, m11), tr = (m02, m12)) applied to the uv of
+// the island currently being dragged in the UV editor (island_active > 0.5). Identity when nothing is
+// dragged, so this whole path is a no-op then. Lets a UV island drag move the bump on the model with
+// only a uniform update 
+uniform vec4       island_delta_lin;
+uniform vec2       island_delta_tr;
+
+in vec3  clipping_planes_dots;
+in vec4  model_pos;
+in vec4  world_pos;
+in float weight;
+in float island_active;
+in vec2  vertex_uv;
+
+out vec4 out_color;
+
+// The two model-space axes the triplanar planar coordinate is read off, per dominant normal
+// component - same choice libslic3r's project_planar() makes, so planar.x runs along t, planar.y
+// along b.
+void projection_axes(vec3 n, out vec3 t, out vec3 b)
+{
+    vec3 an = abs(n);
+    if (an.x >= an.y && an.x >= an.z) {        // planar = p.yz
+        t = vec3(0.0, 1.0, 0.0);
+        b = vec3(0.0, 0.0, 1.0);
+    } else if (an.y >= an.x && an.y >= an.z) { // planar = p.xz
+        t = vec3(1.0, 0.0, 0.0);
+        b = vec3(0.0, 0.0, 1.0);
+    } else {                                   // planar = p.xy
+        t = vec3(1.0, 0.0, 0.0);
+        b = vec3(0.0, 1.0, 0.0);
+    }
+}
+
+vec2 project_uv(vec3 p, vec3 n)
+{
+    vec3 an = abs(n);
+    vec2 planar = (an.x >= an.y && an.x >= an.z) ? p.yz : ((an.y >= an.x && an.y >= an.z) ? p.xz : p.xy);
+    planar *= (tiling_scale > 1e-6) ? (1.0 / tiling_scale) : 1.0;
+    float cs = cos(rotation_rad);
+    float sn = sin(rotation_rad);
+    return vec2(planar.x * cs - planar.y * sn, planar.x * sn + planar.y * cs) + uv_offset;
+}
+
+void main()
+{
+    if (any(lessThan(clipping_planes_dots, ZERO)))
+        discard;
+
+    vec3 triangle_normal = normalize(cross(dFdx(model_pos.xyz), dFdy(model_pos.xyz)));
+    if (volume_mirrored)
+        triangle_normal = -triangle_normal;
+
+    if (use_vertex_uv) {
+        // Precomputed-uv (LSCM) path - Mikkelsen's surface-gradient bump ("Bump Mapping
+        // Unparametrized Surfaces on the GPU"). The perturbed normal is derived straight from the
+        // screen-space derivatives of the *sampled height* and the position, so it is scale-exact
+        // with no uv->mm assumption at all - which is the whole point here: an LSCM map is conformal,
+        // not isometric, so the local mm-per-uv varies across the chart and the earlier "one global
+        // 1/tiling factor" got the depth visibly wrong. dFdx(h) captures the true on-screen rate of
+        // change however the chart is stretched or however fine the tiling is.
+        //
+        // use_vertex_uv is a uniform, so this whole branch is uniform control flow and the texture
+        // derivatives are well defined; the paint weight gates the result by a plain multiply (k)
+        // rather than a per-fragment branch, keeping it that way.
+        // The dragged island's uv rides a uniform affine so its bump moves without a rebuild; every
+        // other vertex (island_active == 0) samples its baked uv unchanged.
+        vec2 uv = (island_active > 0.5)
+                    ? vec2(dot(island_delta_lin.xy, vertex_uv), dot(island_delta_lin.zw, vertex_uv)) + island_delta_tr
+                    : vertex_uv;
+        float h = texture(height_tex, uv).r;
+        float k = (invert ? -1.0 : 1.0) * depth_mm * clamp(weight, 0.0, 1.0);
+        vec3  sigmaS = dFdx(model_pos.xyz);
+        vec3  sigmaT = dFdy(model_pos.xyz);
+        vec3  R1 = cross(sigmaT, triangle_normal);
+        vec3  R2 = cross(triangle_normal, sigmaS);
+        float det = dot(sigmaS, R1);
+        float dHdx = k * dFdx(h);
+        float dHdy = k * dFdy(h);
+        if (abs(det) > 1e-12)
+            triangle_normal = normalize(triangle_normal - (dHdx * R1 + dHdy * R2) / det);
+    } else if (weight > 0.0) {
+        // Triplanar path: uv and the tangent axes are reconstructed in-shader from the dominant
+        // normal component (see header). The gradient is expressed analytically because there is a
+        // closed-form uv here, unlike the LSCM case.
+        vec2 uv = project_uv(model_pos.xyz, triangle_normal);
+        vec3 t, b;
+        projection_axes(triangle_normal, t, b);
+
+        float hL = texture(height_tex, uv - vec2(height_tex_texel.x, 0.0)).r;
+        float hR = texture(height_tex, uv + vec2(height_tex_texel.x, 0.0)).r;
+        float hD = texture(height_tex, uv - vec2(0.0, height_tex_texel.y)).r;
+        float hU = texture(height_tex, uv + vec2(0.0, height_tex_texel.y)).r;
+
+        // Central difference, per uv unit (not per texel).
+        vec2 dh_duv = vec2((hR - hL) / (2.0 * height_tex_texel.x), (hU - hD) / (2.0 * height_tex_texel.y));
+
+        // uv -> mm is 1/tiling_scale for the triplanar projection, so this turns the uv-space
+        // gradient into a real surface slope.
+        float inv_tiling = (tiling_scale > 1e-6) ? (1.0 / tiling_scale) : 1.0;
+        float amplitude  = (invert ? -1.0 : 1.0) * depth_mm * inv_tiling * clamp(weight, 0.0, 1.0);
+        // uv was rotated by project_uv() while t/b are the unrotated model axes, so rotate the
+        // gradient back into the axes' frame.
+        float cs = cos(rotation_rad);
+        float sn = sin(rotation_rad);
+        vec2  slope = amplitude * vec2(dh_duv.x * cs + dh_duv.y * sn, -dh_duv.x * sn + dh_duv.y * cs);
+
+        vec3 gradient = slope.x * t + slope.y * b;
+        gradient -= triangle_normal * dot(triangle_normal, gradient);
+        triangle_normal = normalize(triangle_normal - gradient);
+    }
+
+    vec3 eye_normal = normalize(view_normal_matrix * triangle_normal);
+    float NdotL = max(dot(eye_normal, LIGHT_TOP_DIR), 0.0);
+
+    vec2 intensity = vec2(0.0);
+    intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
+    vec3 position = (view_model_matrix * model_pos).xyz;
+    intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(position), reflect(-LIGHT_TOP_DIR, eye_normal)), 0.0), LIGHT_TOP_SHININESS);
+
+    NdotL = max(dot(eye_normal, LIGHT_FRONT_DIR), 0.0);
+    intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
+
+    out_color = vec4(vec3(intensity.y) + uniform_color.rgb * intensity.x, uniform_color.a);
+}

resources/shaders/140/texture_displacement_bump.vs

@@ -0,0 +1,44 @@
+#version 140
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+
+uniform mat4 volume_world_matrix;
+// Clipping plane, x = min z, y = max z. Used by the FFF and SLA previews to clip with a top / bottom plane.
+uniform vec2 z_range;
+// Clipping plane - general orientation. Used by the SLA gizmo.
+uniform vec4 clipping_plane;
+
+in vec3 v_position;
+// GLModel's P3N3T2 layout (position + normal + texcoord), reused so this mesh builds and renders
+// like any other GLModel rather than needing a bespoke vertex buffer. The two spare channels carry
+// what the bump preview actually needs per vertex:
+//   v_normal.x   -- the active layer's paint weight, 0 (untouched) or 1 (painted).
+//   v_normal.y   -- 1 for a vertex of the island currently being dragged in the UV editor, else 0.
+//                   The fragment shader applies island_delta to those vertices' uv, so a UV drag is a
+//                   single uniform update rather than a whole-mesh rebuild (like Adjust placement).
+//   v_tex_coord  -- the precomputed texture uv for this vertex, valid only when use_vertex_uv is set
+//                   (i.e. the LSCM projection, where uv can't be reconstructed in the shader). The
+//                   triplanar path ignores it and projects in the fragment shader instead.
+in vec3 v_normal;
+in vec2 v_tex_coord;
+
+out vec3  clipping_planes_dots;
+out vec4  model_pos;
+out vec4  world_pos;
+out float weight;
+out float island_active;
+out vec2  vertex_uv;
+
+void main()
+{
+    model_pos = vec4(v_position, 1.0);
+    world_pos = volume_world_matrix * model_pos;
+
+    gl_Position = projection_matrix * view_model_matrix * model_pos;
+    clipping_planes_dots = vec3(dot(world_pos, clipping_plane), world_pos.z - z_range.x, z_range.y - world_pos.z);
+
+    weight        = v_normal.x;
+    island_active = v_normal.y;
+    vertex_uv     = v_tex_coord;
+}

resources/shaders/140/texture_displacement_uvcheck.fs

@@ -0,0 +1,83 @@
+#version 140
+
+// UV-check overlay for the texture-displacement gizmo, drawn over the painted patch so the LSCM
+// unwrap can be sanity-checked on the real 3D surface (mode set by the `mode` uniform):
+//   mode 0 - Checker: a procedural checkerboard sampled at the layer's uv. Even squares that stay
+//             square everywhere on the model mean the unwrap is low-distortion; squares that smear or
+//             shear reveal exactly where it stretches. Same uv the bake samples, so what you see is
+//             where the texture actually lands.
+//   mode 1 - Distortion heatmap: the per-vertex area-distortion carried in `distortion`, blue
+//             (compressed) -> green (ideal) -> red (stretched).
+// Both are lit with the same cheap two-light diffuse the bump preview uses, so the surface still
+// reads as 3D.
+
+#define INTENSITY_CORRECTION 0.6
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+#define INTENSITY_AMBIENT    0.3
+const vec3 ZERO = vec3(0.0, 0.0, 0.0);
+
+uniform mat3 view_normal_matrix;
+uniform bool volume_mirrored;
+
+uniform int   mode;          // 0 checker, 1 distortion
+uniform float checker_freq;  // checker squares per uv unit (one uv unit == one texture tile)
+uniform float tiling_scale;
+uniform float rotation_rad;
+uniform vec2  uv_offset;
+uniform bool  use_vertex_uv;
+
+in vec3  clipping_planes_dots;
+in vec4  model_pos;
+in vec4  world_pos;
+in float distortion;
+in vec2  vertex_uv;
+
+out vec4 out_color;
+
+vec2 project_uv(vec3 p, vec3 n)
+{
+    vec3 an = abs(n);
+    vec2 planar = (an.x >= an.y && an.x >= an.z) ? p.yz : ((an.y >= an.x && an.y >= an.z) ? p.xz : p.xy);
+    planar *= (tiling_scale > 1e-6) ? (1.0 / tiling_scale) : 1.0;
+    float cs = cos(rotation_rad);
+    float sn = sin(rotation_rad);
+    return vec2(planar.x * cs - planar.y * sn, planar.x * sn + planar.y * cs) + uv_offset;
+}
+
+// Blue -> cyan -> green -> yellow -> red over t in [0,1].
+vec3 heatmap(float t)
+{
+    t = clamp(t, 0.0, 1.0);
+    return clamp(vec3(1.5 - abs(4.0 * t - 3.0),
+                      1.5 - abs(4.0 * t - 2.0),
+                      1.5 - abs(4.0 * t - 1.0)), 0.0, 1.0);
+}
+
+void main()
+{
+    if (any(lessThan(clipping_planes_dots, ZERO)))
+        discard;
+
+    vec3 triangle_normal = normalize(cross(dFdx(model_pos.xyz), dFdy(model_pos.xyz)));
+    if (volume_mirrored)
+        triangle_normal = -triangle_normal;
+
+    vec3 base;
+    if (mode == 1) {
+        base = heatmap(distortion);
+    } else {
+        vec2 uv = use_vertex_uv ? vertex_uv : project_uv(model_pos.xyz, triangle_normal);
+        vec2 c  = floor(uv * checker_freq);
+        float check = mod(c.x + c.y, 2.0);
+        // Two distinct greys, plus a faint tint on one set so orientation is readable at a glance.
+        base = (check < 0.5) ? vec3(0.22, 0.23, 0.26) : vec3(0.82, 0.83, 0.86);
+    }
+
+    vec3  eye_normal = normalize(view_normal_matrix * triangle_normal);
+    float intensity  = INTENSITY_AMBIENT + max(dot(eye_normal, LIGHT_TOP_DIR), 0.0) * LIGHT_TOP_DIFFUSE
+                                         + max(dot(eye_normal, LIGHT_FRONT_DIR), 0.0) * LIGHT_FRONT_DIFFUSE;
+    out_color = vec4(base * intensity, 1.0);
+}

resources/shaders/140/texture_displacement_uvcheck.vs

@@ -0,0 +1,36 @@
+#version 140
+
+// Vertex stage for the UV-check overlay (checker / distortion heatmap) drawn over the painted patch
+// by GLGizmoTextureDisplacement. Reuses GLModel's P3N3T2 layout so it needs no bespoke buffer:
+//   v_normal.x  - per-vertex UV distortion (uv-area / surface-area ratio, remapped so 0.5 = ideal);
+//                  only the distortion mode reads it.
+//   v_tex_coord - precomputed texture uv, valid only when use_vertex_uv is set (LSCM); the checker
+//                  mode reconstructs uv in the fragment shader otherwise.
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+uniform mat4 volume_world_matrix;
+uniform vec2 z_range;
+uniform vec4 clipping_plane;
+
+in vec3 v_position;
+in vec3 v_normal;
+in vec2 v_tex_coord;
+
+out vec3  clipping_planes_dots;
+out vec4  model_pos;
+out vec4  world_pos;
+out float distortion;
+out vec2  vertex_uv;
+
+void main()
+{
+    model_pos = vec4(v_position, 1.0);
+    world_pos = volume_world_matrix * model_pos;
+
+    gl_Position = projection_matrix * view_model_matrix * model_pos;
+    clipping_planes_dots = vec3(dot(world_pos, clipping_plane), world_pos.z - z_range.x, z_range.y - world_pos.z);
+
+    distortion = v_normal.x;
+    vertex_uv  = v_tex_coord;
+}

src/libslic3r/CMakeLists.txt

@@ -441,6 +441,8 @@ set(lisbslic3r_sources
     Tesselate.cpp
     Tesselate.hpp
     TextConfiguration.hpp
+    TextureDisplacement.cpp
+    TextureDisplacement.hpp
     Thread.cpp
     Thread.hpp
     Time.cpp

src/libslic3r/MeshBoolean.cpp

@@ -26,6 +26,13 @@
 #include <CGAL/property_map.h>
 #include <CGAL/boost/graph/copy_face_graph.h>
 #include <CGAL/boost/graph/Face_filtered_graph.h>
+// For parameterize_lscm()
+#include <CGAL/Polygon_mesh_processing/border.h>
+#include <CGAL/Polygon_mesh_processing/connected_components.h>
+#include <CGAL/Polygon_mesh_processing/detect_features.h>
+#include <CGAL/Surface_mesh_parameterization/Error_code.h>
+#include <CGAL/Surface_mesh_parameterization/LSCM_parameterizer_3.h>
+#include <CGAL/Surface_mesh_parameterization/parameterize.h>
 // BBS: for boolean using mcut
 #include "mcut/include/mcut/mcut.h"
 
@@ -249,6 +256,130 @@ indexed_triangle_set cgal_to_indexed_triangle_set(const CGALMesh &cgalmesh)
     return cgal_to_indexed_triangle_set(cgalmesh.m);
 }
 
+// /////////////////////////////////////////////////////////////////////////////
+// Isotropic remeshing
+// /////////////////////////////////////////////////////////////////////////////
+
+indexed_triangle_set remesh_isotropic(const indexed_triangle_set &mesh, double target_edge_length,
+                                      unsigned n_iterations, double sharp_angle_deg)
+{
+    if (mesh.indices.empty() || target_edge_length <= 0.0)
+        return mesh;
+
+    _EpicMesh cgal_mesh;
+    triangle_mesh_to_cgal(mesh.vertices, mesh.indices, cgal_mesh);
+    if (cgal_mesh.is_empty() || cgal_mesh.number_of_faces() == 0)
+        return mesh;
+
+    // Surface_mesh::add_face() refuses any face that would make the mesh non-manifold and returns a
+    // null descriptor instead. Remeshing a mesh that silently lost faces that way produces holes in
+    // the output, so bail out and let the caller report it rather than hand back a punctured model.
+    if (cgal_mesh.number_of_faces() != mesh.indices.size())
+        return mesh;
+
+    using edge_descriptor = boost::graph_traits<_EpicMesh>::edge_descriptor;
+    try {
+        // Sharp edges and open borders are pinned before remeshing. Without that, the tangential
+        // relaxation pass slides vertices along the surface and rounds every hard feature off - a
+        // cube comes back with wobbly, eroded edges, which is the most visible way "remeshing does
+        // not work properly". protect_constraints() forbids splitting or collapsing them, but it
+        // requires each constrained edge to already be shorter than 4/3 * target, hence the split
+        // first (passing the map so the halves inherit the constraint). This mirrors CGAL's own
+        // isotropic_remeshing example.
+        auto ecm = cgal_mesh.add_property_map<edge_descriptor, bool>("e:is_constrained", false).first;
+        if (sharp_angle_deg > 0.0)
+            CGALProc::detect_sharp_edges(cgal_mesh, sharp_angle_deg, ecm);
+        for (edge_descriptor e : edges(cgal_mesh)) {
+            const auto h = halfedge(e, cgal_mesh);
+            if (is_border(h, cgal_mesh) || is_border(opposite(h, cgal_mesh), cgal_mesh))
+                put(ecm, e, true);
+        }
+
+        std::vector<edge_descriptor> constrained;
+        for (edge_descriptor e : edges(cgal_mesh))
+            if (get(ecm, e))
+                constrained.push_back(e);
+        if (!constrained.empty())
+            CGALProc::split_long_edges(constrained, target_edge_length, cgal_mesh,
+                                       CGALParams::edge_is_constrained_map(ecm));
+
+        CGALProc::isotropic_remeshing(faces(cgal_mesh), target_edge_length, cgal_mesh,
+                                      CGALParams::number_of_iterations(n_iterations)
+                                          .edge_is_constrained_map(ecm)
+                                          .protect_constraints(true));
+    } catch (const std::exception &) {
+        return mesh; // CGAL throws on some non-manifold / degenerate inputs; leave the mesh untouched
+    }
+    if (cgal_mesh.number_of_faces() == 0)
+        return mesh;
+
+    // isotropic_remeshing edits in place, and its edge collapses only *mark* vertices and faces as
+    // removed - the underlying arrays keep the holes until the garbage is collected. That matters
+    // because cgal_to_indexed_triangle_set() numbers its output vertices by iteration order (which
+    // skips removed slots) while reading each face's corner as the raw integer value of the vertex
+    // descriptor (which does not). Past the first collapse the two disagree, so every triangle
+    // points at the wrong vertices, and any descriptor beyond the live vertex count is dropped
+    // together with its triangle. Compacting first makes descriptor == iteration order again.
+    cgal_mesh.collect_garbage();
+    return cgal_to_indexed_triangle_set(cgal_mesh);
+}
+
+// /////////////////////////////////////////////////////////////////////////////
+// UV parameterization
+// /////////////////////////////////////////////////////////////////////////////
+
+std::optional<std::vector<Vec2f>> parameterize_lscm(const indexed_triangle_set &mesh)
+{
+    namespace SMP = CGAL::Surface_mesh_parameterization;
+
+    if (mesh.indices.empty())
+        return std::nullopt;
+
+    _EpicMesh cgal_mesh;
+    triangle_mesh_to_cgal(mesh.vertices, mesh.indices, cgal_mesh);
+
+    using vertex_descriptor   = boost::graph_traits<_EpicMesh>::vertex_descriptor;
+    using halfedge_descriptor = boost::graph_traits<_EpicMesh>::halfedge_descriptor;
+
+    // LSCM assumes a single topological disk: one connected component, one boundary loop. A patch
+    // with several disconnected painted islands, or with a hole in it, doesn't qualify -- bail out
+    // rather than silently parameterizing just one arbitrary piece of it.
+    {
+        std::vector<std::size_t> component_id(num_faces(cgal_mesh));
+        const std::size_t        num_components = CGAL::Polygon_mesh_processing::connected_components(
+            cgal_mesh, CGAL::make_property_map(component_id));
+        if (num_components != 1)
+            return std::nullopt;
+    }
+
+    const halfedge_descriptor border = CGAL::Polygon_mesh_processing::longest_border(cgal_mesh).first;
+    if (border == halfedge_descriptor())
+        return std::nullopt; // no boundary at all -- a closed patch, which isn't a disk either
+
+    using Point_2 = EpicKernel::Point_2;
+    using UV_pmap = _EpicMesh::Property_map<vertex_descriptor, Point_2>;
+    UV_pmap uv_map = cgal_mesh.add_property_map<vertex_descriptor, Point_2>("h:uv", Point_2(0, 0)).first;
+
+    using Parameterizer = SMP::LSCM_parameterizer_3<_EpicMesh>;
+    const SMP::Error_code err = SMP::parameterize(cgal_mesh, Parameterizer(), border, uv_map);
+    if (err != SMP::OK)
+        return std::nullopt;
+
+    // triangle_mesh_to_cgal() adds vertices in the exact same order as mesh.vertices (see above),
+    // and Surface_mesh assigns indices sequentially on insertion into a fresh mesh, so a
+    // vertex_descriptor's index here is guaranteed to match the original input vertex index --
+    // the same assumption cgal_to_indexed_triangle_set() above already relies on.
+    std::vector<Vec2f> result(mesh.vertices.size(), Vec2f::Zero());
+    for (vertex_descriptor vd : vertices(cgal_mesh)) {
+        const std::size_t idx = std::size_t(vd);
+        if (idx < result.size()) {
+            const Point_2 &uv = uv_map[vd];
+            result[idx]        = Vec2f(float(uv.x()), float(uv.y()));
+        }
+    }
+    return result;
+}
+
 // /////////////////////////////////////////////////////////////////////////////
 // Boolean operations for CGAL meshes
 // /////////////////////////////////////////////////////////////////////////////

src/libslic3r/MeshBoolean.hpp

@@ -3,6 +3,8 @@
 
 #include <memory>
 #include <exception>
+#include <optional>
+#include <vector>
 
 #include <libslic3r/TriangleMesh.hpp>
 #include <Eigen/Geometry>
@@ -73,6 +75,22 @@ bool empty(const CGALMesh &mesh);
 
 // Repair a mesh using CGAL. Returns true on success. Optionally returns a summary of repairs and an error string.
 bool repair(TriangleMesh &mesh, RepairedMeshErrors *repaired_errors = nullptr, std::string *error = nullptr);
+
+// Real UV unwrap of an open mesh patch via CGAL's LSCM (Least Squares Conformal Maps) surface
+// parameterization. Returns one UV coordinate per input vertex (same indexing as `mesh.vertices`),
+// or nullopt if `mesh` isn't a single topological disk -- LSCM needs exactly one connected
+// component with exactly one boundary loop, true for a typical single brush stroke/patch but not
+// guaranteed for multiple disconnected painted islands merged into one mesh.
+std::optional<std::vector<Vec2f>> parameterize_lscm(const indexed_triangle_set &mesh);
+
+// Isotropic remeshing (CGAL): rebuilds the mesh so its triangles are close to a uniform target edge
+// length, splitting oversized triangles and collapsing undersized ones. Used to even out a model with
+// wildly varying triangle sizes so texture displacement has a consistent vertex density to work with.
+// Edges whose dihedral angle exceeds `sharp_angle_deg`, and any open border, are held fixed so hard
+// features survive instead of being eroded by the relaxation pass; pass 0 to remesh everything.
+// Returns the input unchanged if remeshing fails (e.g. a non-manifold or self-intersecting input).
+indexed_triangle_set remesh_isotropic(const indexed_triangle_set &mesh, double target_edge_length,
+                                      unsigned n_iterations = 3, double sharp_angle_deg = 40.0);
 }
 
 namespace mcut {

src/libslic3r/Model.cpp

@@ -1977,6 +1977,11 @@ void ModelVolume::reset_extra_facets()
     this->seam_facets.reset();
     this->mmu_segmentation_facets.reset();
     this->fuzzy_skin_facets.reset();
+    // Texture-displacement paint data has no remap-across-topology-change support yet (see
+    // build_texture_displacement()'s documented limitation), so it must be dropped here rather
+    // than left referring to a mesh that no longer matches it.
+    for (int i = 0; i < int(TEXTURE_DISPLACEMENT_MAX_LAYERS); ++i)
+        this->texture_displacement_facet(i).reset();
 }
 
 std::optional<TriangleSelector::SavedPainting> ModelVolume::save_painting() const

src/libslic3r/Model.hpp

@@ -19,6 +19,7 @@
 #include "TextConfiguration.hpp"
 #include "EmbossShape.hpp"
 #include "TriangleSelector.hpp"
+#include "TextureDisplacement.hpp"
 
 //BBS: add bbs 3mf
 #include "Format/bbs_3mf.hpp"
@@ -28,6 +29,7 @@
 #include "Format/STL.hpp"
 #include "Format/OBJ.hpp"
 
+#include <array>
 #include <map>
 #include <memory>
 #include <string>
@@ -878,6 +880,64 @@ public:
     // List of mesh facets painted for fuzzy skin.
     FacetsAnnotation    fuzzy_skin_facets;
 
+    // One independent paint mask per texture-displacement layer slot (see texture_displacement_layers
+    // below). Unlike the other facets fields above, a triangle may be painted (ENFORCER) in more
+    // than one of these simultaneously -- that overlap is what makes the layers "blend".
+    //
+    // These are 8 plain named fields rather than a std::array<FacetsAnnotation, N>: FacetsAnnotation's
+    // default/copy constructors are private and friended only to ModelVolume, but std::array's own
+    // implicitly-defined default/copy constructors are generated with std::array's access rights,
+    // not ModelVolume's -- so an array of FacetsAnnotation ends up with its default/copy
+    // constructors implicitly deleted regardless of the friend declaration. Use
+    // texture_displacement_facet(slot) below for array-like indexed access.
+    FacetsAnnotation texture_displacement_facets_0;
+    FacetsAnnotation texture_displacement_facets_1;
+    FacetsAnnotation texture_displacement_facets_2;
+    FacetsAnnotation texture_displacement_facets_3;
+    FacetsAnnotation texture_displacement_facets_4;
+    FacetsAnnotation texture_displacement_facets_5;
+    FacetsAnnotation texture_displacement_facets_6;
+    FacetsAnnotation texture_displacement_facets_7;
+
+    FacetsAnnotation& texture_displacement_facet(int slot) {
+        switch (slot) {
+        case 0: return texture_displacement_facets_0;
+        case 1: return texture_displacement_facets_1;
+        case 2: return texture_displacement_facets_2;
+        case 3: return texture_displacement_facets_3;
+        case 4: return texture_displacement_facets_4;
+        case 5: return texture_displacement_facets_5;
+        case 6: return texture_displacement_facets_6;
+        default: assert(slot == 7); return texture_displacement_facets_7;
+        }
+    }
+    const FacetsAnnotation& texture_displacement_facet(int slot) const { return const_cast<ModelVolume*>(this)->texture_displacement_facet(slot); }
+
+    // Small helpers for the constructor asserts below (kept out of line-noise at each call site).
+    bool texture_displacement_facets_ids_valid() const {
+        for (int i = 0; i < int(TEXTURE_DISPLACEMENT_MAX_LAYERS); ++i)
+            if (!texture_displacement_facet(i).id().valid() || texture_displacement_facet(i).id() == this->id())
+                return false;
+        return true;
+    }
+    bool texture_displacement_facets_ids_invalid() const {
+        for (int i = 0; i < int(TEXTURE_DISPLACEMENT_MAX_LAYERS); ++i)
+            if (texture_displacement_facet(i).id().valid())
+                return false;
+        return true;
+    }
+    bool texture_displacement_facets_all_empty() const {
+        for (int i = 0; i < int(TEXTURE_DISPLACEMENT_MAX_LAYERS); ++i)
+            if (!texture_displacement_facet(i).empty())
+                return false;
+        return true;
+    }
+
+    // Texture assets (height maps) and their projection/displacement parameters. Element order
+    // is not meaningful for baking (layers are applied in TextureDisplacementLayer::slot order,
+    // see build_texture_displacement()); it only reflects UI insertion order.
+    std::vector<TextureDisplacementLayer> texture_displacement_layers;
+
     // Save painting data before reset_extra_facets() discards it.
     // Used for replacing mesh without losing painting data.
     // Only for model parts (not modifiers/connectors).
@@ -1014,13 +1074,18 @@ public:
         this->seam_facets.set_new_unique_id();
         this->mmu_segmentation_facets.set_new_unique_id();
         this->fuzzy_skin_facets.set_new_unique_id();
+        for (int i = 0; i < int(TEXTURE_DISPLACEMENT_MAX_LAYERS); ++i)
+            this->texture_displacement_facet(i).set_new_unique_id();
     }
 
     bool is_fdm_support_painted() const { return !this->supported_facets.empty(); }
     bool is_seam_painted() const { return !this->seam_facets.empty(); }
     bool is_mm_painted() const { return !this->mmu_segmentation_facets.empty(); }
     bool is_fuzzy_skin_painted() const { return !this->fuzzy_skin_facets.empty(); }
-    bool is_any_painted() const { return is_fdm_support_painted() || is_seam_painted() || is_mm_painted() || is_fuzzy_skin_painted(); }
+    bool is_texture_displacement_painted() const { return !this->texture_displacement_facets_all_empty(); }
+    bool is_any_painted() const {
+        return is_fdm_support_painted() || is_seam_painted() || is_mm_painted() || is_fuzzy_skin_painted() || is_texture_displacement_painted();
+    }
     
     // Orca: Implement prusa's filament shrink compensation approach
     // Returns 0-based indices of extruders painted by multi-material painting gizmo.
@@ -1073,6 +1138,7 @@ private:
         assert(this->seam_facets.id().valid());
         assert(this->mmu_segmentation_facets.id().valid());
         assert(this->fuzzy_skin_facets.id().valid());
+        assert(this->texture_displacement_facets_ids_valid());
         assert(this->id() != this->config.id());
         assert(this->id() != this->supported_facets.id());
         assert(this->id() != this->seam_facets.id());
@@ -1089,6 +1155,7 @@ private:
         assert(this->seam_facets.id().valid());
         assert(this->mmu_segmentation_facets.id().valid());
         assert(this->fuzzy_skin_facets.id().valid());
+        assert(this->texture_displacement_facets_ids_valid());
         assert(this->id() != this->config.id());
         assert(this->id() != this->supported_facets.id());
         assert(this->id() != this->seam_facets.id());
@@ -1103,6 +1170,7 @@ private:
         assert(this->seam_facets.id().valid());
         assert(this->mmu_segmentation_facets.id().valid());
         assert(this->fuzzy_skin_facets.id().valid());
+        assert(this->texture_displacement_facets_ids_valid());
         assert(this->id() != this->config.id());
         assert(this->id() != this->supported_facets.id());
         assert(this->id() != this->seam_facets.id());
@@ -1116,10 +1184,16 @@ private:
         name(other.name), source(other.source), m_mesh(other.m_mesh), m_convex_hull(other.m_convex_hull),
         config(other.config), m_type(other.m_type), object(object), m_transformation(other.m_transformation),
         supported_facets(other.supported_facets), seam_facets(other.seam_facets), mmu_segmentation_facets(other.mmu_segmentation_facets),
-        fuzzy_skin_facets(other.fuzzy_skin_facets), cut_info(other.cut_info), text_configuration(other.text_configuration), emboss_shape(other.emboss_shape)
+        fuzzy_skin_facets(other.fuzzy_skin_facets),
+        texture_displacement_facets_0(other.texture_displacement_facets_0), texture_displacement_facets_1(other.texture_displacement_facets_1),
+        texture_displacement_facets_2(other.texture_displacement_facets_2), texture_displacement_facets_3(other.texture_displacement_facets_3),
+        texture_displacement_facets_4(other.texture_displacement_facets_4), texture_displacement_facets_5(other.texture_displacement_facets_5),
+        texture_displacement_facets_6(other.texture_displacement_facets_6), texture_displacement_facets_7(other.texture_displacement_facets_7),
+        texture_displacement_layers(other.texture_displacement_layers),
+        cut_info(other.cut_info), text_configuration(other.text_configuration), emboss_shape(other.emboss_shape)
     {
-		assert(this->id().valid()); 
-        assert(this->config.id().valid()); 
+		assert(this->id().valid());
+        assert(this->config.id().valid());
         assert(this->supported_facets.id().valid());
         assert(this->seam_facets.id().valid());
         assert(this->mmu_segmentation_facets.id().valid());
@@ -1169,6 +1243,8 @@ private:
         assert(this->seam_facets.empty());
         assert(this->mmu_segmentation_facets.empty());
         assert(this->fuzzy_skin_facets.empty());
+        assert(this->texture_displacement_facets_all_empty());
+        assert(this->texture_displacement_layers.empty());
     }
 
     ModelVolume& operator=(ModelVolume &rhs) = delete;
@@ -1176,13 +1252,17 @@ private:
 	friend class cereal::access;
 	friend class UndoRedo::StackImpl;
 	// Used for deserialization, therefore no IDs are allocated.
-	ModelVolume() : ObjectBase(-1), config(-1), supported_facets(-1), seam_facets(-1), mmu_segmentation_facets(-1), fuzzy_skin_facets(-1), object(nullptr) {
+	ModelVolume() : ObjectBase(-1), config(-1), supported_facets(-1), seam_facets(-1), mmu_segmentation_facets(-1), fuzzy_skin_facets(-1),
+		texture_displacement_facets_0(-1), texture_displacement_facets_1(-1), texture_displacement_facets_2(-1), texture_displacement_facets_3(-1),
+		texture_displacement_facets_4(-1), texture_displacement_facets_5(-1), texture_displacement_facets_6(-1), texture_displacement_facets_7(-1),
+		object(nullptr) {
 		assert(this->id().invalid());
         assert(this->config.id().invalid());
         assert(this->supported_facets.id().invalid());
         assert(this->seam_facets.id().invalid());
         assert(this->mmu_segmentation_facets.id().invalid());
         assert(this->fuzzy_skin_facets.id().invalid());
+        assert(this->texture_displacement_facets_ids_invalid());
 	}
 	template<class Archive> void load(Archive &ar) {
 		bool has_convex_hull;
@@ -1202,6 +1282,13 @@ private:
         mesh_changed |= t != mmu_segmentation_facets.timestamp();
         cereal::load_by_value(ar, fuzzy_skin_facets);
         mesh_changed |= t != fuzzy_skin_facets.timestamp();
+        for (int i = 0; i < int(TEXTURE_DISPLACEMENT_MAX_LAYERS); ++i) {
+            FacetsAnnotation &f  = texture_displacement_facet(i);
+            Timestamp         tf = f.timestamp();
+            cereal::load_by_value(ar, f);
+            mesh_changed |= tf != f.timestamp();
+        }
+        ar(texture_displacement_layers);
         cereal::load_by_value(ar, config);
         cereal::load(ar, text_configuration);
         cereal::load(ar, emboss_shape);
@@ -1223,6 +1310,9 @@ private:
         cereal::save_by_value(ar, seam_facets);
         cereal::save_by_value(ar, mmu_segmentation_facets);
         cereal::save_by_value(ar, fuzzy_skin_facets);
+        for (int i = 0; i < int(TEXTURE_DISPLACEMENT_MAX_LAYERS); ++i)
+            cereal::save_by_value(ar, texture_displacement_facet(i));
+        ar(texture_displacement_layers);
         cereal::save_by_value(ar, config);
         cereal::save(ar, text_configuration);
         cereal::save(ar, emboss_shape);

src/libslic3r/Preset.cpp

@@ -3504,7 +3504,7 @@ inline t_config_option_keys deep_diff(const ConfigBase &config_this, const Confi
         if (this_opt != nullptr && other_opt != nullptr && *this_opt != *other_opt)
         {
             //BBS: add bed_exclude_area
-            if (opt_key == "printable_area" || opt_key == "bed_exclude_area" || opt_key == "compatible_prints" || opt_key == "compatible_printers" || opt_key == "thumbnails" ||  opt_key == "wrapping_exclude_area") {
+            if (opt_key == "printable_area" || opt_key == "bed_exclude_area" || opt_key == "compatible_prints" || opt_key == "compatible_printers" || opt_key == "thumbnails" ||  opt_key == "wrapping_exclude_area" || opt_key == "slicing_pipeline_plugin") {
                 // Scalar variable, or a vector variable, which is independent from number of extruders,
                 // thus the vector is presented to the user as a single input.
                 diff.emplace_back(opt_key);

src/libslic3r/TextureDisplacement.hpp

@@ -0,0 +1,516 @@
+#ifndef slic3r_TextureDisplacement_hpp_
+#define slic3r_TextureDisplacement_hpp_
+
+#include <cstdint>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <cereal/cereal.hpp>
+#include <cereal/types/array.hpp> // view_project_matrix is a std::array<float, 12>
+#include <cereal/types/string.hpp>
+#include <cereal/types/vector.hpp>
+
+#include <array>
+
+#include "Point.hpp"
+#include "TriangleMesh.hpp"
+#include "TriangleSelector.hpp"
+
+namespace Slic3r {
+
+class ModelVolume;
+
+// Maximum number of simultaneous texture-displacement layers a single ModelVolume can hold.
+// Each layer owns its own paint mask (ModelVolume::texture_displacement_facet(slot)), so this
+// is also the number of independent EnforcerBlockerType selectors kept per volume.
+static constexpr size_t TEXTURE_DISPLACEMENT_MAX_LAYERS = 8;
+
+// How a layer's height texture is sampled outside its [0, 1) tile when tiling is enabled. Ignored
+// (always clamp) when TextureDisplacementLayer::tile_enabled is false.
+enum class TextureTileMethod : int
+{
+    Repeat = 0,         // wrap around, tile i and tile i+1 are identical (default)
+    MirroredRepeat = 1, // wrap around, every other tile is mirrored (no visible seam at tile edges)
+};
+
+// How a layer's texture is mapped onto the mesh.
+enum class TextureProjectionMethod : int
+{
+    // Standard *blended* tri-planar projection: the texture is sampled once per world axis (the
+    // XY, XZ and YZ planes) and the three samples are blended per vertex, weighted by that
+    // vertex's own normal raised to TRIPLANAR_BLEND_SHARPNESS.
+    //
+    // Earlier versions instead *hard-picked* the single axis most aligned with the normal. That
+    // has a real, visible failure mode at any edge where the dominant axis flips: on a +X face the
+    // planar coordinate is (y, z), on a -Y face it is (x, z), so at the shared edge u jumps from
+    // y_edge to x_edge. On a box centred near the origin those two agree at the (+,+) and (-,-)
+    // corners (making them look fine) but differ by the full corner width at the (+,-) and (-,+)
+    // corners, which is exactly the "two bad corners, two good ones" seam that was reported.
+    // Blending across the transition removes that hard discontinuity by construction.
+    Triplanar   = 0,
+    // Wrapped around an axis running through the patch's centroid. The axis itself is picked
+    // automatically as the world axis *least* aligned with the patch's average normal (since a
+    // cylinder's own axis is perpendicular to its outward radial normal) - a reasonable default
+    // for roughly cylindrical selections, not a precise fit for arbitrary geometry.
+    Cylindrical = 1,
+    // Wrapped around the patch's centroid using longitude/latitude - reasonable for roughly
+    // spherical/rounded selections, again an approximation rather than an exact geodesic map.
+    Spherical   = 2,
+    // Real UV unwrap of the painted patch - a proper low-distortion flattening rather than a
+    // planar/cylindrical/spherical approximation. The patch is first cut into charts along its
+    // sharp edges and each chart is flattened on its own (see compute_patch_unwrap()), so a patch
+    // that is not a single developable surface still unwraps sensibly. Falls back to Triplanar for
+    // any chart that cannot be flattened at all.
+    LSCM        = 3,
+    // Flat projection along a fixed direction captured from the 3D camera ("project from view"): the
+    // texture is laid onto the painted area as seen from that angle, like a decal projector. Single
+    // planar map (no per-face axis switch), so it can smear on faces turned away from the projector -
+    // that is inherent to view projection and is the user's call, not a bug. The projector's two
+    // in-plane axes live in TextureDisplacementLayer::view_project_right/up.
+    ViewProjected = 4,
+};
+
+// Dihedral angle (degrees) above which an edge between two painted triangles becomes a chart seam
+// - i.e. the unwrap is cut there rather than being forced to flatten across it.
+//
+// The whole point of this being a threshold rather than "flatten everything as one piece": three
+// faces meeting at a cube corner are not developable, so a single-chart solve has to distort them
+// badly to lie flat (they splay out into a fan, which is what "it merges all the edges into a
+// triangle" describes). Cutting at the 90-degree edges instead lets each face flatten exactly.
+// Meanwhile a smoothly curved surface - a subdivided sphere, say - has only small angles between
+// neighbouring triangles, stays a single chart, and unwraps as one piece the way it should.
+static constexpr float LSCM_DEFAULT_SEAM_ANGLE_DEG = 30.f;
+
+// Exponent the tri-planar blend weights are raised to (see TextureProjectionMethod::Triplanar).
+// Higher means a tighter, more "hard-edged" transition between the three axis projections; lower
+// means a wider cross-fade. 4 is the usual default: tight enough that a flat face is sampled
+// almost purely along its own axis, wide enough that a 90-degree edge has no visible hard seam.
+static constexpr float TRIPLANAR_BLEND_SHARPNESS = 4.f;
+
+// How a layer's displacement combines with the displacement accumulated by the layers below it
+// (i.e. those in lower slots), evaluated per vertex. Analogous to an image editor's layer blend
+// modes, except the quantity being blended is a signed displacement distance in mm rather than a
+// pixel value.
+//
+// Add/Subtract are in mm and need no further explanation. Multiply/Divide are *scaling* operations
+// and therefore need a unit convention: they treat the layer's own value as a unitless factor
+// relative to 1 mm. That makes `depth_mm` act as a gain - a layer with depth 1 mm and a white
+// (1.0) texel multiplies the accumulated relief by exactly 1, i.e. leaves it unchanged - which is
+// the behaviour that makes a Multiply layer usable as a mask over the layers beneath it.
+enum class TextureBlendMode : int
+{
+    Add      = 0, // acc + value          (default; several layers pile their relief up together)
+    Subtract = 1, // acc - value          (carve this layer's relief out of the layers below)
+    Multiply = 2, // acc * (value / 1mm)  (mask/modulate the layers below by this layer)
+    Divide   = 3, // acc / (value / 1mm)  (inverse mask; guarded against a zero/near-zero divisor)
+};
+
+// Combines one layer's signed displacement `value` (mm) into `accumulated` (mm) per `mode`.
+// Shared by the bake/preview path and exposed for tests.
+float blend_displacement(float accumulated, float value, TextureBlendMode mode);
+
+// Where one unwrap island (chart) sits in UV space, on top of wherever compute_patch_unwrap() first
+// packed it. This is what the UV editor's drag/rotate gestures write to, so a user can lay the
+// islands out by hand - move them, rotate them, overlap them - rather than being stuck with the
+// automatic packing.
+//
+// Indexed by chart id, which compute_patch_unwrap() assigns in first-encountered-triangle order. That
+// is stable for a given patch and seam angle, but *not* across a change to either: repainting the
+// patch, or moving the seam-angle slider, can renumber the charts and so leave a hand-placed island
+// applied to a different one. Accepted deliberately - the alternative is a persistent chart identity
+// that survives arbitrary re-segmentation, which is a much larger problem than this feature warrants.
+struct TextureIsland
+{
+    Vec2f offset       = Vec2f::Zero(); // in the unwrap's own mm space
+    float rotation_deg = 0.f;           // about the island's own centroid
+    // About the island's own centroid too. 1 = the size compute_patch_unwrap() gave it, which is
+    // already its true surface area in mm - so scaling an island away from 1 deliberately makes its
+    // texel density differ from its neighbours'. See average_island_scales().
+    float scale = 1.f;
+
+    template<class Archive> void serialize(Archive &ar) { ar(offset, rotation_deg, scale); }
+};
+
+// Sets every island's scale to the mean of the current ones (Blender's "Average Islands Scale").
+// Only meaningful after islands have been scaled by hand: compute_patch_unwrap() already sizes every
+// chart to its true mm area, so a freshly unwrapped patch has uniform texel density to begin with.
+void average_island_scales(std::vector<TextureIsland> &islands);
+
+// One texture asset plus its projection/displacement parameters. Several layers may be painted
+// onto overlapping areas of the same volume: their displacements are combined per vertex, in slot
+// order, each layer folding into the total via its own TextureBlendMode (see
+// build_texture_displacement()). This is what "layered/blended" texture displacement means here.
+struct TextureDisplacementLayer
+{
+    // Index into ModelVolume::texture_displacement_facets, assigned once when the layer is
+    // created. Not reused for the lifetime of the ModelVolume, so a deleted layer's slot simply
+    // becomes unused rather than being handed to a different layer.
+    int slot = -1;
+
+    std::string name;
+    // Path on the local filesystem the image was loaded from (informational; may be stale or
+    // empty, e.g. after loading a .3mf on a different machine).
+    std::string path;
+    // Path inside the .3mf archive once saved (empty until the project is saved once).
+    std::string path_in_3mf;
+    // Raw encoded image bytes. Only 8-bit grayscale PNG is understood by decode_height_texture()
+    // (libslic3r has no GUI image toolkit available); the GUI converts any imported image to that
+    // format before storing it here, so the baking code never needs to depend on wxWidgets.
+    std::shared_ptr<std::vector<unsigned char>> image_data;
+
+    float depth_mm     = 0.4f; // maximum displacement along the surface normal, in mm
+    float tiling_scale = 10.f; // size of one texture tile, in mm
+    float rotation_deg = 0.f;
+    Vec2f offset       = Vec2f::Zero();
+    bool  invert       = false;
+
+    // The height value that means "don't move this vertex". The sampled height (0..1) has this
+    // subtracted before being scaled by depth_mm, so with the default of 0 the surface only ever
+    // moves *outwards* (the classic height-map convention), while 0.5 makes mid-grey neutral and
+    // lets darker texels cut *into* the surface - an engraved-and-embossed result from one map.
+    //
+    // Cutting inward is not free: vertices move along their own normals, which converge inside a
+    // concave corner and inside a thin wall, so a large depth_mm against a small feature really can
+    // fold the surface through itself. There is no cheap way to detect that here (it needs a full
+    // self-intersection test on the displaced mesh), so the GUI warns rather than promising safety.
+    float midlevel = 0.f;
+
+    // Optional blur applied to the decoded height map before it is sampled, in [0, 1]: 0 is the raw
+    // texture, 1 the strongest blur. Softens the relief (rounds hard edges, removes speckle) without
+    // needing a pre-blurred source image. Applied in decode_height_texture(), so it feeds the true
+    // preview, the UV editor backdrop and the bake identically.
+    float smoothing = 0.f;
+
+    // Optional feathering of the displacement toward the edge of the painted patch. When enabled, the
+    // displacement is scaled down as a vertex approaches the patch boundary, so the relief blends
+    // smoothly into the surrounding surface instead of ending abruptly. `edge_smoothing_amount` in
+    // (0, 1] sets how far the fade reaches into the patch: small values only soften a thin band at the
+    // very edge, 1 fades the whole patch to nothing (the painted face comes out flat). Off by default.
+    bool  edge_smoothing        = false;
+    float edge_smoothing_amount = 0.5f;
+
+    // Only used by TextureProjectionMethod::LSCM: when set, a fresh unwrap is laid out as a connected
+    // net (adjacent charts unfolded edge-to-edge along a spanning tree, see compute_connected_net())
+    // rather than as separately packed islands. On by default. Hand-moving an island overrides its
+    // placement until the next re-unwrap.
+    bool  auto_connect_islands  = true;
+
+    // When false, the texture is sampled once (clamped to its edge pixels outside [0, 1)) instead
+    // of being repeated - useful for a single decal-like placement rather than a repeating tile.
+    bool              tile_enabled = true;
+    TextureTileMethod tile_method  = TextureTileMethod::Repeat;
+
+    TextureProjectionMethod projection_method = TextureProjectionMethod::Triplanar;
+    // Only used by TextureProjectionMethod::LSCM. See LSCM_DEFAULT_SEAM_ANGLE_DEG.
+    float                   lscm_seam_angle_deg = LSCM_DEFAULT_SEAM_ANGLE_DEG;
+    // Only used by TextureProjectionMethod::LSCM: gap left between islands by the automatic packing,
+    // in the unwrap's mm space. Negative means "auto" (a small fraction of the packed size), which is
+    // what a patch that has never had the slider touched gets.
+    float                   island_padding_mm = -1.f;
+    // Only used by TextureProjectionMethod::LSCM: edges the unwrap is forced to cut along, on top of
+    // whatever the seam angle already cuts. Each pair is an undirected edge in *mesh vertex index*
+    // space (first < second). This is what "mark seam" (manual) and "cut island" (auto) both write to.
+    // Mesh-index space, so like the paint masks these are dropped on any topology change.
+    std::vector<std::pair<int, int>> lscm_seam_edges;
+
+    // Only used by TextureProjectionMethod::ViewProjected: the projector's in-plane axes, in the
+    // volume's *local* space, captured from the camera when the user hits "Project from view". A point
+    // projects to Vec2f(dot(pos, right), dot(pos, up)) before the usual tiling/rotation/offset.
+    Vec3f view_project_right = Vec3f::UnitX();
+    Vec3f view_project_up    = Vec3f::UnitY();
+
+    // Also ViewProjected, and takes precedence over the two axes above when set: an exact *projective*
+    // map from a local-space position straight to a texture uv, written by the projection-frame overlay
+    // (the semi-transparent window dragged over the 3D view - its border becomes the uv unit square).
+    //
+    // Row-major 3x4, applied to the homogeneous point p~ = (x, y, z, 1):
+    //     uv = ( row0.p~ / row2.p~ , row1.p~ / row2.p~ )
+    // The perspective divide is the whole point. view_project_right/up can only express an *affine*
+    // projection, which matches an orthographic camera exactly but not a perspective one - under
+    // perspective the near end of a part projects larger than the far end, and no pair of axes
+    // reproduces that. Folding the camera's full projection*view*model product into one matrix does.
+    // Because a point behind the projector has row2.p~ <= 0 and no meaningful uv, sampling must check
+    // the sign rather than divide blindly; see project_uv_projective().
+    //
+    // Note this map already includes placement, so the usual tiling/rotation/offset transform is NOT
+    // applied on top of it - the window's own position and size are the placement.
+    bool                  view_project_projective = false;
+    std::array<float, 12> view_project_matrix{};
+    // Only used by TextureProjectionMethod::LSCM: hand placement of the unwrap's islands, indexed by
+    // chart id (see TextureIsland). Shorter than the chart count simply means the missing ones are
+    // still where the automatic packing put them.
+    std::vector<TextureIsland> islands;
+
+    // Only used by TextureProjectionMethod::LSCM: persistent "join" groups, indexed by chart id. Charts
+    // that share a group id move together as one in the UV editor - this is what the explicit "Join"
+    // command records (over and above placing the child next to its parent). An entry of -1, or an index
+    // past the end of the vector, means the chart is its own singleton group (moves alone). Empty means
+    // every chart is a singleton. Same chart-renumbering caveat as `islands`: a re-unwrap can reshuffle
+    // chart ids, so this is meaningful only against the unwrap it was made on.
+    std::vector<int> island_groups;
+
+    // Only used by TextureProjectionMethod::LSCM: manual per-vertex UV edits made in the UV editor's
+    // Vertex/Edge select modes. Each pair is (mesh vertex index, its overriding raw-unwrap coordinate in
+    // mm) - the *raw* unwrap position, i.e. before the island transform, so the edited vertex still
+    // moves and rotates with its island. In compute_lscm_uvs() this replaces the automatic unwrap
+    // coordinate for that vertex; in the editor it edits the displayed geometry directly. Keyed in mesh-
+    // vertex space like lscm_seam_edges (dropped on a topology change). The raw coordinate is only
+    // meaningful against the current unwrap, so a re-unwrap clears these. A mesh vertex shared by several
+    // charts (a seam vertex) settles on one, matching compute_lscm_uvs()'s single-UV-per-vertex rule.
+    std::vector<std::pair<int, Vec2f>> lscm_uv_overrides;
+
+    // How this layer folds into the displacement accumulated by the layers below it. Ignored for
+    // the lowest-slot painted layer, which has nothing beneath it to combine with (the GUI shows
+    // it as the "Base" layer and hides the control).
+    TextureBlendMode blend_mode = TextureBlendMode::Add;
+
+    bool empty() const { return !image_data || image_data->empty(); }
+
+    template<class Archive> void save(Archive &ar) const
+    {
+        std::string blob = image_data ? std::string(image_data->begin(), image_data->end()) : std::string();
+        ar(slot, name, path, path_in_3mf, blob, depth_mm, tiling_scale, rotation_deg, offset, invert, tile_enabled,
+           static_cast<int>(tile_method), static_cast<int>(projection_method), lscm_seam_angle_deg, islands,
+           static_cast<int>(blend_mode), midlevel, island_padding_mm, lscm_seam_edges, view_project_right,
+           view_project_up, smoothing, edge_smoothing, edge_smoothing_amount, auto_connect_islands, island_groups,
+           lscm_uv_overrides, view_project_projective, view_project_matrix);
+    }
+    template<class Archive> void load(Archive &ar)
+    {
+        std::string blob;
+        int         tile_method_int       = 0;
+        int         projection_method_int = 0;
+        int         blend_mode_int        = 0;
+        ar(slot, name, path, path_in_3mf, blob, depth_mm, tiling_scale, rotation_deg, offset, invert, tile_enabled,
+           tile_method_int, projection_method_int, lscm_seam_angle_deg, islands, blend_mode_int, midlevel,
+           island_padding_mm, lscm_seam_edges, view_project_right, view_project_up, smoothing, edge_smoothing,
+           edge_smoothing_amount, auto_connect_islands, island_groups, lscm_uv_overrides, view_project_projective,
+           view_project_matrix);
+        image_data        = blob.empty() ? nullptr : std::make_shared<std::vector<unsigned char>>(blob.begin(), blob.end());
+        tile_method       = static_cast<TextureTileMethod>(tile_method_int);
+        projection_method = static_cast<TextureProjectionMethod>(projection_method_int);
+        blend_mode        = static_cast<TextureBlendMode>(blend_mode_int);
+    }
+};
+
+// Decoded 8-bit grayscale height sample, independent of any GUI/OpenGL texture object so it can
+// be evaluated from a background bake Job as well as from GUI-side preview code.
+struct DecodedHeightTexture
+{
+    std::vector<uint8_t> pixels; // row-major, top-to-bottom, one byte per pixel
+    int width  = 0;
+    int height = 0;
+
+    bool empty() const { return width <= 0 || height <= 0 || pixels.empty(); }
+    // Bilinearly sampled height in [0, 1] at a normalized uv coordinate. When tile_enabled is false,
+    // a uv outside [0, 1) samples as 0 - the texture simply is not there, rather than its border
+    // row/column being smeared outward forever (which is what clamping the coordinate would do, and
+    // was a real reported bug). Callers rely on this to get a hard edge: it is how the projection
+    // frame's border becomes the edge of the displacement.
+    float sample(const Vec2f &uv, bool tile_enabled = true, TextureTileMethod tile_method = TextureTileMethod::Repeat) const;
+};
+
+// Decode a layer's raw image bytes into sampleable grayscale height data. Returns an empty
+// DecodedHeightTexture if image_data is empty or is not an 8-bit grayscale PNG.
+DecodedHeightTexture decode_height_texture(const TextureDisplacementLayer &layer);
+
+// Raw dominant-axis planar projection of `position` (in mm, not yet scaled/rotated/offset by any
+// layer), dropping the axis position that best aligns with `normal`. Exposed on its own (rather
+// than only inline inside project_texture_displacement_uv()) so GUI code - the on-canvas
+// "adjust texture placement" gizmo - can map a dragged 3D point into the exact same 2D space
+// tiling_scale/rotation_deg/offset operate in, without duplicating the axis-selection logic.
+Vec2f project_planar(const Vec3f &position, const Vec3f &normal);
+
+// Applies a layer's tiling_scale/rotation_deg/offset to an already-projected planar coordinate
+// (in mm, dominant-axis planar, cylindrical, spherical, or CGAL LSCM output - any of them, all
+// share this same final step). Exposed separately so build_texture_displacement() can route CGAL
+// LSCM's per-patch UV solve through the same scale/rotate/offset controls as every other
+// projection method, without going through project_texture_displacement_uv()'s own dispatch
+// (which only knows how to compute the *analytic* methods from a single vertex + normal).
+Vec2f apply_uv_transform(const Vec2f &planar, const TextureDisplacementLayer &layer);
+
+// Applies a row-major 3x4 projective matrix (see TextureDisplacementLayer::view_project_matrix) to a
+// local-space point, writing the resulting texture uv. Returns false - and leaves `uv` untouched -
+// when the point lies behind the projector or on its plane (w <= 0), where there is no meaningful uv
+// and dividing would produce a mirrored or infinite coordinate. Callers treat that as "no height".
+bool project_uv_projective(const std::array<float, 12> &m, const Vec3f &position, Vec2f &uv);
+
+// Sample a layer's height texture at a mesh-local position, honouring the layer's projection
+// method, tiling scale, rotation, offset and tiling mode. Returns a height in [0, 1].
+//
+// This returns a *height* rather than a UV because TextureProjectionMethod::Triplanar is a blend
+// of three separate axis projections and therefore takes three texture samples per vertex - there
+// is no single UV that represents it. The other methods do map to one UV internally.
+//   - `normal` is this specific vertex's own normal; used only by Triplanar (for its blend weights).
+//   - `patch_center`/`patch_axis` describe the painted patch as a whole (its centroid, and - for
+//     Cylindrical only - the wrap axis); used only by the Cylindrical/Spherical methods.
+//   - `lscm_uv`, when non-null, is this vertex's precomputed LSCM coordinate and takes precedence
+//     over `layer.projection_method` (LSCM is a single per-patch solve, not a per-vertex formula,
+//     so build_texture_displacement() computes it once up front and passes it in here).
+// patch_center/patch_axis are cheap to compute once per patch and passed through unchanged for
+// every vertex rather than being re-derived per call.
+float sample_layer_height(const DecodedHeightTexture &texture, const TextureDisplacementLayer &layer,
+                          const Vec3f &position, const Vec3f &normal,
+                          const Vec3f &patch_center = Vec3f::Zero(), const Vec3f &patch_axis = Vec3f::UnitZ(),
+                          const Vec2f *lscm_uv = nullptr);
+
+// Area-weighted centroid and average normal of a layer's currently painted patch, in mesh-local
+// coordinates - the same measurements build_texture_displacement() uses to pick its dominant
+// projection axis. Used by the GUI to anchor the on-canvas "adjust texture placement" gizmo to
+// wherever the layer is actually painted. Returns false (leaving the outputs untouched) if the
+// layer has nothing painted yet.
+bool compute_layer_paint_anchor(const indexed_triangle_set                    &base_mesh,
+                                 const TriangleSelector::TriangleSplittingData &facet_data,
+                                 Vec3f                                         &anchor_pos,
+                                 Vec3f                                         &anchor_normal);
+
+// Extracts the currently painted patch from a volume's base mesh + stored facet data - the same
+// extraction build_texture_displacement() and compute_layer_paint_anchor() each do internally via
+// TriangleSelector::get_facets_strict(ENFORCER). Returns an empty mesh if nothing is painted.
+// Exposed so GUI code (the LSCM "UV editor" preview pane) can get the same patch build_texture_
+// displacement() would act on, without duplicating the deserialize/get_facets_strict boilerplate.
+indexed_triangle_set extract_painted_patch(const indexed_triangle_set                    &base_mesh,
+                                            const TriangleSelector::TriangleSplittingData &facet_data);
+
+// A patch flattened into 2D. The patch is first split into charts along edges sharper than
+// `seam_angle_deg` (see LSCM_DEFAULT_SEAM_ANGLE_DEG), each chart is flattened independently, the
+// charts are scaled to their true mm size and packed side by side.
+//
+// A vertex sitting on a seam belongs to several charts at once and therefore has a *different* UV
+// in each of them, so this cannot be a plain "one UV per patch vertex" array: seam vertices are
+// duplicated, once per chart touching them. `indices` is the patch's own triangle list re-indexed
+// onto that duplicated vertex set, and `source_vertex` maps each duplicate back to the patch vertex
+// it came from.
+struct PatchUnwrap
+{
+    std::vector<Vec2f>                       uvs;           // one per unwrapped vertex, in mm
+    std::vector<int>                         source_vertex; // unwrapped vertex -> index into patch.vertices
+    std::vector<int>                         vertex_chart;  // unwrapped vertex -> chart (island) id
+    std::vector<stl_triangle_vertex_indices> indices;       // patch triangles, re-indexed into `uvs`
+    // Per chart, the centroid of its uvs - the point a TextureIsland's rotation turns about.
+    std::vector<Vec2f> chart_centroid;
+    // Edges belonging to exactly one triangle: the outline of each island. Indices into `uvs`. This
+    // is what the UV editor draws highlighted, so the boundaries the seam angle cut are visible.
+    std::vector<std::pair<int, int>> boundary_edges;
+    int                              chart_count = 0;
+
+    bool empty() const { return indices.empty(); }
+};
+
+// Applies an island's hand placement (scale + rotation about its own centroid, then offset) to one
+// unwrapped UV. A chart with no entry in `islands` is left exactly where the packing put it.
+Vec2f apply_island_transform(const Vec2f &uv, int chart, const PatchUnwrap &unwrap, const std::vector<TextureIsland> &islands);
+
+// The same transform as a 2x3 affine matrix (columns: x basis, y basis, translation), for callers
+// that would otherwise apply it to every vertex of an island one at a time. The UV editor renders
+// each island through this as a uniform, which is what lets a drag move an island without touching
+// its vertex buffer at all.
+Eigen::Matrix<float, 2, 3> island_transform_matrix(int chart, const PatchUnwrap &unwrap, const std::vector<TextureIsland> &islands);
+
+// Lays the unwrap's charts out as a connected net: charts that share a mesh edge are unfolded so
+// their shared edge coincides (a cube -> its six faces joined along a spanning tree of edges, the rest
+// left as free borders). Charts stay separate islands, so their borders still show and any of them can
+// still be moved by hand afterwards. A chart whose unfold would overlap one already placed is left
+// where the packing put it. Returns one placement per chart. See the gizmo's auto-connect option.
+std::vector<TextureIsland> compute_connected_net(const PatchUnwrap &unwrap);
+
+// The placement that unfolds `child` onto `parent` along their shared mesh edge, honouring `parent`'s
+// current placement in `islands`. Returns false if the two charts share no edge. Backs the manual
+// "Join" command; compute_connected_net() does the same thing across a whole spanning tree.
+bool join_chart_placement(const PatchUnwrap &unwrap, const std::vector<TextureIsland> &islands,
+                          int child, int parent, TextureIsland &out_child);
+
+// Unwraps `patch` as described above. Charts that are flat (within a degree) are projected onto
+// their own tangent plane directly, which is both exact and far cheaper than a solve; only genuinely
+// curved charts go through CGAL's LSCM parameterizer (MeshBoolean::cgal::parameterize_lscm()). A
+// chart that LSCM cannot flatten at all (it is not a topological disk - closed, or with a hole)
+// falls back to that same tangent-plane projection.
+//
+// `padding_mm` is the gap the packing leaves between islands; negative means auto (see
+// TextureDisplacementLayer::island_padding_mm). `seam_edges` are extra edges to cut along regardless
+// of angle (manual/auto seams), in the patch's own vertex-index space (which is the mesh's, since the
+// patch carries the whole vertex array - see get_facets_strict()).
+//
+// Results are cached, keyed on the patch's geometry, the seam angle, the padding and the seam edges:
+// nothing else about a layer (depth, tiling, rotation, offset, texture, island placement) changes the
+// unwrap, so dragging any of those sliders must not pay for a re-solve.
+PatchUnwrap compute_patch_unwrap(const indexed_triangle_set &patch, float seam_angle_deg = LSCM_DEFAULT_SEAM_ANGLE_DEG,
+                                 float padding_mm = -1.f, const std::vector<std::pair<int, int>> &seam_edges = {});
+
+// One UV per patch vertex, for displacement. Displacement is inherently per-vertex - a vertex has
+// exactly one position, so it can only be pushed out by one height - which means a seam vertex has
+// to settle on a single one of its charts' UVs (the first, arbitrarily). That is not a compromise
+// in the result: the surface stays watertight either way, since neighbouring vertices each move
+// along their own normals and nothing depends on the UVs agreeing across the seam. It is only the
+// *display* in the UV editor that needs the duplicated-vertex form above.
+//
+// Returns an empty vector if the patch has no triangles. Takes the whole layer because it applies
+// both the layer's seam angle and its hand-placed islands.
+std::vector<Vec2f> compute_lscm_uvs(const indexed_triangle_set &patch, const TextureDisplacementLayer &layer);
+
+// One paint mask (as stored by ModelVolume::texture_displacement_facets) per possible layer slot.
+using TextureDisplacementFacetsData = std::array<TriangleSelector::TriangleSplittingData, TEXTURE_DISPLACEMENT_MAX_LAYERS>;
+
+// Bake all painted texture-displacement layers into `base_mesh`'s geometry, restricted to the
+// painted area(s) only (the rest of the mesh is left untouched). Returns the mesh unchanged if
+// nothing is painted or no layer has a usable texture.
+//
+// **Topology-preserving**: the returned mesh has exactly `base_mesh`'s vertices and triangles, in
+// the same order - only the positions of displaced vertices differ. Every layer's paint mask is
+// evaluated against `base_mesh` directly, and each vertex accumulates a single signed displacement
+// (in mm) that all the layers covering it fold into, in slot order, via their TextureBlendMode.
+// The vertex is then moved once, along its base-mesh normal, by that accumulated total.
+//
+// This replaced an earlier design that instead applied the layers *sequentially*, re-meshing after
+// each one and carrying the next layer's paint mask onto the result with
+// TriangleSelector::remap_painting(). That was the cause of a real "the second texture is never
+// applied" bug: remapping a mask onto a mesh whose vertices had just been displaced out from under
+// it routinely produced an empty bitstream, and the layer was then silently skipped. It is also
+// what forced the per-layer vertex duplication and the final its_compactify_vertices() pass. The
+// accumulate-then-displace formulation has neither problem, is substantially faster (no remap, no
+// welding, one pass over the mesh), and - because the output keeps the input's exact vertex
+// indexing - lets the GUI overlay a preview on the base mesh without any index translation.
+//
+// A vertex used by even one *unpainted* triangle of a layer's mask is that layer's boundary: its
+// displacement is pinned to zero, so the patch never tears away from the surrounding surface. Only
+// vertices used exclusively by painted triangles move.
+//
+// Takes plain copied data rather than a ModelVolume reference so it is safe to call from a
+// background thread (e.g. a bake Job's process() method) on a snapshot captured on the main
+// thread, without touching the live Model concurrently with the UI.
+//
+// Known limitation: this does not attempt to remap texture-displacement paint data across
+// topology-changing operations performed outside this gizmo (e.g. ModelObject::split(),
+// mesh-boolean ops) the way TriangleSelector::remap_painting() does for the other paint channels.
+// Such operations will silently drop any unbaked texture-displacement paint on the affected
+// volume. This is an explicit extension point for a later phase, not an oversight.
+indexed_triangle_set build_texture_displacement(const indexed_triangle_set              &base_mesh,
+                                                 const std::vector<TextureDisplacementLayer> &layers,
+                                                 const TextureDisplacementFacetsData         &facets_data);
+
+// Convenience overload for main-thread callers: extracts the mesh/layers/paint data from `volume`
+// and forwards to the overload above.
+indexed_triangle_set build_texture_displacement(const ModelVolume &volume);
+
+// Uniformly subdivides `mesh` (every triangle recursively split into 4 via edge midpoints, using a
+// shared cache so a midpoint is computed once and reused by both triangles on either side of that
+// edge) until every edge is at or below max_edge_length_mm, or max_iterations passes have run,
+// whichever comes first (bounding the worst-case triangle-count explosion on a very fine target).
+//
+// This exists so a low-poly input model can still get fine-grained texture displacement detail -
+// build_texture_displacement() can only ever move existing vertices, so a patch with only a
+// handful of vertices to begin with cannot show much detail no matter the texture's resolution.
+//
+// Deliberately whole-mesh and uniform, not limited to a painted patch: subdividing only part of a
+// mesh while leaving the rest untouched creates a classic T-junction/cracking problem where the
+// denser and sparser regions meet (the finer side has edge midpoints the coarser side doesn't
+// know about). Uniform, whole-mesh subdivision has no such seam and stays manifold, at the cost of
+// applying everywhere rather than just where texture detail is actually wanted - meant to be run
+// once, deliberately, before painting (see the gizmo's "Subdivide model" button), not automatically
+// during baking.
+indexed_triangle_set subdivide_mesh_uniform(const indexed_triangle_set &mesh, float max_edge_length_mm, int max_iterations = 6);
+
+} // namespace Slic3r
+
+#endif // slic3r_TextureDisplacement_hpp_

src/slic3r/CMakeLists.txt

@@ -198,6 +198,8 @@ set(SLIC3R_GUI_SOURCES
     GUI/Gizmos/GLGizmosManager.hpp
     GUI/Gizmos/GLGizmoSVG.cpp
     GUI/Gizmos/GLGizmoSVG.hpp
+    GUI/Gizmos/GLGizmoTextureDisplacement.cpp
+    GUI/Gizmos/GLGizmoTextureDisplacement.hpp
     GUI/Gizmos/GLGizmoUtils.cpp
     GUI/Gizmos/GLGizmoUtils.hpp
     #GUI/Gizmos/GLGizmoText.cpp
@@ -323,6 +325,10 @@ set(SLIC3R_GUI_SOURCES
     GUI/Jobs/SLAImportDialog.hpp
     GUI/Jobs/SLAImportJob.cpp
     GUI/Jobs/SLAImportJob.hpp
+    GUI/Jobs/TextureDisplacementBakeJob.cpp
+    GUI/Jobs/TextureDisplacementBakeJob.hpp
+    GUI/Jobs/TextureDisplacementPreviewJob.cpp
+    GUI/Jobs/TextureDisplacementPreviewJob.hpp
     GUI/Jobs/ThreadSafeQueue.hpp
     GUI/Jobs/UpgradeNetworkJob.cpp
     GUI/Jobs/UpgradeNetworkJob.hpp
@@ -494,6 +500,10 @@ set(SLIC3R_GUI_SOURCES
     GUI/TaskManager.hpp
     GUI/TextLines.cpp
     GUI/TextLines.hpp
+    GUI/TextureLibrary.cpp
+    GUI/TextureLibrary.hpp
+    GUI/TextureProjectorFrame.cpp
+    GUI/TextureProjectorFrame.hpp
     GUI/TickCode.cpp
     GUI/TickCode.hpp
     GUI/TroubleshootDialog.cpp
@@ -510,6 +520,8 @@ set(SLIC3R_GUI_SOURCES
     GUI/UserManager.hpp
     GUI/UserNotification.cpp
     GUI/UserNotification.hpp
+    GUI/UVEditorCanvas.cpp
+    GUI/UVEditorCanvas.hpp
     GUI/WebDownPluginDlg.cpp
     GUI/WebDownPluginDlg.hpp
     GUI/WebGuideDialog.cpp

src/slic3r/GUI/GLShadersManager.cpp

@@ -104,6 +104,11 @@ std::pair<bool, std::string> GLShadersManager::init()
         valid &= append_shader("mm_gouraud", { prefix + "mm_gouraud.vs", prefix + "mm_gouraud.fs" }, { "FLIP_TRIANGLE_NORMALS"sv });
     else
         valid &= append_shader("mm_gouraud", { prefix + "mm_gouraud.vs", prefix + "mm_gouraud.fs" });
+    // Fast bump-map preview for the texture displacement gizmo (see libslic3r/TextureDisplacement.hpp).
+    valid &= append_shader("texture_displacement_bump", { prefix + "texture_displacement_bump.vs", prefix + "texture_displacement_bump.fs" });
+    // UV-check overlay for the same gizmo: a procedural checker or a distortion heatmap over the
+    // painted patch, to sanity-check the unwrap.
+    valid &= append_shader("texture_displacement_uvcheck", { prefix + "texture_displacement_uvcheck.vs", prefix + "texture_displacement_uvcheck.fs" });
 
     return { valid, error };
 }

src/slic3r/GUI/GLTexture.cpp

@@ -171,7 +171,8 @@ bool GLTexture::load_from_svg_file(const std::string& filename, bool use_mipmaps
         return false;
 }
 
-bool GLTexture::load_from_raw_data(std::vector<unsigned char> data, unsigned int w, unsigned int h, bool apply_anisotropy)
+bool GLTexture::load_from_raw_data(std::vector<unsigned char> data, unsigned int w, unsigned int h, bool apply_anisotropy,
+                                   bool use_mipmaps)
 {
     m_width = w;
     m_height = h;
@@ -195,18 +196,51 @@ bool GLTexture::load_from_raw_data(std::vector<unsigned char> data, unsigned int
 
     glsafe(::glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)m_width, (GLsizei)m_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, (const void*)data.data()));
 
-    bool use_mipmaps = true;
     if (use_mipmaps) {
-        // we manually generate mipmaps because glGenerateMipmap() function is not reliable on all graphics cards
-        int lod_w = m_width;
-        int lod_h = m_height;
+        // We generate the mipmap chain ourselves rather than calling glGenerateMipmap(), which this
+        // codebase has historically considered unreliable on some graphics cards.
+        //
+        // Each level is a 2x2 box filter of the level above it. Note this used to re-upload the
+        // *level-0* buffer at every level instead, which does not downscale anything - it just
+        // reinterprets the image's first lod_w * lod_h texels as the whole smaller level, i.e. every
+        // level below 0 held a crop of the top-left corner. It went unnoticed for as long as every
+        // caller drew these textures at roughly their native size (where only level 0 is ever
+        // sampled); it shows up the moment one is drawn small enough to select a lower level, as a
+        // texture that visibly turns into something else as it shrinks.
+        std::vector<unsigned char> scratch;
+        const std::vector<unsigned char> *src = &data;
+        int src_w = m_width;
+        int src_h = m_height;
         GLint level = 0;
-        while (lod_w > 1 || lod_h > 1) {
+        while (src_w > 1 || src_h > 1) {
             ++level;
-            lod_w = std::max(lod_w / 2, 1);
-            lod_h = std::max(lod_h / 2, 1);
-            n_pixels = lod_w * lod_h;
-            glsafe(::glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, (GLsizei)lod_w, (GLsizei)lod_h, 0, GL_RGBA, GL_UNSIGNED_BYTE, (const void*)data.data()));
+            const int lod_w = std::max(src_w / 2, 1);
+            const int lod_h = std::max(src_h / 2, 1);
+
+            std::vector<unsigned char> lod(size_t(lod_w) * size_t(lod_h) * 4);
+            for (int y = 0; y < lod_h; ++y) {
+                // min() rather than a plain 2*y+1: an odd source extent leaves the last output texel
+                // with only one source row/column to average, not two.
+                const int y0 = std::min(2 * y, src_h - 1);
+                const int y1 = std::min(2 * y + 1, src_h - 1);
+                for (int x = 0; x < lod_w; ++x) {
+                    const int x0 = std::min(2 * x, src_w - 1);
+                    const int x1 = std::min(2 * x + 1, src_w - 1);
+                    for (int c = 0; c < 4; ++c) {
+                        const unsigned int sum = (*src)[(size_t(y0) * size_t(src_w) + size_t(x0)) * 4 + size_t(c)] +
+                                                 (*src)[(size_t(y0) * size_t(src_w) + size_t(x1)) * 4 + size_t(c)] +
+                                                 (*src)[(size_t(y1) * size_t(src_w) + size_t(x0)) * 4 + size_t(c)] +
+                                                 (*src)[(size_t(y1) * size_t(src_w) + size_t(x1)) * 4 + size_t(c)];
+                        lod[(size_t(y) * size_t(lod_w) + size_t(x)) * 4 + size_t(c)] = (unsigned char)(sum / 4);
+                    }
+                }
+            }
+            glsafe(::glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA, (GLsizei)lod_w, (GLsizei)lod_h, 0, GL_RGBA, GL_UNSIGNED_BYTE, (const void*)lod.data()));
+
+            scratch = std::move(lod);
+            src     = &scratch;
+            src_w   = lod_w;
+            src_h   = lod_h;
         }
 
         glsafe(::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, level));

src/slic3r/GUI/GLTexture.hpp

@@ -100,7 +100,10 @@ namespace GUI {
         bool load_from_file(const std::string& filename, bool use_mipmaps, ECompressionType compression_type, bool apply_anisotropy);
         bool load_from_svg_file(const std::string& filename, bool use_mipmaps, bool compress, bool apply_anisotropy, unsigned int max_size_px);
         //BBS load GLTexture from raw pixel data
-        bool load_from_raw_data(std::vector<unsigned char> data, unsigned int w, unsigned int h, bool apply_anisotropy = false);
+        // `data` is RGBA, w * h * 4 bytes. With use_mipmaps, a real box-filtered mipmap chain is
+        // built, so the texture may safely be drawn smaller than its pixel size.
+        bool load_from_raw_data(std::vector<unsigned char> data, unsigned int w, unsigned int h, bool apply_anisotropy = false,
+                                bool use_mipmaps = true);
         // meanings of states: (std::pair<int, bool>)
         // first field (int):
         // 0 -> no changes

src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp

@@ -27,7 +27,8 @@ enum class PainterGizmoType {
     FDM_SUPPORTS,
     SEAM,
     MM_SEGMENTATION,
-    FUZZY_SKIN
+    FUZZY_SKIN,
+    TEXTURE_DISPLACEMENT
 };
 
 class TriangleSelectorGUI : public TriangleSelector {

src/slic3r/GUI/Gizmos/GLGizmoTextureDisplacement.hpp

@@ -0,0 +1,518 @@
+#ifndef slic3r_GLGizmoTextureDisplacement_hpp_
+#define slic3r_GLGizmoTextureDisplacement_hpp_
+
+#include "GLGizmoPainterBase.hpp"
+#include "libslic3r/TextureDisplacement.hpp"
+#include "slic3r/GUI/GLModel.hpp"
+#include "slic3r/GUI/GLTexture.hpp"
+#include "slic3r/GUI/I18N.hpp"
+#include "slic3r/GUI/IconManager.hpp"
+#include "slic3r/GUI/TextureLibrary.hpp"
+
+#include <array>
+#include <map>
+#include <memory>
+#include <string>
+
+namespace Slic3r::GUI {
+
+class TextureProjectorFrame;
+
+// Paint-style gizmo that assigns one or more texture-displacement "layers" (see
+// libslic3r/TextureDisplacement.hpp) to painted areas of a model, and can bake the result into
+// real mesh geometry. See the project plan for the overall architecture; in short:
+//  - each layer owns its own independent paint mask (ModelVolume::texture_displacement_facets),
+//    reusing the same TriangleSelector/FacetsAnnotation machinery as every other paint gizmo -
+//    only one layer is "active" (paintable) at a time, selected in the panel below;
+//  - "Bake" runs build_texture_displacement() in a background job and commits the result exactly
+//    like the Emboss/SVG "project on surface" gizmo does.
+class GLGizmoTextureDisplacement : public GLGizmoPainterBase
+{
+public:
+    GLGizmoTextureDisplacement(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id);
+
+    void render_painter_gizmo() override;
+
+    // Intercepts mouse input while "Adjust Texture" mode is on (dragging the on-canvas offset/
+    // rotation handles instead of painting); otherwise forwards to the normal painting handling.
+    bool on_mouse(const wxMouseEvent &mouse_event) override;
+
+protected:
+    void        on_render_input_window(float x, float y, float bottom_limit) override;
+    std::string on_get_name() const override;
+
+    wxString handle_snapshot_action_name(bool shift_down, Button button_down) const override;
+
+    std::string get_gizmo_entering_text() const override { return _u8L("Entering Texture displacement painting"); }
+    std::string get_gizmo_leaving_text() const override { return _u8L("Leaving Texture displacement painting"); }
+    std::string get_action_snapshot_name() const override { return _u8L("Texture displacement editing"); }
+
+    EnforcerBlockerType get_left_button_state_type() const override { return EnforcerBlockerType::ENFORCER; }
+    EnforcerBlockerType get_right_button_state_type() const override { return EnforcerBlockerType::NONE; }
+
+private:
+    bool on_init() override;
+    void update_model_object() override;
+    void update_from_model_object(bool first_update) override;
+    void on_opening() override {}
+    void on_shutdown() override;
+    PainterGizmoType get_painter_type() const override;
+
+    // Phase 1 restricts the texture layer list to the first model-part volume of the current
+    // object (the common single-volume case); multi-part objects only get texture layers on
+    // their first part until a later phase. Returns nullptr if there is no model part.
+    ModelVolume*       texture_volume();
+    const ModelVolume* texture_volume() const;
+
+    void add_texture_layer();
+    void remove_texture_layer(int slot);
+    void set_active_layer(int slot); // flushes the previous layer's edits, then reloads selectors
+    void bake();
+
+    // Marks every facet of every model-part volume as painted for the currently active layer -
+    // "whole model" as an alternative to brushing/clicking every triangle by hand.
+    void select_whole_model();
+
+    // The mesh raycasters are built one per model-part volume, in that order; this is the texture
+    // volume's slot among them, or -1 if it has none (no selection, or the lists disagree).
+    int texture_volume_raycaster_index() const;
+
+    // Paints exactly the facets currently visible from the camera onto the active layer, replacing
+    // whatever that layer had painted. "Visible" is two tests: the facet faces the camera, and its
+    // centroid is not hidden behind other geometry (a real raycast, so a concave part's far inner
+    // wall is correctly excluded). When `uv_clip` is given (the projection frame's matrix), facets
+    // whose centroid falls outside the frame's uv unit square are skipped first - which both clips
+    // the selection to the frame and spares the raycast for everything outside it. Costs one ray
+    // query per surviving facet, so it is a one-shot action, never a per-frame one. Returns the
+    // number of facets selected.
+    int select_visible_faces(const std::array<float, 12> *uv_clip = nullptr);
+
+    // When set, "Capture current view" also re-selects the visible faces, so the viewpoint the
+    // projector was captured from and the area it projects onto stay the same. Independent of the
+    // projection frame below: this takes every visible facet, the frame clips to its rectangle.
+    // Off by default, because turning it on replaces whatever the layer had painted.
+    bool m_project_only_visible = false;
+
+    // The projection-frame overlay for a ViewProjected layer: a semi-transparent window dragged over
+    // the 3D view whose border becomes the projection's edge. Created lazily and owned here; hidden
+    // rather than destroyed when closed, so reopening keeps it where the user left it.
+    TextureProjectorFrame *m_projector_frame   = nullptr;
+    int                    m_projector_opacity = 140;
+    // What the overlay's texture was last built from, so repeated updates don't rebuild the bitmap
+    // from unchanged pixels. Same shape as the m_thumbnail_source/m_thumbnail_smoothing pair above.
+    const void *m_projector_tex_source    = nullptr;
+    float       m_projector_tex_smoothing = -1.f;
+    void show_projector(bool show);
+    // Pushes the active layer's texture into the overlay. Cheap, and a no-op while it is hidden.
+    void update_projector();
+    // Reads the overlay's rectangle and commits it as the layer's projection: builds the exact
+    // projective local->uv matrix from the camera and that rectangle, turns tiling off so the border
+    // is a hard edge, and repaints the layer with the visible facets inside the frame. Returns the
+    // number of facets selected, or -1 if the frame could not be used at all.
+    int apply_projection_frame();
+
+    // Uniformly subdivides the volume's mesh (see libslic3r::subdivide_mesh_uniform()) so a
+    // low-poly input model has enough vertices to actually show texture-displacement detail.
+    // A real, committed geometry change (like Bake), so it needs its own snapshot; unlike Bake it
+    // has no target region, so any not-yet-baked paint on the volume is dropped rather than
+    // remapped (texture-displacement paint has no remap-across-topology-change support yet).
+    void subdivide_model();
+
+    // Returns a cached GPU thumbnail of layer's texture (decoding + uploading it the first time it
+    // is requested, or whenever its image_data changes), or nullptr if it has no usable texture.
+    GLTexture *get_layer_thumbnail(const TextureDisplacementLayer &layer);
+
+    // A texture from the picker's library (see slic3r/GUI/TextureLibrary.hpp), read and uploaded
+    // once and then kept for the gizmo's lifetime. The decoded bytes are held alongside the GPU
+    // thumbnail so that picking the texture can hand the layer this very same image_data buffer -
+    // which both avoids re-reading the file and lets decode_height_texture()'s own cache (keyed by
+    // exactly this pointer) hit immediately on the first bake/preview.
+    struct LibraryTexture
+    {
+        std::shared_ptr<std::vector<unsigned char>> image_data;
+        std::unique_ptr<GLTexture>                  thumbnail;
+    };
+    const LibraryTexture *get_library_texture(const std::string &path);
+
+    // The layer's texture chooser: a drop-down whose closed state and every one of whose entries
+    // shows a large preview image on the left and the texture's name on the right, plus an adjacent
+    // button that imports an image file from disk into the user texture folder. Shipped and
+    // user-imported textures are listed under separate headings.
+    void render_texture_picker(TextureDisplacementLayer &layer);
+    void set_layer_texture(TextureDisplacementLayer &layer, const TextureLibraryEntry &entry);
+    void import_custom_texture(TextureDisplacementLayer &layer);
+    // Draws a picker row (image left, name right) on top of a full-width Selectable, and leaves the
+    // cursor below it. Shared by the drop-down's closed state and its individual entries so the two
+    // cannot drift apart. Returns true when the row is clicked.
+    bool  texture_row(const char *id, const std::string &name, GLTexture *thumbnail, bool selected, float width);
+    float texture_row_height() const;
+
+    // "Adjust Texture" mode: instead of painting, dragging an on-canvas handle changes the active
+    // layer's offset. The handle is a flat panel lying in the paint patch's own tangent plane
+    // (a "pan" - drag anywhere on it for free 2D movement), plus two arrows along the patch's
+    // own U/V axes that constrain the drag to just that one axis for precise nudging. Anchored to
+    // the centroid/average-normal of the active layer's current paint patch (see
+    // libslic3r::compute_layer_paint_anchor()), so nothing is drawn if it has nothing painted yet.
+    //
+    // NOTE: the drag direction/sign below is this session's best-effort reasoning about which way
+    // the texture should appear to move as the handle is dragged - it could not be visually
+    // confirmed while writing it (no way to render/see pixels in this environment), so it may
+    // need a one-line sign flip once actually tested.
+    bool update_adjust_anchor(); // recomputes m_adjust_anchor_pos/normal; false if nothing painted
+    bool on_mouse_adjust_texture(const wxMouseEvent &mouse_event);
+    void render_adjust_texture_gizmo();
+    // Draws a small '+'/'-' next to the mouse over the 3D view while painting/selecting, so it is
+    // obvious whether the next stroke adds paint (default) or erases it (Shift). Uses ImGui's
+    // foreground draw list, so it must be called from inside the gizmo's ImGui frame.
+    void render_paint_cursor_hint();
+    // Mesh-local tangent-plane basis at m_adjust_anchor_normal, matching project_planar()'s
+    // dominant-axis convention so dragging on-canvas maps consistently onto offset.
+    void adjust_tangent_basis(Vec3f &u_axis, Vec3f &v_axis) const;
+
+    // The plane a drag is measured against: the paint patch's anchor, lifted clear of the surface.
+    // Deliberately *fixed* - independent of the layer's offset - so that moving the handle cannot
+    // move the plane the handle's own motion is derived from, which would be a feedback loop.
+    Vec3f adjust_plane_point() const;
+
+    // Where the handle is actually drawn, in mesh-local coordinates. This is NOT just the patch's
+    // centroid: the handle *represents the texture's placement*, so it has to travel as `offset`
+    // changes. Pinning it to the centroid is why dragging it looked broken - the texture slid but
+    // the handle stayed put. Undoing apply_uv_transform()'s scale and rotation turns the layer's
+    // offset back into a displacement in mm within the patch's tangent plane, which is what gets
+    // added to the anchor here. That is exactly consistent with the drag arithmetic in
+    // on_mouse_adjust_texture(): the handle then tracks the cursor 1:1, and sits back on the anchor
+    // precisely when offset is zero.
+    Vec3f adjust_handle_center(const TextureDisplacementLayer &layer) const;
+
+    // The layer painted by the active slot, or nullptr if that slot has no layer yet.
+    TextureDisplacementLayer       *active_layer();
+    const TextureDisplacementLayer *active_layer() const;
+
+    // Recomputes m_preview_glmodel from the volume's current (unbaked) paint state, using the same
+    // build_texture_displacement() algorithm as Bake. Called whenever the paint mask changes
+    // (stroke end, layer switch, undo/redo reload, post-bake refresh) rather than every frame -
+    // this is real mesh work (PNG sampling, vertex welding), not something to redo per paint stroke
+    // drag sample or idle repaint. With several painted layers this can be slow, so the actual
+    // computation runs in a background TextureDisplacementPreviewJob; this function only queues
+    // it and returns immediately, and m_preview_glmodel is updated later when it completes.
+    void rebuild_preview();
+    void render_preview_mesh();
+
+    // Alternate, GPU-only preview: perturbs shading normals from the active layer's height texture
+    // (a classic bump map) instead of actually moving vertices, using the
+    // resources/shaders/*/texture_displacement_bump.* shader. Faster than the true-displacement
+    // preview (no CPU meshing at all - just a per-vertex paint-weight buffer built at the same
+    // cadence as rebuild_preview()) but only shows the *active* layer, and any bump is a shading
+    // illusion, not real geometry - "Bake" always produces the true, exact result either way.
+    void rebuild_bump_preview_mesh();
+    void render_bump_preview_mesh();
+
+    // Feeds the active layer's painted patch + LSCM unwrap (if it's using that projection method)
+    // into Plater's docked UV-editor pane and shows it, or hides the pane if the active layer
+    // isn't using LSCM (or nothing is painted). Called whenever something that could change what
+    // the pane should show happens: paint changes, layer switch, projection method change, bake,
+    // and on shutdown (to hide it).
+    void update_uv_editor();
+
+    // Applies one island edit reported by the UV editor's drag/rotate gestures to the active layer.
+    // Deltas are incremental (see UVEditorCanvas::IslandEditFn); `finished` ends the gesture, which
+    // is when - and only when - the 3D preview is rebuilt, since doing that per mouse-move would
+    // queue a mesh recompute for every pixel of a drag.
+    void on_island_edited(int island, const Vec2f &offset_delta, float rotation_delta, float scale_factor, bool finished);
+    // Applies a committed vertex/edge edit from the UV editor's Vertex/Edge modes: each entry is an
+    // unwrapped-vertex index and its new raw-unwrap coordinate. Maps the unwrapped index to a mesh
+    // vertex and stores a per-vertex UV override on the layer (see lscm_uv_overrides), then rebuilds the
+    // preview so the baked geometry follows.
+    void on_uv_vertex_edited(const std::vector<std::pair<int, Vec2f>> &edits);
+    // UV-editor sub-element select mode, mirrored into the canvas: 0 = Island, 1 = Vertex, 2 = Edge.
+    int  m_uv_select_mode = 0;
+    // One affine per island (columns: x basis, y basis, translation), mapping the unwrap's raw mm
+    // coordinates to texture UVs - the same type as UVEditorCanvas::IslandTransform, spelled out
+    // here so this header needn't drag in wxGLCanvas/glad. Cheap to recompute (it is per *island*,
+    // not per vertex), which is what lets an island drag update the pane without re-uploading a
+    // single vertex.
+    std::vector<Eigen::Matrix<float, 2, 3>> uv_editor_island_transforms(const TextureDisplacementLayer &layer);
+    // Handles a toolbar command forwarded from the UV pane that needs the layer data the canvas
+    // doesn't hold (average island scale, cut island). Takes the command as an int (a cast of
+    // UVEditorCanvas::Command) so this header needn't pull in glad/wxGLCanvas via the canvas header.
+    void on_uv_command(int cmd);
+    // Splits one unwrap chart in two by marking the mesh edges that straddle the plane through its
+    // 3D centroid, perpendicular to its longest axis, as seams (#17). The re-unwrap then separates it.
+    void cut_island(TextureDisplacementLayer &layer, int chart);
+
+    // Captures the current camera's right/up axes into the layer's projector (#6), transformed into
+    // the volume's local space so the projection is stable as the object is later moved/rotated.
+    void capture_view_projection(TextureDisplacementLayer &layer);
+
+    // Manual seam marking (#9): a mode where clicking the model toggles the nearest mesh edge in the
+    // active layer's lscm_seam_edges, so the unwrap can be cut exactly where the user wants - the
+    // Blender "mark seam" workflow. Painting is suppressed while it is on.
+    bool    m_seam_edit_mode = false;
+    GLModel m_seam_glmodel; // the current seam edges, highlighted on the mesh
+    bool    on_mouse_seam(const wxMouseEvent &mouse_event);
+    void    toggle_seam_at(const Vec2d &mouse_pos);
+    void    rebuild_seam_overlay();
+    void    render_seam_overlay();
+    // The mesh edge nearest the mouse, in the volume's own vertex indices, or {-1,-1} if the ray misses.
+    // Factored out of toggle_seam_at() so the same pick can drive a live hover highlight (below) that
+    // shows which edge a click would toggle - the "I don't know how it works" feedback the user hit.
+    std::pair<int, int> seam_edge_at(const Vec2d &mouse_pos) const;
+    std::pair<int, int> m_seam_hover_edge{ -1, -1 };
+    // The vertex a click would pick in shortest-path mode, so the target is visible on hover the same
+    // way the edge is in normal mode. -1 when nothing is under the cursor (or not in path mode).
+    int                 m_seam_hover_vertex = -1;
+    GLModel             m_seam_hover_glmodel;
+    void                rebuild_seam_hover_overlay();
+
+    // Shortest-path seam marking, for dense meshes where clicking every single triangle edge is
+    // tedious: in this sub-mode a click picks the nearest vertex, and the next click marks every edge
+    // on the shortest surface path between the two as a seam - so a whole seam line is drawn with two
+    // clicks. The end vertex becomes the next start, so a multi-segment seam chains click by click.
+    bool    m_seam_path_mode   = false;
+    int     m_seam_path_anchor = -1;      // mesh vertex the path starts from, or -1
+    GLModel m_seam_anchor_glmodel;        // the anchor's incident edges, highlighted
+    int     seam_vertex_at(const Vec2d &mouse_pos) const;    // nearest mesh vertex under the cursor
+    void    mark_seam_path(int v_from, int v_to);            // seam every edge on the shortest path
+    void    rebuild_seam_anchor_overlay();
+    // Set while an island gesture is in flight, so the undo snapshot is taken once at the start of
+    // the drag (capturing the state *before* it) rather than on every motion event.
+    bool m_island_drag_active = false;
+
+    // Which of the up to TEXTURE_DISPLACEMENT_MAX_LAYERS paint masks the brush currently writes
+    // into. Always a valid slot index (0 by default) so the base class's per-volume selector
+    // machinery always has something to work with, even before any texture has been added -
+    // painting into a slot with no texture assigned is harmless, it just has no visible/bake
+    // effect until a texture is added to that slot.
+    int  m_active_layer_slot = 0;
+    bool m_bake_in_progress  = false;
+
+    // When set, the true-displacement geometry is rebuilt on every parameter change (live), instead of
+    // only once the slider being dragged is released. On by default so painting/added textures show
+    // straight away without needing to nudge a slider first.
+    bool m_auto_update = true;
+
+    // Subdivision is now count-based (split the whole mesh 1..5 times) rather than a target edge
+    // length, and is previewed as a wireframe before it is committed: nothing is written to the model
+    // until "Apply". While previewing, the would-be subdivided mesh is drawn as a wireframe overlay so
+    // the added density is visible; "Done" ends the preview without touching the model. The normal
+    // "Show mesh wireframe" toggle is left alone, so a wireframe the user already had on stays on.
+    // 0 is a real value meaning "no subdivision": it previews nothing and Apply is a no-op. Apply
+    // snaps the slider back to it, because each pass quadruples the triangle count - leaving the
+    // count where it was would immediately re-preview N more passes on top of the mesh that was just
+    // committed, i.e. the most expensive thing the panel can do, on every Apply.
+    int     m_subdivide_count         = 1;
+    bool    m_subdivide_editing       = false;
+    int     m_subdivide_preview_count = -1; // the count m_subdivide_preview_glmodel was built for
+    GLModel m_subdivide_preview_glmodel;
+    void    rebuild_subdivide_preview();
+    void    render_subdivide_preview();
+
+    // Isotropic remeshing (CGAL) to even out wildly varying triangle sizes so displacement has a
+    // consistent density to work with. Target edge length in mm; 0 means "not yet initialised", filled
+    // with the mesh's mean edge length the first time the control is shown. Like subdivide, it replaces
+    // the geometry and drops not-yet-baked paint (no remap across a topology change).
+    float m_remesh_target_edge_mm = 0.f;
+    // Dihedral angle above which an edge counts as a hard feature and is held fixed by the remesher.
+    // Off by default would round every sharp edge off, so this is on; 0 disables the protection.
+    float m_remesh_sharp_angle_deg   = 40.f;
+    bool  m_remesh_keep_sharp_edges  = true;
+    void  remesh_model();
+
+    // Live, pre-bake preview of the true displaced geometry (built by the same algorithm Bake
+    // uses). Empty/uninitialized whenever nothing is painted yet, in which case the gizmo falls
+    // back to the standard paint-mask overlay like every other painting gizmo.
+    GLModel m_preview_glmodel;
+    // Set while a layer parameter slider has changed since the last rebuild_preview() call but the
+    // mouse button driving the drag hasn't been released yet - see on_render_input_window().
+    bool m_preview_params_dirty = false;
+
+    // See rebuild_bump_preview_mesh()/render_bump_preview_mesh().
+    bool    m_use_bump_preview = false;
+    // Set from the UV editor's per-move island edits instead of rebuilding the (potentially large) bump
+    // mesh synchronously inside that mouse handler - doing the rebuild there stalled both the UV pane
+    // and the 3D view. The rebuild is instead coalesced to once per 3D frame (render_painter_gizmo).
+    bool    m_bump_preview_dirty = false;
+    GLModel m_bump_preview_glmodel;
+    // Whether the current bump mesh carries a precomputed per-vertex uv (LSCM) that the shader
+    // should sample at directly, rather than projecting in-shader. Set by rebuild_bump_preview_mesh().
+    bool    m_bump_preview_uses_vertex_uv = false;
+
+    // GPU island drag: while an island is dragged in the UV editor, the bump mesh is baked once (with
+    // the dragged island's vertices flagged, v_normal.y = 1) and then moved purely through the shader's
+    // island_delta uniform - one uniform update per mouse move, no rebuild - so it tracks the cursor
+    // as smoothly as Adjust placement. m_bump_active_chart is the dragged island (or -1);
+    // m_bump_active_vertex flags its base vertices; m_bump_baked_active_xf is that island's placement
+    // baked into the current mesh, against which the live delta is measured; m_bump_island_delta is the
+    // resulting final-uv-space affine handed to the shader (identity except mid-drag).
+    int                        m_bump_active_chart = -1;
+    std::vector<uint8_t>       m_bump_active_vertex;
+    Eigen::Matrix<float, 2, 3> m_bump_baked_active_xf = Eigen::Matrix<float, 2, 3>::Identity();
+    Eigen::Matrix<float, 2, 3> m_bump_island_delta    = Eigen::Matrix<float, 2, 3>::Identity();
+    void                       compute_bump_active_vertices(const std::vector<int> &charts);
+
+    // The set of islands the current UV-editor drag moves together: the pane's multi-selection unioned
+    // with each selected island's join group (see build_island_move_set()). Populated at drag start and
+    // cleared when it finishes. A move applies the same offset to every island in it; rotate/scale act
+    // only on the primary. Empty when no move drag is in flight.
+    std::vector<int> m_island_move_set;
+    // All islands that must move with `primary`: the pane's multi-selection plus, for each of those, the
+    // charts sharing its join group in `layer`. Always contains `primary`.
+    std::vector<int> build_island_move_set(const TextureDisplacementLayer &layer, int primary) const;
+    // The join-group id of chart `c`: its explicit entry in `groups`, or `c` itself (its own singleton)
+    // when unset. Two charts move together iff this matches.
+    static int       island_group_of(const std::vector<int> &groups, int c);
+    // Merges chart `b`'s join group into chart `a`'s (materialising `groups` to `chart_count` first).
+    static void      join_island_groups(std::vector<int> &groups, int a, int b, int chart_count);
+    // Final per-vertex texture uv for the projections the shader can't reconstruct itself - LSCM (an
+    // unwrap) and ViewProjected (a projector plane the shader doesn't know). One entry per patch/base
+    // vertex, already through apply_uv_transform(). Empty for Triplanar/Cylindrical/Spherical, which
+    // the shader projects on its own. Shared by the bump preview and the UV-check overlay.
+    std::vector<Vec2f> compute_layer_vertex_uvs(const indexed_triangle_set &patch,
+                                                const TextureDisplacementLayer &layer) const;
+
+    // UV-check overlay drawn over the painted patch to sanity-check the unwrap (#13/#14). Built by
+    // rebuild_uvcheck_mesh(), drawn by render_uvcheck_mesh() with the "texture_displacement_uvcheck"
+    // shader. Checker works for any projection; Distortion needs the per-vertex LSCM uv.
+    enum class UVCheckMode { None, Checker, Distortion };
+    UVCheckMode m_uv_check_mode = UVCheckMode::None;
+    GLModel     m_uvcheck_glmodel;
+    bool        m_uvcheck_uses_vertex_uv = false;
+    void rebuild_uvcheck_mesh();
+    void render_uvcheck_mesh();
+
+    // The UV editor pane is opened only on the user's explicit request (this toggle in the panel),
+    // never automatically just because a patch exists - auto-popping it whenever there was "a
+    // selection to process" is exactly what the user asked to stop. update_uv_editor() keeps the pane
+    // hidden unless this is set. Reset on gizmo shutdown so reopening the gizmo doesn't reopen the pane.
+    bool m_show_uv_editor = false;
+    // The unwrap is expensive, so it is recomputed only when the user explicitly asks for it (the
+    // "Unwrap" button), not on every paint stroke or slider nudge. This is set by that button and
+    // consumed by the next update_uv_editor() call, which is the only path that re-solves the unwrap;
+    // every other call merely refreshes the cheap per-island affine transforms over the existing one.
+    bool m_uv_unwrap_pending = false;
+    // Set alongside m_uv_unwrap_pending only by the Unwrap button, so the connected-net auto-layout runs
+    // on a genuine re-unwrap but not on a refresh re-solve (a vertex-edit commit or undo), which must
+    // leave island placements untouched.
+    bool m_uv_apply_connected_net = false;
+    // Signature of the per-vertex UV overrides last reflected in the pane. When it changes without the
+    // user pressing Unwrap - a vertex/edge edit committing, or an undo/redo reverting one - the pane
+    // is re-solved so its geometry follows, even though a plain edit otherwise never re-solves (#Feat2).
+    size_t m_uv_overrides_sig = 0;
+    // What the UV pane's background currently holds, so update_uv_editor() only re-uploads it when the
+    // choice actually changes (the height texture is large; re-sending it every stroke would be waste).
+    enum class UVBackground { None, Height, Checker };
+    UVBackground m_uv_editor_bg = UVBackground::None;
+    float        m_uv_editor_bg_smoothing = -1.f; // smoothing the height backdrop was uploaded at
+    // Per-chart distortion heatmap colour for the UV pane (#7/#14), computed once when the unwrap is
+    // re-solved (relative stretch doesn't change when islands are merely moved), fed to the canvas only
+    // while the Distortion check mode is on. Empty otherwise.
+    std::vector<ColorRGBA> m_uv_editor_distortion_colors;
+    void                   compute_uv_editor_distortion_colors(const indexed_triangle_set &patch);
+
+    // Plain triangle-edge overlay on the mesh (#8), toggled independently of the check modes.
+    bool    m_wireframe_overlay = false;
+    GLModel m_wireframe_overlay_glmodel;
+    size_t  m_wireframe_overlay_vcount = 0; // topology signature, so it rebuilds only on a real change
+    void rebuild_wireframe_overlay();       // from the base mesh (bump/paint mode)
+    void build_wireframe_from_its(const indexed_triangle_set &its); // from an explicit mesh, no early-out
+    void refresh_wireframe();               // pick base vs displaced source for the current view
+    void render_wireframe_overlay();
+    // The displaced preview geometry the last preview job produced, kept so the wireframe overlay can be
+    // drawn on the raised surface actually shown in the true-displacement view (#: "wireframe in real mode").
+    indexed_triangle_set m_preview_its;
+    // Bumped on every rebuild_preview() call; a background TextureDisplacementPreviewJob's result
+    // is only applied if this hasn't moved on since the job was queued (see rebuild_preview()),
+    // so a burst of edits can't have an earlier, now-stale job clobber a later one's result.
+    uint64_t m_preview_generation = 0;
+
+    // Per-slot GPU thumbnail cache for the layer list panel, keyed by the image_data pointer that
+    // was current the last time each thumbnail was built (see get_layer_thumbnail()).
+    std::array<std::unique_ptr<GLTexture>, TEXTURE_DISPLACEMENT_MAX_LAYERS> m_thumbnails;
+    std::array<const void *, TEXTURE_DISPLACEMENT_MAX_LAYERS>               m_thumbnail_source{};
+    // The smoothing each cached thumbnail was built at, so a smoothing change re-uploads it (and the
+    // fast/bump preview, which samples this texture, actually shows the blur).
+    std::array<float, TEXTURE_DISPLACEMENT_MAX_LAYERS>                      m_thumbnail_smoothing{};
+
+    // Library textures the picker has shown at least once, keyed by file path (see LibraryTexture).
+    std::map<std::string, LibraryTexture> m_library_textures;
+
+    // Everything the *unwrap* depends on. update_uv_editor() runs from rebuild_preview(), i.e. on
+    // every stroke end and every slider release - but depth/tiling/rotation/offset/blend change
+    // none of this, so re-extracting the patch and re-solving on those edits would be pure waste.
+    // Held as the real values rather than a hash: TriangleSplittingData has an exact operator==, so
+    // there is no reason to accept a hash's (however unlikely) chance of showing a stale unwrap.
+    struct UVEditorState
+    {
+        int                                     slot       = -1;
+        const void                             *image_data = nullptr;
+        float                                   seam_angle = -1.f;
+        float                                   padding    = -2.f;
+        TriangleSelector::TriangleSplittingData facets;
+        // Manual/auto seam edges also change the unwrap, so a change here must force a re-solve just
+        // like the facets do (marking a seam leaves the paint mask untouched).
+        std::vector<std::pair<int, int>>        seam_edges;
+
+        bool operator==(const UVEditorState &other) const
+        {
+            return slot == other.slot && image_data == other.image_data && seam_angle == other.seam_angle &&
+                   padding == other.padding && facets == other.facets && seam_edges == other.seam_edges;
+        }
+    };
+    UVEditorState m_uv_editor_state;
+    // Bounds of the UVs last handed to the pane, purely so the panel can show where the unwrap
+    // actually landed - it is packed in mm and then divided by the tile size, so it is easy for it
+    // to end up far outside the texture's first tile without any of that being visible.
+    Vec2f m_uv_editor_bbox_min = Vec2f::Zero();
+    Vec2f m_uv_editor_bbox_max = Vec2f::Zero();
+    // The unwrap m_uv_editor_state produced, kept so that changing tiling/rotation/offset only costs
+    // re-running apply_uv_transform() over it, not another extraction and solve.
+    PatchUnwrap m_uv_editor_unwrap;
+
+    // When set, the panel is a free-floating window the user can drag anywhere (with a title bar to
+    // grab), instead of being pinned to the right of the gizmo toolbar. Persisted across gizmo
+    // open/close within a session, so the choice sticks while working.
+    bool m_undocked = false;
+
+    // See the "Adjust Texture" block of private methods above.
+    bool  m_adjust_texture_mode      = false;
+    bool  m_adjust_anchor_valid      = false;
+    Vec3f m_adjust_anchor_pos        = Vec3f::Zero();  // mesh-local
+    Vec3f m_adjust_anchor_normal     = Vec3f::UnitZ(); // mesh-local
+
+    // Pan: free drag anywhere on the flat panel, moves offset along both axes. AxisU/AxisV: drag
+    // the corresponding arrow, moves offset along only that one axis.
+    enum class AdjustHandle { None, Pan, AxisU, AxisV };
+    AdjustHandle m_adjust_drag_handle       = AdjustHandle::None;
+    Vec2f        m_adjust_drag_start_offset = Vec2f::Zero();
+    // Anchor-relative planar position (see project_planar()) of the point under the mouse at the
+    // moment the current drag started; every subsequent frame's delta is measured against this,
+    // rather than accumulated frame-to-frame, to avoid drift.
+    Vec2f m_adjust_drag_start_planar = Vec2f::Zero();
+
+    // Lazily-built unit quad (the pan panel) and unit line-with-arrowhead (reused, rotated, for
+    // both the U and V axis arrows), transformed into place at render time.
+    GLModel m_adjust_panel_glmodel;
+    GLModel m_adjust_arrow_glmodel;
+
+    std::map<std::string, wxString> m_desc;
+
+    // The tool's SVG (toolbar_texture_displacement.svg) uploaded once as a GL texture, so it can be
+    // used as an ImGui image button in the panel (currently the "add layer" affordance next to the
+    // Texture layers heading). Lazily loaded on first use, when a GL context is guaranteed current.
+    GLTexture    m_tool_icon;
+    bool         m_tool_icon_tried = false;
+    unsigned int tool_icon_id(); // 0 if the icon could not be loaded
+
+    // Icons for the panel's selection-mode and view-mode button rows. Loaded through IconManager with
+    // the same colour/monochrome variants the main toolbar uses, so an inactive button shows the icon in
+    // the theme's normal (grey) foreground colour and an active one shows it in its original colours -
+    // matching the toolbar's selected/unselected look. Uploaded once on first panel render.
+    IconManager                                m_panel_icons;
+    std::map<std::string, IconManager::Icons>  m_panel_icon_map; // file name -> [normal, colour, disabled]
+    bool                                       m_panel_icons_tried = false;
+    void                                       ensure_panel_icons();
+};
+
+} // namespace Slic3r::GUI
+
+#endif // slic3r_GLGizmoTextureDisplacement_hpp_

src/slic3r/GUI/Gizmos/GLGizmosManager.cpp

@@ -22,6 +22,7 @@
 //#include "slic3r/GUI/Gizmos/GLGizmoHollow.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoSeam.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.hpp"
+#include "slic3r/GUI/Gizmos/GLGizmoTextureDisplacement.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoSimplify.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoEmboss.hpp"
 #include "slic3r/GUI/Gizmos/GLGizmoSVG.hpp"
@@ -164,6 +165,9 @@ void GLGizmosManager::switch_gizmos_icon_filename()
         case(EType::FuzzySkin):
             gizmo->set_icon_filename(m_is_dark ? "toolbar_fuzzy_skin_paint_dark.svg" : "toolbar_fuzzy_skin_paint.svg");
             break;
+        case(EType::TextureDisplacement):
+            gizmo->set_icon_filename(m_is_dark ? "toolbar_fuzzy_skin_paint_dark.svg" : "toolbar_fuzzy_skin_paint.svg");
+            break;
         case(EType::MeshBoolean):
             gizmo->set_icon_filename(m_is_dark ? "toolbar_meshboolean_dark.svg" : "toolbar_meshboolean.svg");
             break;
@@ -213,6 +217,8 @@ bool GLGizmosManager::init()
     m_gizmos.emplace_back(new GLGizmoSeam(m_parent, m_is_dark ? "toolbar_seam_dark.svg" : "toolbar_seam.svg", EType::Seam));
     m_gizmos.emplace_back(new GLGizmoFuzzySkin(m_parent, m_is_dark ? "toolbar_fuzzy_skin_paint_dark.svg" : "toolbar_fuzzy_skin_paint.svg", EType::FuzzySkin));
     m_gizmos.emplace_back(new GLGizmoMmuSegmentation(m_parent, m_is_dark ? "mmu_segmentation_dark.svg" : "mmu_segmentation.svg", EType::MmSegmentation));
+    // One shared icon (no dedicated dark variant yet); it recolours acceptably in both themes.
+    m_gizmos.emplace_back(new GLGizmoTextureDisplacement(m_parent, "toolbar_texture_displacement.svg", EType::TextureDisplacement));
     m_gizmos.emplace_back(new GLGizmoEmboss(m_parent, m_is_dark ? "toolbar_text_dark.svg" : "toolbar_text.svg", EType::Emboss));
     m_gizmos.emplace_back(new GLGizmoSVG(m_parent));
     m_gizmos.emplace_back(new GLGizmoMeasure(m_parent, m_is_dark ? "toolbar_measure_dark.svg" : "toolbar_measure.svg", EType::Measure));
@@ -524,6 +530,8 @@ bool GLGizmosManager::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_p
         return dynamic_cast<GLGizmoCut3D*>(m_gizmos[Cut].get())->gizmo_event(action, mouse_position, shift_down, alt_down, control_down);
     else if (m_current == FuzzySkin)
         return dynamic_cast<GLGizmoFuzzySkin*>(m_gizmos[FuzzySkin].get())->gizmo_event(action, mouse_position, shift_down, alt_down, control_down);
+    else if (m_current == TextureDisplacement)
+        return dynamic_cast<GLGizmoTextureDisplacement*>(m_gizmos[TextureDisplacement].get())->gizmo_event(action, mouse_position, shift_down, alt_down, control_down);
     else if (m_current == MeshBoolean)
         return dynamic_cast<GLGizmoMeshBoolean*>(m_gizmos[MeshBoolean].get())->gizmo_event(action, mouse_position, shift_down, alt_down, control_down);
     else if (m_current == BrimEars)
@@ -537,6 +545,7 @@ bool GLGizmosManager::is_paint_gizmo()
     return m_current == EType::FdmSupports ||
            m_current == EType::MmSegmentation ||
            m_current == EType::FuzzySkin ||
+           m_current == EType::TextureDisplacement ||
            m_current == EType::Seam;
 }
 
@@ -1486,6 +1495,8 @@ std::string get_name_from_gizmo_etype(GLGizmosManager::EType type)
         return "Color Painting";
     case GLGizmosManager::EType::FuzzySkin:
         return "Fuzzy Skin Painting";
+    case GLGizmosManager::EType::TextureDisplacement:
+        return "Texture Displacement";
     default:
         return "";
     }

src/slic3r/GUI/Gizmos/GLGizmosManager.hpp

@@ -84,6 +84,7 @@ public:
         Seam,
         FuzzySkin,
         MmSegmentation,
+        TextureDisplacement,
         Emboss,
         Svg,
         Measure,

src/slic3r/GUI/ImGuiWrapper.cpp

@@ -2554,7 +2554,11 @@ void ImGuiWrapper::push_toolbar_style(const float scale)
         ImGui::PushStyleColor(ImGuiCol_FrameBgActive, ImVec4(238 / 255.0f, 238 / 255.0f, 238 / 255.0f, 1.00f));  // 10
         ImGui::PushStyleColor(ImGuiCol_FrameBg, ImVec4(238 / 255.0f, 238 / 255.0f, 238 / 255.0f, 0.00f));        // 11
         ImGui::PushStyleColor(ImGuiCol_TextSelectedBg, COL_GREEN_LIGHT);                                     // 12
-        ImGui::PushStyleColor(ImGuiCol_CheckMark, ImVec4(1.00f, 1.00f, 1.00f, 1.00f));//13
+        // The checkbox/radio frame behind this is drawn fully transparent (see FrameBg above,
+        // alpha 0), showing the light window background through it - a white check mark there is
+        // invisible. Dark mode doesn't have this problem (its window background is dark), so only
+        // this branch needs a check mark color with real contrast against a light background.
+        ImGui::PushStyleColor(ImGuiCol_CheckMark, ImVec4(0.f, 156 / 255.f, 136 / 255.f, 1.00f));//13
         ImGui::PushStyleColor(ImGuiCol_ScrollbarGrab, ImVec4(0.42f, 0.42f, 0.42f, 1.00f));
         ImGui::PushStyleColor(ImGuiCol_ScrollbarGrabHovered, ImVec4(0.93f, 0.93f, 0.93f, 1.00f));
         ImGui::PushStyleColor(ImGuiCol_ScrollbarGrabActive, ImVec4(0.93f, 0.93f, 0.93f, 1.00f));

src/slic3r/GUI/Jobs/TextureDisplacementBakeJob.cpp

@@ -0,0 +1,88 @@
+#include "TextureDisplacementBakeJob.hpp"
+
+#include <algorithm>
+
+#include "libslic3r/Model.hpp"
+
+#include "slic3r/GUI/GLCanvas3D.hpp"
+#include "slic3r/GUI/GUI_App.hpp"
+#include "slic3r/GUI/GUI_ObjectList.hpp"
+#include "slic3r/GUI/I18N.hpp"
+#include "slic3r/GUI/Plater.hpp"
+#include "slic3r/Utils/UndoRedo.hpp"
+
+namespace Slic3r::GUI {
+
+TextureDisplacementBakeJob::TextureDisplacementBakeJob(TextureDisplacementBakeInput &&input, std::function<void()> on_finished)
+    : m_input(std::move(input)), m_on_finished(std::move(on_finished))
+{
+}
+
+void TextureDisplacementBakeJob::process(Ctl &ctl)
+{
+    ctl.update_status(0, _u8L("Baking texture displacement"));
+
+    // Only ever touches m_input (captured by value before this job was queued) and local state -
+    // never the live Model - so this is safe to run concurrently with the UI thread.
+    m_result = TriangleMesh(build_texture_displacement(m_input.base_mesh, m_input.layers, m_input.facets_data));
+}
+
+void TextureDisplacementBakeJob::finalize(bool canceled, std::exception_ptr &eptr)
+{
+    struct OnExit
+    {
+        std::function<void()> fn;
+        ~OnExit() { if (fn) fn(); }
+    } on_exit{m_on_finished};
+
+    if (canceled || eptr || m_result.empty())
+        return;
+
+    Plater *plater = wxGetApp().plater();
+
+    Plater::TakeSnapshot snapshot(plater, _u8L("Bake texture displacement"), UndoRedo::SnapshotType::GizmoAction);
+
+    ModelVolume *volume = get_model_volume(m_input.volume_id, plater->model().objects);
+    if (volume == nullptr)
+        return;
+
+    volume->set_mesh(std::move(m_result));
+    volume->set_new_unique_id();
+    volume->calculate_convex_hull();
+
+    // Clear the paint mask of every layer that was actually baked so a repeat bake (or the paint
+    // overlay) doesn't act on triangles that no longer represent the same unbaked surface. The
+    // texture layer definitions themselves (and paint outside the baked area, if any) are left
+    // untouched so the user can keep sculpting with the same textures.
+    for (const TextureDisplacementLayer &layer : m_input.layers)
+        if (!layer.empty() && layer.slot >= 0 && layer.slot < int(TEXTURE_DISPLACEMENT_MAX_LAYERS))
+            volume->texture_displacement_facet(layer.slot).reset();
+
+    ModelObject *object = volume->get_object();
+    if (object == nullptr)
+        return;
+
+    if (ObjectList *obj_list = wxGetApp().obj_list()) {
+        const ModelObjectPtrs &objs = plater->model().objects;
+        auto it = std::find(objs.begin(), objs.end(), object);
+        if (it != objs.end())
+            obj_list->update_info_items(size_t(it - objs.begin()));
+    }
+
+    plater->changed_object(*object);
+}
+
+void queue_texture_displacement_bake(const ModelVolume &volume, std::function<void()> on_finished)
+{
+    TextureDisplacementBakeInput input;
+    input.volume_id  = volume.id();
+    input.base_mesh  = volume.mesh().its;
+    input.layers     = volume.texture_displacement_layers;
+    for (int i = 0; i < int(TEXTURE_DISPLACEMENT_MAX_LAYERS); ++i)
+        input.facets_data[size_t(i)] = volume.texture_displacement_facet(i).get_data();
+
+    auto &worker = wxGetApp().plater()->get_ui_job_worker();
+    queue_job(worker, std::make_unique<TextureDisplacementBakeJob>(std::move(input), std::move(on_finished)));
+}
+
+} // namespace Slic3r::GUI

src/slic3r/GUI/Jobs/TextureDisplacementBakeJob.hpp

@@ -0,0 +1,51 @@
+#ifndef slic3r_TextureDisplacementBakeJob_hpp_
+#define slic3r_TextureDisplacementBakeJob_hpp_
+
+#include <functional>
+#include <vector>
+
+#include "libslic3r/ObjectID.hpp"
+#include "libslic3r/TextureDisplacement.hpp"
+#include "libslic3r/TriangleMesh.hpp"
+
+#include "Job.hpp"
+
+namespace Slic3r::GUI {
+
+// Everything process() needs, captured by value on the main thread when the job is queued so the
+// worker thread never touches the live Model concurrently with the UI (mirrors how EmbossJob's
+// DataBase is captured before process() runs).
+struct TextureDisplacementBakeInput
+{
+    ObjectID                              volume_id;
+    indexed_triangle_set                  base_mesh;
+    std::vector<TextureDisplacementLayer> layers;
+    TextureDisplacementFacetsData         facets_data;
+};
+
+// Bakes a volume's painted texture-displacement layers into real mesh geometry in the background,
+// then commits the result on the main thread - mirrors EmbossJob's UpdateJob/update_volume()
+// bake-and-commit pattern (see EmbossJob.cpp).
+class TextureDisplacementBakeJob : public Job
+{
+public:
+    TextureDisplacementBakeJob(TextureDisplacementBakeInput &&input, std::function<void()> on_finished);
+
+    void process(Ctl &ctl) override;
+    void finalize(bool canceled, std::exception_ptr &eptr) override;
+
+private:
+    TextureDisplacementBakeInput m_input;
+    TriangleMesh                 m_result;
+    std::function<void()>        m_on_finished;
+};
+
+// Captures `volume`'s current mesh/layers/paint data and queues a TextureDisplacementBakeJob on
+// the app's UI job worker. `on_finished` is always called once the job settles (success, failure,
+// or cancellation), so the caller can clear its own "bake in progress" UI state. Must be called
+// from the main thread.
+void queue_texture_displacement_bake(const ModelVolume &volume, std::function<void()> on_finished);
+
+} // namespace Slic3r::GUI
+
+#endif // slic3r_TextureDisplacementBakeJob_hpp_

src/slic3r/GUI/Jobs/TextureDisplacementPreviewJob.cpp

@@ -0,0 +1,29 @@
+#include "TextureDisplacementPreviewJob.hpp"
+
+#include "slic3r/GUI/I18N.hpp"
+
+namespace Slic3r::GUI {
+
+TextureDisplacementPreviewJob::TextureDisplacementPreviewJob(TextureDisplacementPreviewInput &&input, uint64_t generation,
+                                                              std::function<void(indexed_triangle_set, uint64_t)> on_finished)
+    : m_input(std::move(input)), m_generation(generation), m_on_finished(std::move(on_finished))
+{
+}
+
+void TextureDisplacementPreviewJob::process(Ctl &ctl)
+{
+    ctl.update_status(0, _u8L("Computing texture displacement preview"));
+
+    // Only ever touches m_input (captured by value before this job was queued) and local state -
+    // never the live Model - so this is safe to run concurrently with the UI thread.
+    m_result = build_texture_displacement(m_input.base_mesh, m_input.layers, m_input.facets_data);
+}
+
+void TextureDisplacementPreviewJob::finalize(bool canceled, std::exception_ptr &eptr)
+{
+    if (canceled || eptr || !m_on_finished)
+        return;
+    m_on_finished(std::move(m_result), m_generation);
+}
+
+} // namespace Slic3r::GUI

src/slic3r/GUI/Jobs/TextureDisplacementPreviewJob.hpp

@@ -0,0 +1,52 @@
+#ifndef slic3r_TextureDisplacementPreviewJob_hpp_
+#define slic3r_TextureDisplacementPreviewJob_hpp_
+
+#include <cstdint>
+#include <functional>
+#include <vector>
+
+#include "libslic3r/TextureDisplacement.hpp"
+#include "libslic3r/TriangleMesh.hpp"
+
+#include "Job.hpp"
+
+namespace Slic3r::GUI {
+
+// Everything process() needs, captured by value on the main thread when the job is queued -
+// mirrors TextureDisplacementBakeInput, but a preview never writes back to the Model.
+struct TextureDisplacementPreviewInput
+{
+    indexed_triangle_set                  base_mesh;
+    std::vector<TextureDisplacementLayer> layers;
+    TextureDisplacementFacetsData         facets_data;
+};
+
+// Computes the true (unbaked) displaced-mesh preview in the background. With several painted
+// layers this is real, non-trivial CPU work (PNG sampling, per-layer vertex welding), which used
+// to run synchronously on every paint stroke and parameter tweak and made editing feel slow with
+// more than one or two layers. Unlike Bake, this never touches the live Model - a preview is
+// purely informational, there is nothing to commit.
+class TextureDisplacementPreviewJob : public Job
+{
+public:
+    // `generation` is an opaque token the caller controls (typically an incrementing counter):
+    // on_finished should only actually be applied by the caller if it still matches the caller's
+    // current generation when the job completes, so that a burst of edits queuing several of
+    // these jobs in a row can't have an earlier, now-stale result clobber a later one that
+    // finishes first.
+    TextureDisplacementPreviewJob(TextureDisplacementPreviewInput &&input, uint64_t generation,
+                                   std::function<void(indexed_triangle_set, uint64_t)> on_finished);
+
+    void process(Ctl &ctl) override;
+    void finalize(bool canceled, std::exception_ptr &eptr) override;
+
+private:
+    TextureDisplacementPreviewInput                    m_input;
+    uint64_t                                            m_generation;
+    indexed_triangle_set                                m_result;
+    std::function<void(indexed_triangle_set, uint64_t)> m_on_finished;
+};
+
+} // namespace Slic3r::GUI
+
+#endif // slic3r_TextureDisplacementPreviewJob_hpp_

src/slic3r/GUI/Plater.cpp

@@ -103,6 +103,7 @@
 #include "Selection.hpp"
 #include "GLToolbar.hpp"
 #include "GUI_Preview.hpp"
+#include "UVEditorCanvas.hpp"
 #include "3DBed.hpp"
 #include "PartPlate.hpp"
 #include "Camera.hpp"
@@ -5283,6 +5284,13 @@ struct Plater::priv
     GLToolbar collapse_toolbar;
     Preview *preview;
     AssembleView* assemble_view { nullptr };
+    // Docked/resizable 2D pane showing GLGizmoTextureDisplacement's LSCM unwrap of a painted
+    // patch; a sibling AUI pane alongside "sidebar"/"main", not part of the view3D/preview/
+    // assemble_view sizer - see its registration below and Plater::get_uv_editor_canvas(). The
+    // pane hosts the panel (toolbar + canvas + status line); uv_editor_canvas is its inner canvas,
+    // cached so the gizmo can reach it directly.
+    UVEditorPanel*  uv_editor_panel { nullptr };
+    UVEditorCanvas* uv_editor_canvas { nullptr };
     bool first_enter_assemble{ true };
     std::unique_ptr<NotificationManager> notification_manager;
 
@@ -5948,6 +5956,20 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
                                    .BottomDockable(false)
                                    .BestSize(wxSize(39 * wxGetApp().em_unit(), 90 * wxGetApp().em_unit())));
 
+    // UV editor pane for GLGizmoTextureDisplacement's LSCM unwrap preview - a resizable/dockable
+    // sibling of "sidebar"/"main" like everything else registered on this same AUI manager, not a
+    // change to the view3D/preview/assemble_view sizer above. Hidden by default: only relevant
+    // while that gizmo is active with a layer using the "Unwrap (LSCM)" projection method (see
+    // Plater::show_uv_editor()), so it stays out of the way of everyone else's window layout.
+    uv_editor_panel  = new UVEditorPanel(q);
+    uv_editor_canvas = uv_editor_panel->canvas();
+    m_aui_mgr.AddPane(uv_editor_panel, wxAuiPaneInfo()
+                                            .Name("uv_editor")
+                                            .Caption(_L("UV Editor"))
+                                            .Right()
+                                            .Hide()
+                                            .BestSize(wxSize(40 * wxGetApp().em_unit(), 40 * wxGetApp().em_unit())));
+
     auto* panel_sizer = new wxBoxSizer(wxHORIZONTAL);
     panel_sizer->Add(view3D, 1, wxEXPAND | wxALL, 0);
     panel_sizer->Add(preview, 1, wxEXPAND | wxALL, 0);
@@ -5977,6 +5999,13 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
                 BOOST_LOG_TRIVIAL(info) << "Removed floating AUI state from saved window layout for Wayland";
             }
 
+            // The UV editor is a transient, gizmo-driven pane (see show_uv_editor()); a saved layout
+            // from a session that happened to close with it open would otherwise restore it visible on
+            // startup, with nothing painted in it. Force it hidden here so it only ever appears when the
+            // texture-displacement gizmo asks for it.
+            if (wxAuiPaneInfo &uv_pane = m_aui_mgr.GetPane("uv_editor"); uv_pane.IsOk())
+                uv_pane.Hide();
+
             sidebar_layout.is_collapsed = !sidebar.IsShown();
         }
 
@@ -13936,7 +13965,7 @@ void adjust_settings_for_flowrate_calib(ModelObjectPtrs& objects, bool linear, i
     auto printer_config  = &wxGetApp().preset_bundle->printers.get_edited_preset().config;
     auto filament_config = &wxGetApp().preset_bundle->filaments.get_edited_preset().config;
 
-    /// --- scale ---
+    /// -- scale --
     // model is created for a 0.4 nozzle, scale z with nozzle size.
     const ConfigOptionFloats* nozzle_diameter_config = printer_config->option<ConfigOptionFloats>("nozzle_diameter");
     std::vector<int> extruder_types         = printer_config->option<ConfigOptionEnumsGeneric>("extruder_type")->values;
@@ -18060,6 +18089,33 @@ GLCanvas3D* Plater::get_assmeble_canvas3D()
     return nullptr;
 }
 
+UVEditorCanvas* Plater::get_uv_editor_canvas()
+{
+    return p->uv_editor_canvas;
+}
+
+void Plater::show_uv_editor(bool show)
+{
+    if (p->uv_editor_panel == nullptr)
+        return;
+    const wxAuiPaneInfo &pane = p->m_aui_mgr.GetPane(p->uv_editor_panel);
+    if (!pane.IsOk() || pane.IsShown() == show)
+        return;
+
+    // Deferred, because GLGizmoTextureDisplacement calls this from its ImGui panel - that is, from
+    // the middle of the 3D canvas's GL frame. Showing an AUI pane re-lays out the window and
+    // delivers the resulting size/paint events synchronously, and the UV canvas painting itself
+    // makes its own surface current in the app's *shared* GL context, which mid-frame is the one
+    // the 3D canvas is drawing into. Doing the layout once the frame is over avoids that entirely.
+    CallAfter([this, show]() {
+        wxAuiPaneInfo &deferred_pane = p->m_aui_mgr.GetPane(p->uv_editor_panel);
+        if (!deferred_pane.IsOk() || deferred_pane.IsShown() == show)
+            return;
+        deferred_pane.Show(show);
+        p->m_aui_mgr.Update();
+    });
+}
+
 GLCanvas3D* Plater::get_current_canvas3D(bool exclude_preview)
 {
     return p->get_current_canvas3D(exclude_preview);

src/slic3r/GUI/Plater.hpp

@@ -624,6 +624,13 @@ public:
     GLCanvas3D* get_assmeble_canvas3D();
     wxWindow* get_select_machine_dialog();
 
+    // Docked UV-editor pane used by GLGizmoTextureDisplacement's LSCM projection preview (see
+    // UVEditorCanvas.hpp). Returns nullptr only before the main window is fully constructed.
+    class UVEditorCanvas* get_uv_editor_canvas();
+    // Shows or hides the UV-editor AUI pane, updating its docked layout accordingly. Safe to call
+    // repeatedly (e.g. every time the gizmo's active layer/projection method changes).
+    void show_uv_editor(bool show);
+
     void arrange();
     void orient();
     void find_new_position(const ModelInstancePtrs  &instances);

src/slic3r/GUI/Tab.cpp

@@ -34,6 +34,7 @@
 #include "GUI_App.hpp"
 #include "GUI_ObjectList.hpp"
 #include "slic3r/Utils/PresetUpdater.hpp"
+#include "slic3r/plugin/PluginConfig.hpp"
 #include "Plater.hpp"
 #include "MainFrame.hpp"
 #include "format.hpp"
@@ -1795,9 +1796,19 @@ void Tab::on_value_change(const std::string& opt_key, const boost::any& value)
 
     // Keep this preset's "plugins" manifest in sync when a plugin picker changes, so full_config() and
     // save_to_json() always find resolved "name;uuid;capability" references and rebuild it nowhere else.
+    // Also drop any plugin_config_overrides entries for a capability the change just stopped
+    // referencing (e.g. a plugin removed from slicing_pipeline_plugin), so a saved preset never
+    // carries configuration for a capability it no longer names. The Configure button is a separate
+    // field holding its own cached copy of that value, so it needs to be told explicitly, or it
+    // keeps showing the stale count until something else happens to refresh it.
     if (const ConfigOptionDef* opt_def = m_config->def()->get(opt_key);
-        opt_def && opt_def->is_plugin_backed())
+        opt_def && opt_def->is_plugin_backed()) {
         m_config->update_plugin_manifest();
+        if (prune_stale_plugin_overrides(*m_config)) {
+            if (Field* overrides_field = get_field(PLUGIN_OVERRIDES_OPTION_KEY))
+                overrides_field->set_value(boost::any(m_config->opt_string(PLUGIN_OVERRIDES_OPTION_KEY)), false);
+        }
+    }
 
     if (opt_key == "gcode_flavor" && m_type == Preset::TYPE_PRINTER) {
         if (auto printer_tab = dynamic_cast<TabPrinter*>(this))

src/slic3r/GUI/TextureLibrary.cpp

@@ -0,0 +1,208 @@
+#include "TextureLibrary.hpp"
+
+#include <algorithm>
+#include <fstream>
+
+#include <boost/algorithm/string/case_conv.hpp>
+#include <boost/filesystem.hpp>
+#include <boost/log/trivial.hpp>
+#include <boost/nowide/fstream.hpp>
+#include <boost/system/error_code.hpp>
+
+#include <wx/image.h>
+
+#include "libslic3r/PNGReadWrite.hpp"
+#include "libslic3r/Utils.hpp"
+
+#include "slic3r/GUI/GUI.hpp"
+#include "slic3r/GUI/I18N.hpp"
+
+namespace Slic3r::GUI {
+
+namespace {
+
+// Extensions the picker will list. The shipped folder only ever contains .png; the rest are here
+// so a user who drops a .jpg straight into their own folder still sees it (load_texture_image_data()
+// converts anything it can open).
+bool is_image_file(const boost::filesystem::path &path)
+{
+    std::string ext = path.extension().string();
+    boost::algorithm::to_lower(ext);
+    return ext == ".png" || ext == ".jpg" || ext == ".jpeg" || ext == ".bmp";
+}
+
+void scan_dir(const boost::filesystem::path &dir, bool is_user, std::vector<TextureLibraryEntry> &out)
+{
+    boost::system::error_code ec;
+    if (!boost::filesystem::is_directory(dir, ec))
+        return;
+
+    const size_t first = out.size();
+    for (boost::filesystem::directory_iterator it(dir, ec), end; it != end && !ec; it.increment(ec)) {
+        if (!boost::filesystem::is_regular_file(it->path(), ec) || !is_image_file(it->path()))
+            continue;
+        out.push_back({ it->path().stem().string(), it->path().string(), is_user });
+    }
+    std::sort(out.begin() + first, out.end(),
+              [](const TextureLibraryEntry &a, const TextureLibraryEntry &b) { return a.name < b.name; });
+}
+
+// Slic3r::png only writes PNGs to a file, so the encode round-trips through a temp file rather than
+// staying in memory. It happens once per import / per texture pick, not per frame, so the I/O is
+// not worth avoiding with a second PNG encoder.
+bool encode_gray_png_bytes(const wxImage &image, std::vector<unsigned char> &out, std::string &error)
+{
+    const wxImage gray = image.ConvertToGreyscale();
+    const int     w    = gray.GetWidth();
+    const int     h    = gray.GetHeight();
+    if (w <= 0 || h <= 0) {
+        error = _u8L("The selected image is empty.");
+        return false;
+    }
+
+    // wxImage always stores 3 bytes per pixel; after ConvertToGreyscale the three are equal.
+    std::vector<uint8_t> pixels(size_t(w) * size_t(h));
+    const unsigned char *rgb = gray.GetData();
+    for (size_t i = 0; i < pixels.size(); ++i)
+        pixels[i] = rgb[i * 3];
+
+    const boost::filesystem::path tmp = boost::filesystem::temp_directory_path()
+        / boost::filesystem::unique_path("orca_texdisp_%%%%%%%%.png");
+    if (!Slic3r::png::write_gray_to_file(tmp.string(), size_t(w), size_t(h), pixels)) {
+        error = _u8L("Failed to prepare the texture for use.");
+        return false;
+    }
+
+    {
+        std::ifstream ifs(tmp.string(), std::ios::binary);
+        out.assign(std::istreambuf_iterator<char>(ifs), std::istreambuf_iterator<char>());
+    }
+    boost::system::error_code ec;
+    boost::filesystem::remove(tmp, ec);
+
+    if (out.empty()) {
+        error = _u8L("Failed to prepare the texture for use.");
+        return false;
+    }
+    return true;
+}
+
+std::vector<unsigned char> read_file_bytes(const std::string &path)
+{
+    std::ifstream ifs(path, std::ios::binary);
+    return std::vector<unsigned char>(std::istreambuf_iterator<char>(ifs), std::istreambuf_iterator<char>());
+}
+
+// True if these bytes are already the 8-bit grayscale PNG libslic3r can decode, i.e. can be stored
+// on a layer as-is. Mirrors exactly what decode_height_texture() accepts.
+bool is_supported_height_map(const std::vector<unsigned char> &bytes)
+{
+    if (bytes.empty())
+        return false;
+    const png::ReadBuf rbuf{ bytes.data(), bytes.size() };
+    if (!png::is_png(rbuf))
+        return false;
+    png::ImageGreyscale img;
+    return png::decode_png(rbuf, img) && img.cols > 0 && img.rows > 0;
+}
+
+std::vector<TextureLibraryEntry> g_library;
+bool                             g_library_scanned = false;
+
+} // namespace
+
+std::string user_texture_dir()
+{
+    const boost::filesystem::path dir = boost::filesystem::path(Slic3r::data_dir()) / "textures" / "displacement";
+    boost::system::error_code     ec;
+    boost::filesystem::create_directories(dir, ec);
+    if (ec) {
+        BOOST_LOG_TRIVIAL(error) << "Could not create the user texture directory " << dir.string() << ": " << ec.message();
+        return {};
+    }
+    return dir.string();
+}
+
+const std::vector<TextureLibraryEntry> &texture_library(bool force_rescan)
+{
+    if (g_library_scanned && !force_rescan)
+        return g_library;
+
+    g_library.clear();
+    scan_dir(boost::filesystem::path(Slic3r::resources_dir()) / "textures" / "displacement", false, g_library);
+    const std::string user_dir = user_texture_dir();
+    if (!user_dir.empty())
+        scan_dir(boost::filesystem::path(user_dir), true, g_library);
+
+    g_library_scanned = true;
+    return g_library;
+}
+
+std::optional<TextureLibraryEntry> import_texture_to_library(const std::string &source_path, std::string &error)
+{
+    const std::string user_dir = user_texture_dir();
+    if (user_dir.empty()) {
+        error = _u8L("Could not create the folder for imported textures.");
+        return std::nullopt;
+    }
+
+    wxImage image;
+    if (!image.LoadFile(from_u8(source_path)) || !image.IsOk()) {
+        error = _u8L("Could not load the selected image.");
+        return std::nullopt;
+    }
+
+    std::vector<unsigned char> bytes;
+    if (!encode_gray_png_bytes(image, bytes, error))
+        return std::nullopt;
+
+    // Never overwrite an existing texture (the user's or, if they picked the same name twice, their
+    // own earlier import) - uniquify instead.
+    const std::string       stem = boost::filesystem::path(source_path).stem().string();
+    boost::filesystem::path dest = boost::filesystem::path(user_dir) / (stem + ".png");
+    for (int i = 2; boost::filesystem::exists(dest); ++i)
+        dest = boost::filesystem::path(user_dir) / (stem + " (" + std::to_string(i) + ").png");
+
+    {
+        boost::nowide::ofstream ofs(dest.string(), std::ios::binary);
+        ofs.write(reinterpret_cast<const char *>(bytes.data()), std::streamsize(bytes.size()));
+        if (!ofs.good()) {
+            error = _u8L("Failed to save the imported texture.");
+            return std::nullopt;
+        }
+    }
+
+    texture_library(true); // pick the new file up
+    const std::string dest_str = dest.string();
+    for (const TextureLibraryEntry &e : g_library)
+        if (e.path == dest_str)
+            return e;
+
+    error = _u8L("Failed to save the imported texture.");
+    return std::nullopt;
+}
+
+std::shared_ptr<std::vector<unsigned char>> load_texture_image_data(const std::string &path, std::string &error)
+{
+    std::vector<unsigned char> bytes = read_file_bytes(path);
+    if (bytes.empty()) {
+        error = _u8L("Could not read the texture file.");
+        return nullptr;
+    }
+    if (is_supported_height_map(bytes))
+        return std::make_shared<std::vector<unsigned char>>(std::move(bytes));
+
+    // Not an 8-bit grayscale PNG (a colour image somebody copied into the folder by hand, say):
+    // convert it the same way an import would, but leave the file on disk alone.
+    wxImage image;
+    if (!image.LoadFile(from_u8(path)) || !image.IsOk()) {
+        error = _u8L("Could not load the selected image.");
+        return nullptr;
+    }
+    std::vector<unsigned char> converted;
+    if (!encode_gray_png_bytes(image, converted, error))
+        return nullptr;
+    return std::make_shared<std::vector<unsigned char>>(std::move(converted));
+}
+
+} // namespace Slic3r::GUI

src/slic3r/GUI/TextureLibrary.hpp

@@ -0,0 +1,50 @@
+#ifndef slic3r_TextureLibrary_hpp_
+#define slic3r_TextureLibrary_hpp_
+
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace Slic3r::GUI {
+
+// One selectable height-map texture in the texture-displacement gizmo's texture picker.
+struct TextureLibraryEntry
+{
+    std::string name;    // display name (the file's stem, e.g. "Wood Grain")
+    std::string path;    // absolute path on disk
+    bool        is_user; // imported by the user, as opposed to shipped with OrcaSlicer
+};
+
+// Every available height-map texture: the ones shipped in resources/textures/displacement first,
+// then the user's own from <data_dir>/textures/displacement, each group sorted by name.
+//
+// The two live in separate directories deliberately: an app update replaces the resources tree
+// wholesale, so anything the user imported has to sit somewhere that update can never overwrite or
+// delete. `is_user` is what the picker uses to show them under separate headings.
+//
+// Scanned once and cached. Pass force_rescan after an import, or to pick up a file the user dropped
+// into either folder by hand while the app was running.
+const std::vector<TextureLibraryEntry> &texture_library(bool force_rescan = false);
+
+// <data_dir>/textures/displacement, created if it does not exist yet. Empty string on failure.
+std::string user_texture_dir();
+
+// Reads any image format wxWidgets can open, converts it to the 8-bit grayscale PNG that
+// libslic3r's decode_height_texture() understands, and saves it into user_texture_dir() (uniquified
+// if that name is taken). The conversion has to happen here rather than in libslic3r, which has no
+// image toolkit and so only ever handles the one already-normalized format.
+//
+// Returns the newly imported entry, or nullopt with `error` set. `source_path` is only read.
+std::optional<TextureLibraryEntry> import_texture_to_library(const std::string &source_path, std::string &error);
+
+// Encoded bytes of `path`, ready to hand to TextureDisplacementLayer::image_data. Files already in
+// the supported 8-bit grayscale PNG form (everything in the two library folders, by construction)
+// are passed through verbatim; anything else - e.g. a colour PNG the user copied into the folder
+// by hand - is converted on the fly, so a valid image never silently produces a blank layer.
+// Returns nullptr with `error` set if the file cannot be read or decoded at all.
+std::shared_ptr<std::vector<unsigned char>> load_texture_image_data(const std::string &path, std::string &error);
+
+} // namespace Slic3r::GUI
+
+#endif // slic3r_TextureLibrary_hpp_

src/slic3r/GUI/TextureProjectorFrame.cpp

@@ -0,0 +1,97 @@
+#include "TextureProjectorFrame.hpp"
+
+#include <algorithm>
+
+#include <wx/dcclient.h>
+#include <wx/image.h>
+
+#include "slic3r/GUI/GUI_App.hpp"
+#include "slic3r/GUI/I18N.hpp"
+
+namespace Slic3r { namespace GUI {
+
+TextureProjectorFrame::TextureProjectorFrame(wxWindow *parent)
+    : wxFrame(parent, wxID_ANY, _L("Projection frame - drag over the model, then Apply"), wxDefaultPosition,
+              wxSize(360, 360),
+              // Caption and resize border so moving and sizing are the native gestures the user
+              // already knows - "align it by moving the window" only works if the window moves the
+              // ordinary way. FLOAT_ON_PARENT keeps it above the 3D view without the antisocial
+              // always-on-top-of-everything behaviour of wxSTAY_ON_TOP.
+              wxCAPTION | wxRESIZE_BORDER | wxCLOSE_BOX | wxFRAME_NO_TASKBAR | wxFRAME_FLOAT_ON_PARENT)
+{
+    SetBackgroundStyle(wxBG_STYLE_PAINT);
+    Bind(wxEVT_PAINT, &TextureProjectorFrame::on_paint, this);
+    // A resize changes the gate, so the texture has to be re-stretched under it.
+    Bind(wxEVT_SIZE, [this](wxSizeEvent &evt) { Refresh(); evt.Skip(); });
+    SetTransparent(wxByte(m_alpha));
+
+    // Hide rather than destroy: the gizmo owns this window's lifetime, and reopening should keep the
+    // frame exactly where it was left - its position is the placement.
+    Bind(wxEVT_CLOSE_WINDOW, [this](wxCloseEvent &evt) {
+        if (evt.CanVeto()) {
+            evt.Veto();
+            Hide();
+        } else
+            evt.Skip();
+    });
+}
+
+void TextureProjectorFrame::set_texture(const std::vector<unsigned char> &gray, int width, int height)
+{
+    if (width <= 0 || height <= 0 || gray.size() < size_t(width) * size_t(height)) {
+        m_bitmap = wxBitmap();
+        Refresh();
+        return;
+    }
+
+    wxImage img(width, height);
+    unsigned char *dst = img.GetData();
+    for (size_t i = 0, n = size_t(width) * size_t(height); i < n; ++i) {
+        const unsigned char v = gray[i];
+        dst[i * 3 + 0] = v;
+        dst[i * 3 + 1] = v;
+        dst[i * 3 + 2] = v;
+    }
+    m_bitmap = wxBitmap(img);
+    Refresh();
+}
+
+void TextureProjectorFrame::set_opacity(int alpha)
+{
+    m_alpha = std::clamp(alpha, 20, 255);
+    SetTransparent(wxByte(m_alpha));
+    Refresh();
+}
+
+wxRect TextureProjectorFrame::client_rect_on_screen() const
+{
+    const wxSize sz = GetClientSize();
+    return wxRect(ClientToScreen(wxPoint(0, 0)), sz);
+}
+
+void TextureProjectorFrame::on_paint(wxPaintEvent &)
+{
+    wxPaintDC    dc(this);
+    const wxSize sz = GetClientSize();
+    if (sz.x <= 0 || sz.y <= 0)
+        return;
+
+    dc.SetBackground(wxBrush(wxColour(20, 20, 20)));
+    dc.Clear();
+
+    if (m_bitmap.IsOk()) {
+        // Stretched to fill the client area rather than kept at its own aspect: the gate maps to the
+        // uv unit square whatever its shape, so a non-square window genuinely does project a
+        // stretched texture. Showing it any other way would misrepresent the bake.
+        wxImage scaled = m_bitmap.ConvertToImage().Scale(sz.x, sz.y, wxIMAGE_QUALITY_NORMAL);
+        dc.DrawBitmap(wxBitmap(scaled), 0, 0, false);
+    }
+
+    // The border is the projection's hard edge, so it is drawn explicitly - with the window
+    // translucent, the native frame alone reads poorly against a busy 3D scene.
+    dc.SetPen(wxPen(wxColour(0, 200, 180), 2));
+    dc.SetBrush(*wxTRANSPARENT_BRUSH);
+    dc.DrawRectangle(0, 0, sz.x, sz.y);
+}
+
+}} // namespace Slic3r::GUI

src/slic3r/GUI/TextureProjectorFrame.hpp

@@ -0,0 +1,56 @@
+#ifndef slic3r_TextureProjectorFrame_hpp_
+#define slic3r_TextureProjectorFrame_hpp_
+
+// The projection-frame overlay for TextureProjectionMethod::ViewProjected.
+//
+// A semi-transparent, resizable window that the user drags over the 3D view like a slide projector's
+// gate: whatever the model shows through this window is what the texture is projected onto, and the
+// window's border is the hard edge of the projection. "Apply" then reads the window's client
+// rectangle, converts it into the 3D canvas's own pixel space, and builds an exact projective map
+// from it (see GLGizmoTextureDisplacement::apply_projection_frame()).
+//
+// The window itself is deliberately dumb - it owns no placement state and reports nothing
+// continuously. Its position and size *are* the placement, and they are read on demand at Apply,
+// which is also when the (expensive) visible-facet selection runs. Moving the window is therefore
+// free, and nothing recomputes until the user asks for it.
+//
+// Plain 2D (wxGraphicsContext), not a wxGLCanvas: a second GL canvas would have to share the app's
+// one real wxGLContext, the cause of bugs #10 and #14 in TEXTURE_DISPLACEMENT.md. A paint-DC window
+// has no such failure mode, and this one only ever draws a bitmap and a border.
+
+#include <vector>
+
+#include <wx/bitmap.h>
+#include <wx/frame.h>
+
+namespace Slic3r { namespace GUI {
+
+class TextureProjectorFrame : public wxFrame
+{
+public:
+    explicit TextureProjectorFrame(wxWindow *parent);
+
+    // The same 8-bit grayscale pixels build_texture_displacement() samples, so what is aligned here
+    // is what gets baked. Pass width/height <= 0 to clear it.
+    void set_texture(const std::vector<unsigned char> &grayscale_pixels, int width, int height);
+
+    // Whole-window opacity, 0..255. Low enough to see the model through it, high enough to judge
+    // where the texture lands - the useful range is roughly 60..200.
+    void set_opacity(int alpha);
+    int  opacity() const { return m_alpha; }
+
+    // The client area (the gate itself, excluding caption and borders) in screen coordinates. This
+    // is what the projection is built from, so it deliberately excludes the window decorations -
+    // the user aligns what they see, which is the client area.
+    wxRect client_rect_on_screen() const;
+
+private:
+    wxBitmap m_bitmap;
+    int      m_alpha = 140;
+
+    void on_paint(wxPaintEvent &);
+};
+
+}} // namespace Slic3r::GUI
+
+#endif // slic3r_TextureProjectorFrame_hpp_

src/slic3r/GUI/UVEditorCanvas.hpp

@@ -0,0 +1,340 @@
+#ifndef slic3r_UVEditorCanvas_hpp_
+#define slic3r_UVEditorCanvas_hpp_
+
+#include <algorithm>
+#include <functional>
+#include <utility>
+#include <vector>
+
+// Must come before wx/glcanvas.h in any translation unit that includes this header: glcanvas.h
+// pulls in the platform's real GL/gl.h, and glad/gl.h errors out if that happens first (it wants
+// to be the one to define the standard include guards GL/gl.h itself defines).
+#include <glad/gl.h>
+#include <wx/glcanvas.h>
+#include <wx/panel.h>
+#include <wx/button.h>
+#include <wx/tglbtn.h>
+#include <wx/stattext.h>
+#include <wx/sizer.h>
+
+#include "libslic3r/Point.hpp"
+#include "GLModel.hpp"
+#include "GLTexture.hpp"
+
+namespace Slic3r::GUI {
+
+// Standalone 2D viewer/editor for a flattened (UV-unwrapped) mesh patch - shows the result of
+// GLGizmoTextureDisplacement's LSCM projection method as its own resizable pane (see Plater's
+// "uv_editor" AUI pane) rather than folding 2D UV-space rendering into the main 3D viewport.
+//
+// Islands can be laid out by hand, roughly the way Blender's UV editor works: click one to select
+// it, drag to move it, right-drag or press R to rotate it, S to scale it, both about its own centre.
+// Islands are free to overlap - nothing re-packs them behind the user's back. The texture underneath
+// is always drawn upright and axis-aligned, and it is the islands that move over it, which is what
+// makes "rotate this island" a meaningful gesture rather than just spinning the whole texture.
+//
+// **Geometry is uploaded in the unwrap's own (raw, mm) coordinates, once**, and each island is drawn
+// through its own affine matrix passed as a shader uniform. That matters: a patch can easily run to
+// a million triangles, and the earlier design - which pre-transformed every UV on the CPU and
+// re-uploaded the whole wireframe on every mouse-move event - made a drag cost a couple of hundred
+// milliseconds per frame. Moving an island now touches a 2x3 matrix and nothing else.
+//
+// Uses the app's single shared wxGLContext (via wxGetApp().init_glcontext(), the same call
+// View3D/Preview/AssembleView each make in GUI_Preview.cpp) rather than an independent context of
+// its own, specifically so it can reuse the app's already-registered "flat"/"flat_texture"
+// shaders and GLModel as-is - GLModel::render() looks up its shader via a GUI_App-wide "current
+// shader", which only means anything for canvases sharing the app's one real GL context.
+class UVEditorCanvas : public wxGLCanvas
+{
+public:
+    explicit UVEditorCanvas(wxWindow *parent);
+
+    // Maps one island's raw unwrap coordinate to a texture UV: the island's own hand placement and
+    // then the layer's tiling/rotation/offset, composed into a single affine (columns: x basis,
+    // y basis, translation).
+    using IslandTransform = Eigen::Matrix<float, 2, 3>;
+
+    // The unwrap to display, in the unwrap's own mm coordinates - *not* texture UVs. Changing this
+    // is the expensive path (it rebuilds every vertex buffer), so it must only be called when the
+    // unwrap itself changes, never merely because an island moved. Pass an empty `indices` to show
+    // nothing.
+    struct Islands
+    {
+        std::vector<Vec2f>               uvs;
+        std::vector<Vec3i32>             indices;
+        std::vector<int>                 vertex_island;  // per uv
+        std::vector<std::pair<int, int>> boundary_edges; // island outlines, indices into uvs
+        int                              island_count = 0;
+    };
+    void set_islands(Islands islands);
+
+    // The cheap path: one transform per island. Safe to call on every mouse-move of a drag.
+    void set_island_transforms(std::vector<IslandTransform> transforms);
+
+    // One fill colour per island, overriding the default light-green wash - used to paint the UV
+    // distortion heatmap over the islands when the gizmo's "Distortion" check mode is on (#7/#14).
+    // Pass empty to go back to the default wash. Cheap: it never touches a vertex buffer.
+    void set_island_fill_colors(std::vector<ColorRGBA> colors);
+
+    // The layer's own tiling scale and rotation. Needed to map a gesture, which happens in texture-UV
+    // space, back into the unwrap's mm space - which is where a TextureIsland's offset actually
+    // lives (see apply_uv_transform()). The tile settings come along because the background has to
+    // repeat exactly the way the height sampler does, or the pane would stop showing what gets baked.
+    void set_uv_transform(float tiling_scale, float rotation_deg, bool tile_enabled, bool tile_mirrored);
+
+    // Same 8-bit grayscale pixels build_texture_displacement()'s height sampling uses, shown
+    // beneath the wireframe (expanded to RGBA on upload) so the unwrap can be checked against the
+    // texture it will actually sample. Pass width/height <= 0 to clear it.
+    void set_background_texture(const std::vector<unsigned char> &grayscale_pixels, int width, int height);
+
+    // Snap a dragged island's boundary to a neighbouring island's when they come close (#2). Off is
+    // the honest default for overlap-friendly layouts; the pane toolbar toggles it.
+    void set_snap_enabled(bool enabled) { m_snap_enabled = enabled; }
+    bool snap_enabled() const { return m_snap_enabled; }
+
+    // High-level actions the pane toolbar triggers. The canvas handles the view-only ones (framing,
+    // the snap toggle) itself and forwards the rest to whoever owns the island data (the gizmo), via
+    // the command callback - the canvas has the selection and the view, the gizmo has the layer.
+    enum class Command { FrameAll, ToggleSnap, AverageScale, CutSelectedIsland, ProjectFromView, JoinSelected, UnjoinSelected };
+    void run_command(Command cmd);
+    using CommandFn = std::function<void(Command)>;
+    void set_command_callback(CommandFn fn) { m_on_command = std::move(fn); }
+
+    // Called whenever the one-line status/hint text changes (current gesture + the shortcuts that
+    // apply right now), so the pane can show it Blender-style along the bottom.
+    using StatusFn = std::function<void(const wxString &)>;
+    void set_status_callback(StatusFn fn) { m_on_status = std::move(fn); }
+
+    // Reports an island edit as it happens. The deltas are *incremental* (one mouse event's worth)
+    // and already converted into the units a TextureIsland stores - unwrap mm, degrees, and a scale
+    // *factor* to multiply the island's existing scale by. They are incremental on purpose: the owner
+    // applies them and hands back fresh transforms, and if the gesture tracked geometry rather than
+    // raw mouse motion that round trip would feed back into itself. `finished` marks the end of a
+    // gesture, so the owner can rebuild the 3D preview once rather than on every motion event.
+    using IslandEditFn =
+        std::function<void(int island, const Vec2f &offset_delta, float rotation_delta, float scale_factor, bool finished)>;
+    void set_island_edit_callback(IslandEditFn fn) { m_on_island_edit = std::move(fn); }
+
+    // What a click grabs: a whole island (move/rotate/scale, groups move together), a single vertex, or
+    // a single edge (both its endpoints). Vertex/Edge are free-form UV editing - they move the actual
+    // unwrap coordinates, which the owner then folds into the layer's per-vertex UV overrides so the
+    // change is baked, not just shown (see set_vertex_edit_callback).
+    enum class SelectMode { Island, Vertex, Edge };
+    void       set_select_mode(SelectMode mode);
+    SelectMode select_mode() const { return m_select_mode; }
+
+    // Reports a committed vertex/edge edit: the list of (unwrapped-vertex index, its new raw-unwrap
+    // coordinate in mm). Fired once, on mouse release, since it re-solves the displacement preview; the
+    // pane shows the edit live from its own geometry in the meantime. The owner maps the unwrapped index
+    // to a mesh vertex (via the unwrap's source_vertex) and stores the override.
+    using UVVertexEditFn = std::function<void(const std::vector<std::pair<int, Vec2f>> &edits)>;
+    void set_vertex_edit_callback(UVVertexEditFn fn) { m_on_vertex_edit = std::move(fn); }
+
+    // The primary (last-clicked) island, still the pivot for rotate/scale and the target of the
+    // single-island toolbar commands (Cut/Join/Unjoin). -1 if nothing is selected.
+    int  selected_island() const { return m_selected_island; }
+    // The full multi-selection (Shift adds, Ctrl toggles). Always contains m_selected_island when it is
+    // >= 0. The gizmo reads this to decide which islands a drag moves together, unioned with each
+    // selected island's join group.
+    const std::vector<int> &selected_islands() const { return m_selection; }
+    void reset_view();
+
+private:
+    void on_paint(wxPaintEvent &evt);
+    void on_size(wxSizeEvent &evt);
+    void on_mouse(wxMouseEvent &evt);
+    void on_key(wxKeyEvent &evt);
+    void on_leave(wxMouseEvent &evt); // drops the +/- cursor hint when the pointer leaves the canvas
+    void on_erase_background(wxEraseEvent &evt) {} // required to avoid flicker on MSW, deliberately a no-op
+
+    void render();
+    void rebuild_island_models();
+    void rebuild_background_texture();
+    void rebuild_background_quad();
+    void rebuild_grid();
+    // The UV region worth looking at: every island, plus always at least the texture's first tile, so
+    // there is something sensibly framed even before anything is painted.
+    void content_bounds(Vec2f &min_uv, Vec2f &max_uv) const;
+    // Frames content_bounds(). Bound to Home, and run once each time an unwrap first appears.
+    void fit_view_to_content();
+
+    // Half-extents of the visible UV region. Split out because both rendering and every mouse
+    // gesture need them, and they have to agree exactly or picking lands in the wrong place.
+    void  view_half_extents(float &half_w, float &half_h) const;
+    Vec2f screen_to_uv(const wxPoint &px) const;
+    // Raw unwrap coordinate -> texture UV, through the island's own transform.
+    Vec2f island_uv(size_t vertex) const;
+    // The island under `uv`, or -1. Prefers the current selection when islands overlap, so that
+    // dragging one that sits under another doesn't hand the drag to its neighbour halfway through.
+    int   island_at(const Vec2f &uv) const;
+    // Nearest unwrapped vertex to `uv` within a screen-space threshold, or -1 (Vertex mode picking).
+    int   vertex_at(const Vec2f &uv) const;
+    // Nearest island-boundary edge to `uv` within a screen-space threshold, as its two unwrapped-vertex
+    // indices, or {-1,-1} (Edge mode picking).
+    std::pair<int, int> edge_at(const Vec2f &uv) const;
+    // Moves one unwrapped vertex by a texture-UV delta, converting it back into the vertex's own raw
+    // unwrap space through its island's inverse transform, and marks the mesh dirty so it redraws.
+    void  move_vertex_raw(int unwrapped_vertex, const Vec2f &delta_uv);
+    Vec2f island_centroid(int island) const;
+    // Converts a delta in texture-UV space into the unwrap's mm space, undoing the layer's scale and
+    // rotation - the inverse of what apply_uv_transform() did on the way in.
+    Vec2f uv_delta_to_unwrap(const Vec2f &delta_uv) const;
+    // The correction that would bring the selected island's nearest boundary vertex onto a boundary
+    // vertex of some *other* island, in texture-UV space. Zero if nothing is within reach (#2).
+    Vec2f snap_correction(int island) const;
+    void  end_gesture();
+    // Rebuilds the status line from the current gesture/selection and pushes it to m_on_status.
+    void  update_status();
+
+    wxGLContext *m_context = nullptr; // owned by OpenGLManager/GUI_App, not by this canvas
+
+    Islands                      m_islands;
+    std::vector<IslandTransform> m_transforms;
+    // Per-island fill colour override (distortion heatmap); empty means use the default wash (#7).
+    std::vector<ColorRGBA>       m_island_fill_colors;
+    // Boundary vertices per island, for snapping - a patch's boundary is a tiny fraction of it, and
+    // rescanning the whole uv array on every snap test would not be.
+    std::vector<std::vector<int>> m_island_boundary_verts;
+
+    bool m_mesh_dirty = true;
+    // One set of models per island, so an island can be drawn through its own transform. Built once
+    // per unwrap, never on a drag.
+    std::vector<GLModel> m_island_wireframe; // interior edges
+    std::vector<GLModel> m_island_boundary;  // outline
+    std::vector<GLModel> m_island_fill;      // filled, for the selected island's wash
+
+    GLModel m_tile_outline_glmodel; // the texture's first tile, [0,1]^2 - the "you are here"
+    GLModel m_grid_glmodel;
+    float   m_grid_step = 0.f; // the UV step m_grid_glmodel was built for; 0 = not built
+
+    float m_tiling_scale  = 1.f;
+    float m_rotation_deg  = 0.f;
+    bool  m_tile_enabled  = true;
+    bool  m_tile_mirrored = false;
+    bool  m_snap_enabled  = false;
+
+    std::vector<unsigned char> m_background_pixels; // RGBA, expanded from the grayscale input
+    int                        m_background_width = 0, m_background_height = 0;
+    bool                       m_background_dirty = false;     // the pixels need (re)uploading
+    bool                       m_background_quad_dirty = true; // only the quad's extent changed
+    GLTexture                  m_background_texture;
+    // Covers content_bounds(), not just [0,1]: the unwrap is packed in mm and then divided by the
+    // layer's tile size, so it routinely spans many tiles, and a single-unit-square backdrop would
+    // leave most of the islands sitting over bare background. Texcoord == position, so the GL wrap
+    // mode repeats it exactly the way DecodedHeightTexture::sample() does.
+    GLModel                    m_background_glmodel;
+
+    // 2D pan/zoom. m_pan is the UV-space point at the center of the view, m_zoom half the UV-space
+    // extent visible across the shorter screen edge. v runs *down* the screen, matching both the
+    // texture's own row order and every other UV editor's convention.
+    Vec2f m_pan       = Vec2f(0.5f, 0.5f);
+    float m_zoom      = 0.75f;
+    bool  m_needs_fit = true; // fit the view to the next unwrap that arrives
+
+    enum class Gesture
+    {
+        None,
+        Pan,
+        MoveIsland,
+        RotateIsland,      // right-drag: rotation tracks the mouse, ends when the button is released
+        RotateIslandModal, // 'R': rotation tracks the mouse until a click confirms or Esc cancels
+        ScaleIslandModal,  // 'S': likewise, distance from the centre drives the scale
+        MoveVertex,        // Vertex mode: drag one unwrapped vertex
+        MoveEdge,          // Edge mode: drag both endpoints of one boundary edge
+    };
+    Gesture m_gesture         = Gesture::None;
+
+    SelectMode          m_select_mode  = SelectMode::Island;
+    // The sub-element being edited in Vertex/Edge mode (unwrapped-vertex indices), or -1/{-1,-1}. This
+    // is the *primary* (last-picked) element of the multi-selection below.
+    int                 m_active_vertex = -1;
+    std::pair<int, int> m_active_edge{ -1, -1 };
+    // Multi-selection for Vertex/Edge modes, mirroring the island selection: plain click replaces, Shift
+    // adds, Ctrl toggles, and a drag moves the whole set together. m_active_vertex/m_active_edge stay the
+    // primary. Kept as small vectors (tiny, and order doesn't matter here).
+    std::vector<int>                 m_sel_vertices;
+    std::vector<std::pair<int, int>> m_sel_edges;
+    bool is_vertex_selected(int v) const
+    {
+        return std::find(m_sel_vertices.begin(), m_sel_vertices.end(), v) != m_sel_vertices.end();
+    }
+    bool is_edge_selected(const std::pair<int, int> &e) const
+    {
+        return std::find(m_sel_edges.begin(), m_sel_edges.end(), e) != m_sel_edges.end();
+    }
+    // Unique unwrapped-vertex endpoints of every selected edge (an endpoint shared by two selected edges
+    // is returned once, so a drag doesn't move it twice).
+    std::vector<int> selected_edge_endpoints() const;
+    // Last known mouse position over the canvas, and whether the pointer is currently inside it. Used to
+    // draw the +/- add/remove sign next to the cursor in Vertex/Edge mode.
+    wxPoint m_cursor_px{ 0, 0 };
+    bool    m_cursor_inside = false;
+    // Set once a Vertex/Edge drag actually moves, so a bare click (select without drag) doesn't commit a
+    // no-op edit and take an undo snapshot for nothing.
+    bool                m_vertex_edit_moved = false;
+    // Lazily-built small filled square, drawn at an edited/hovered vertex as a handle.
+    GLModel m_vertex_marker_glmodel;
+    // Rebuilt each frame at the cursor while a +/- add-remove hint is shown (Vertex/Edge mode).
+    GLModel m_cursor_sign_glmodel;
+    int     m_selected_island = -1;
+    // The full multi-selection; m_selected_island is its primary (last-clicked) member. Kept as a small
+    // vector rather than a set because it is tiny and iteration order (primary last) is convenient.
+    std::vector<int> m_selection;
+    bool             is_selected(int island) const
+    {
+        return std::find(m_selection.begin(), m_selection.end(), island) != m_selection.end();
+    }
+    wxPoint m_drag_last_px;
+    Vec2f   m_gesture_last_uv    = Vec2f::Zero();
+    float   m_gesture_last_angle = 0.f;
+    float   m_gesture_last_dist  = 0.f;
+    // Rotation is tracked as two running totals over the gesture: the raw mouse rotation, and how much
+    // has actually been applied. With Shift held the applied total is quantised to 15-degree steps
+    // (Blender-style angle snapping), so the two diverge - and driving the applied total off the raw
+    // one, rather than snapping each incremental delta, is what makes the snap stable instead of
+    // juddering. The raw/applied split also survives crossing +/-180 degrees, which a single wrapped
+    // angle would not. m_rot_applied doubles as the modal-rotate undo amount for Esc.
+    float   m_rot_raw_deg       = 0.f;
+    float   m_rot_applied_deg   = 0.f;
+    // The island's absolute on-screen rotation when the gesture began (decoded from its transform), so
+    // Shift can snap to *global* 15-degree marks (0/15/30...) rather than 15 degrees relative to
+    // wherever the island happened to start (#10). Also drives the angle read-out and the dial.
+    float   m_rot_base_deg      = 0.f;
+    float   m_rot_display_deg   = 0.f; // current absolute angle, for the status line and dial needle
+    float   m_modal_scale_accum = 1.f; // so Esc can undo exactly what the modal scale applied, as a factor
+
+    // A protractor drawn around the island while it rotates: a ring, a tick every 15 degrees, and a
+    // needle at the current angle, so the rotation is legible (#11). Rebuilt each frame during a
+    // rotation gesture (cheap: a few hundred short lines) and left empty otherwise.
+    GLModel m_dial_glmodel;
+    void    rebuild_rotation_dial();
+    // The island's current absolute rotation in degrees, decoded from its transform's first column.
+    float   island_rotation_deg(int island) const;
+
+    IslandEditFn   m_on_island_edit;
+    UVVertexEditFn m_on_vertex_edit;
+    CommandFn      m_on_command;
+    StatusFn       m_on_status;
+};
+
+// Hosts a UVEditorCanvas together with a small icon toolbar (frame, snap, average scale, cut,
+// project-from-view) and a Blender-style status line along the bottom that names the current gesture
+// and the shortcuts in play (#18). This is what actually goes into Plater's "uv_editor" AUI pane;
+// the gizmo still talks to the inner canvas, reached via canvas().
+class UVEditorPanel : public wxPanel
+{
+public:
+    explicit UVEditorPanel(wxWindow *parent);
+    UVEditorCanvas *canvas() { return m_canvas; }
+
+private:
+    void on_tool(wxCommandEvent &evt);
+
+    UVEditorCanvas  *m_canvas = nullptr;
+    wxToggleButton  *m_snap_button = nullptr;
+    wxStaticText    *m_status = nullptr;
+};
+
+} // namespace Slic3r::GUI
+
+#endif // slic3r_UVEditorCanvas_hpp_

src/slic3r/plugin/PluginConfig.cpp

@@ -5,6 +5,7 @@
 #include <boost/log/trivial.hpp>
 #include <boost/nowide/fstream.hpp>
 
+#include <libslic3r/Config.hpp>
 #include <libslic3r/PresetBundle.hpp>
 #include <libslic3r/PrintConfig.hpp>
 #include <slic3r/GUI/GUI.hpp>
@@ -164,6 +165,20 @@ bool CapabilityConfigDocument::erase(const PluginCapabilityId& id)
     return erased;
 }
 
+bool CapabilityConfigDocument::prune_unreferenced(const std::set<std::pair<PluginCapabilityType, std::string>>& referenced)
+{
+    bool changed = false;
+    for (auto it = m_entries.begin(); it != m_entries.end();) {
+        if (referenced.count({it->first.type, it->first.name}) != 0) {
+            ++it;
+        } else {
+            it      = m_entries.erase(it);
+            changed = true;
+        }
+    }
+    return changed;
+}
+
 bool CapabilityConfigDocument::empty() const
 {
     return m_entries.empty() && m_opaque_entries.empty();
@@ -342,6 +357,50 @@ std::string serialize_plugin_overrides(const CapabilityConfigDocument& document)
     return document.empty() ? std::string() : document.serialize_entries().dump();
 }
 
+bool prune_stale_plugin_overrides(DynamicConfig& config)
+{
+    const auto* overrides_opt = dynamic_cast<const ConfigOptionString*>(config.option(PLUGIN_OVERRIDES_OPTION_KEY));
+    if (overrides_opt == nullptr || overrides_opt->value.empty())
+        return false;
+
+    CapabilityConfigDocument overrides;
+    std::string              error;
+    if (!parse_plugin_overrides(overrides_opt->value, overrides, error)) {
+        // Malformed text is not ours to fix up here: leave it untouched rather than risk
+        // discarding data the user might still be able to recover.
+        BOOST_LOG_TRIVIAL(error) << "prune_stale_plugin_overrides: " << error;
+        return false;
+    }
+
+    // Capability names currently referenced by a plugin-backed option's value(s) — e.g.
+    // slicing_pipeline_plugin's ConfigOptionStrings entries name SlicingPipeline capabilities
+    // directly, the same raw values save_plugin_collection() resolves into the "plugins" manifest.
+    std::set<std::pair<PluginCapabilityType, std::string>> referenced;
+    const ConfigDef* def = config.def();
+    for (const std::string& opt_key : config.keys()) {
+        const ConfigOptionDef* opt_def = def != nullptr ? def->get(opt_key) : nullptr;
+        if (opt_def == nullptr || !opt_def->is_plugin_backed())
+            continue;
+
+        const ConfigOption*        opt  = config.option(opt_key);
+        const PluginCapabilityType type = plugin_capability_type_from_string(opt_def->plugin_type);
+        if (const auto* string_opt = dynamic_cast<const ConfigOptionString*>(opt)) {
+            if (!string_opt->value.empty())
+                referenced.emplace(type, string_opt->value);
+        } else if (const auto* vector_opt = dynamic_cast<const ConfigOptionVectorBase*>(opt)) {
+            for (const std::string& value : vector_opt->vserialize())
+                if (!value.empty())
+                    referenced.emplace(type, value);
+        }
+    }
+
+    if (!overrides.prune_unreferenced(referenced))
+        return false;
+
+    config.set_key_value(PLUGIN_OVERRIDES_OPTION_KEY, new ConfigOptionString(serialize_plugin_overrides(overrides)));
+    return true;
+}
+
 EffectiveCapabilityConfig PresetPluginConfigService::get_effective_config(const CapabilityConfigDocument&   overrides,
                                                                          const PluginCapabilityId& id) const
 {

src/slic3r/plugin/PluginConfig.hpp

@@ -8,7 +8,9 @@
 #include <map>
 #include <mutex>
 #include <optional>
+#include <set>
 #include <string>
+#include <utility>
 #include <vector>
 
 #define PLUGIN_CONFIG_DIR "config.json"
@@ -16,6 +18,7 @@
 namespace Slic3r {
 
 class Preset;
+class DynamicConfig;
 struct CapabilityConfigEntry
 {
     PluginCapabilityId id;
@@ -35,6 +38,9 @@ public:
     bool                                 contains(const PluginCapabilityId& id) const;
     bool                                 upsert(CapabilityConfigEntry entry);
     bool                                 erase(const PluginCapabilityId& id);
+    // Drops every entry whose (type, name) is not in `referenced`, e.g. capabilities a preset's
+    // plugin-backed options no longer name. Returns true if anything was removed.
+    bool                                 prune_unreferenced(const std::set<std::pair<PluginCapabilityType, std::string>>& referenced);
     bool                                 empty() const;
     nlohmann::json                       serialize_entries() const;
     nlohmann::json                       root_json() const;
@@ -50,6 +56,14 @@ std::string plugin_overrides_of(const Preset& preset);
 bool parse_plugin_overrides(const std::string& raw, CapabilityConfigDocument& document, std::string& error);
 std::string serialize_plugin_overrides(const CapabilityConfigDocument& document);
 
+// Drops plugin_config_overrides entries for capabilities no longer named by any plugin-backed
+// option's current value in `config` (e.g. slicing_pipeline_plugin cleared or switched to a
+// different capability), and writes the result back if anything changed. Called wherever a
+// plugin-backed option's value changes, so a saved preset never carries configuration for a
+// capability it no longer references. Returns true if `config` was modified, so a caller holding a
+// GUI field over PLUGIN_OVERRIDES_OPTION_KEY knows it must refresh that field's displayed value.
+bool prune_stale_plugin_overrides(DynamicConfig& config);
+
 struct EffectiveCapabilityConfig
 {
     PluginCapabilityId id;

tests/libslic3r/CMakeLists.txt

@@ -33,6 +33,7 @@ add_executable(${_TEST_NAME}_tests
     test_optimizers.cpp
     # test_png_io.cpp
     test_indexed_triangle_set.cpp
+    test_texture_displacement.cpp
     ../libnest2d/printer_parts.cpp
     )
 

tests/libslic3r/test_texture_displacement.cpp

@@ -0,0 +1,235 @@
+#define NOMINMAX
+#include <catch2/catch_all.hpp>
+
+#include <fstream>
+#include <boost/filesystem.hpp>
+
+#include "libslic3r/TextureDisplacement.hpp"
+#include "libslic3r/TriangleMesh.hpp"
+#include "libslic3r/TriangleSelector.hpp"
+#include "libslic3r/PNGReadWrite.hpp"
+
+using namespace Slic3r;
+using Catch::Matchers::WithinAbs;
+
+// Encodes a flat (uniform-value) grayscale image through Slic3r's own PNG writer/reader round
+// trip, so decode_height_texture() (which only accepts true 8-bit grayscale PNG) is guaranteed a
+// compatible file, exactly like the GUI's "Add texture" import path does.
+static std::shared_ptr<std::vector<unsigned char>> make_flat_gray_png(uint8_t value, size_t w = 4, size_t h = 4)
+{
+    std::vector<uint8_t> pixels(w * h, value);
+    const boost::filesystem::path tmp_path = boost::filesystem::temp_directory_path()
+        / boost::filesystem::unique_path("texdisp_test_%%%%%%%%.png");
+    REQUIRE(Slic3r::png::write_gray_to_file(tmp_path.string(), w, h, pixels));
+
+    std::vector<unsigned char> bytes;
+    {
+        std::ifstream ifs(tmp_path.string(), std::ios::binary);
+        bytes.assign(std::istreambuf_iterator<char>(ifs), std::istreambuf_iterator<char>());
+    }
+    boost::system::error_code ec;
+    boost::filesystem::remove(tmp_path, ec);
+
+    REQUIRE_FALSE(bytes.empty());
+    return std::make_shared<std::vector<unsigned char>>(std::move(bytes));
+}
+
+TEST_CASE("TextureDisplacement: decode_height_texture round-trips an 8-bit grayscale PNG", "[TextureDisplacement]")
+{
+    TextureDisplacementLayer layer;
+    layer.image_data = make_flat_gray_png(128, 4, 4);
+
+    DecodedHeightTexture tex = decode_height_texture(layer);
+    REQUIRE_FALSE(tex.empty());
+    CHECK(tex.width == 4);
+    CHECK(tex.height == 4);
+    REQUIRE_THAT(tex.sample(Vec2f(0.5f, 0.5f)), WithinAbs(128.0 / 255.0, 1.0 / 255.0));
+}
+
+TEST_CASE("TextureDisplacement: an empty layer list leaves the mesh unchanged", "[TextureDisplacement]")
+{
+    const indexed_triangle_set cube = its_make_cube(10., 10., 10.);
+    const std::vector<TextureDisplacementLayer> layers; // none
+    TextureDisplacementFacetsData facets{};              // all empty
+
+    const indexed_triangle_set result = build_texture_displacement(cube, layers, facets);
+
+    REQUIRE(result.vertices.size() == cube.vertices.size());
+    REQUIRE(result.indices.size() == cube.indices.size());
+    for (size_t i = 0; i < cube.vertices.size(); ++i)
+        for (int c = 0; c < 3; ++c)
+            CHECK(result.vertices[i](c) == cube.vertices[i](c));
+}
+
+TEST_CASE("TextureDisplacement: fully painting a mesh displaces every vertex along its own normal", "[TextureDisplacement]")
+{
+    const indexed_triangle_set cube = its_make_cube(10., 10., 10.);
+    const TriangleMesh cube_mesh(cube);
+
+    TriangleSelector selector(cube_mesh);
+    for (int f = 0; f < int(cube.indices.size()); ++f)
+        selector.set_facet(f, EnforcerBlockerType::ENFORCER);
+
+    TextureDisplacementFacetsData facets{};
+    facets[0] = selector.serialize();
+
+    TextureDisplacementLayer layer;
+    layer.slot        = 0;
+    layer.depth_mm    = 2.0f;
+    layer.tiling_scale = 5.0f;
+    layer.image_data  = make_flat_gray_png(255); // sample() == 1.0 everywhere -> full depth_mm displacement
+
+    const indexed_triangle_set result = build_texture_displacement(cube, {layer}, facets);
+
+    REQUIRE(result.vertices.size() == cube.vertices.size());
+    for (size_t i = 0; i < cube.vertices.size(); ++i) {
+        const float moved = (result.vertices[i] - cube.vertices[i]).norm();
+        CHECK_THAT(moved, WithinAbs(layer.depth_mm, 1e-3f));
+    }
+}
+
+// Paints every facet of `mesh` into a serialized mask, the way "Select whole model" does.
+static TriangleSelector::TriangleSplittingData paint_whole_mesh(const indexed_triangle_set &mesh)
+{
+    const TriangleMesh tm(mesh);
+    TriangleSelector   selector(tm);
+    for (int f = 0; f < int(mesh.indices.size()); ++f)
+        selector.set_facet(f, EnforcerBlockerType::ENFORCER);
+    return selector.serialize();
+}
+
+// Regression test for the bug this feature shipped with: with two layers painted over the same
+// area, the second one was silently dropped (its paint mask was remapped onto the mesh the first
+// layer had already displaced, which routinely produced an empty bitstream). Every layer is now
+// evaluated against the original mesh instead, so both must show up in the total.
+TEST_CASE("TextureDisplacement: a second layer over the same area is applied too", "[TextureDisplacement]")
+{
+    const indexed_triangle_set cube = its_make_cube(10., 10., 10.);
+
+    TextureDisplacementFacetsData facets{};
+    facets[0] = paint_whole_mesh(cube);
+    facets[1] = facets[0]; // both layers cover the whole cube
+
+    TextureDisplacementLayer base;
+    base.slot         = 0;
+    base.depth_mm     = 1.0f;
+    base.tiling_scale = 5.0f;
+    base.image_data   = make_flat_gray_png(255); // height 1.0 everywhere
+
+    TextureDisplacementLayer second = base;
+    second.slot       = 1;
+    second.depth_mm   = 0.5f;
+    second.blend_mode = TextureBlendMode::Add;
+
+    const indexed_triangle_set result = build_texture_displacement(cube, {base, second}, facets);
+
+    // Topology is preserved exactly, so vertices can be compared 1:1 with the input.
+    REQUIRE(result.vertices.size() == cube.vertices.size());
+    REQUIRE(result.indices.size() == cube.indices.size());
+    for (size_t i = 0; i < cube.vertices.size(); ++i)
+        CHECK_THAT((result.vertices[i] - cube.vertices[i]).norm(), WithinAbs(1.5f, 1e-3f)); // 1.0 + 0.5, not just 1.0
+}
+
+TEST_CASE("TextureDisplacement: blend modes combine a layer with the ones below it", "[TextureDisplacement]")
+{
+    const indexed_triangle_set cube = its_make_cube(10., 10., 10.);
+
+    TextureDisplacementFacetsData facets{};
+    facets[0] = paint_whole_mesh(cube);
+    facets[1] = facets[0];
+
+    TextureDisplacementLayer base;
+    base.slot         = 0;
+    base.depth_mm     = 2.0f;
+    base.tiling_scale = 5.0f;
+    base.image_data   = make_flat_gray_png(255); // -> contributes exactly +2.0 mm
+
+    TextureDisplacementLayer second = base;
+    second.slot     = 1;
+    second.depth_mm = 0.5f; // -> its own value is 0.5 mm
+
+    // Expected total displacement for each mode, given base = 2.0 mm and second = 0.5 mm. Multiply
+    // and Divide treat the layer's value as a factor relative to 1 mm (see TextureBlendMode).
+    const auto expected = GENERATE(table<TextureBlendMode, float>({
+        { TextureBlendMode::Add,      2.5f },  // 2.0 + 0.5
+        { TextureBlendMode::Subtract, 1.5f },  // 2.0 - 0.5
+        { TextureBlendMode::Multiply, 1.0f },  // 2.0 * 0.5
+        { TextureBlendMode::Divide,   4.0f },  // 2.0 / 0.5
+    }));
+    second.blend_mode = std::get<0>(expected);
+
+    const indexed_triangle_set result = build_texture_displacement(cube, {base, second}, facets);
+
+    REQUIRE(result.vertices.size() == cube.vertices.size());
+    for (size_t i = 0; i < cube.vertices.size(); ++i)
+        CHECK_THAT((result.vertices[i] - cube.vertices[i]).norm(), WithinAbs(std::get<1>(expected), 1e-3f));
+}
+
+TEST_CASE("TextureDisplacement: the lowest layer ignores its blend mode", "[TextureDisplacement]")
+{
+    // Multiply against the implicit zero base would annihilate the only layer present; the first
+    // layer to reach a vertex always starts the total off additively instead.
+    const indexed_triangle_set cube = its_make_cube(10., 10., 10.);
+
+    TextureDisplacementFacetsData facets{};
+    facets[0] = paint_whole_mesh(cube);
+
+    TextureDisplacementLayer layer;
+    layer.slot         = 0;
+    layer.depth_mm     = 2.0f;
+    layer.tiling_scale = 5.0f;
+    layer.blend_mode   = TextureBlendMode::Multiply;
+    layer.image_data   = make_flat_gray_png(255);
+
+    const indexed_triangle_set result = build_texture_displacement(cube, {layer}, facets);
+
+    for (size_t i = 0; i < cube.vertices.size(); ++i)
+        CHECK_THAT((result.vertices[i] - cube.vertices[i]).norm(), WithinAbs(2.0f, 1e-3f));
+}
+
+TEST_CASE("TextureDisplacement: boundary vertices shared with unpainted triangles are pinned", "[TextureDisplacement]")
+{
+    // A small triangle fan around a central vertex O, with 4 outer points A/B/C/D forming 4
+    // triangles T0..T3 in the XY plane. Only T0, T1, T2 are painted, T3 is left unpainted:
+    //   O: touches all 4 triangles (incl. unpainted T3)      -> boundary, must NOT move
+    //   A: touches T0 (painted) and T3 (unpainted)           -> boundary, must NOT move
+    //   D: touches T2 (painted) and T3 (unpainted)           -> boundary, must NOT move
+    //   B: touches only T0 and T1 (both painted)              -> interior, SHOULD move
+    //   C: touches only T1 and T2 (both painted)              -> interior, SHOULD move
+    indexed_triangle_set fan;
+    fan.vertices = { {0.f, 0.f, 0.f}, {1.f, 0.f, 0.f}, {0.f, 1.f, 0.f}, {-1.f, 0.f, 0.f}, {0.f, -1.f, 0.f} };
+    fan.indices  = { {0, 1, 2}, {0, 2, 3}, {0, 3, 4}, {0, 4, 1} };
+
+    const TriangleMesh fan_mesh(fan);
+    TriangleSelector    selector(fan_mesh);
+    selector.set_facet(0, EnforcerBlockerType::ENFORCER);
+    selector.set_facet(1, EnforcerBlockerType::ENFORCER);
+    selector.set_facet(2, EnforcerBlockerType::ENFORCER);
+    // facet 3 (T3) is left at its default EnforcerBlockerType::NONE.
+
+    TextureDisplacementFacetsData facets{};
+    facets[0] = selector.serialize();
+
+    TextureDisplacementLayer layer;
+    layer.slot        = 0;
+    layer.depth_mm    = 1.0f;
+    layer.tiling_scale = 5.0f;
+    layer.image_data  = make_flat_gray_png(255);
+
+    const indexed_triangle_set result = build_texture_displacement(fan, {layer}, facets);
+
+    // Find each named vertex's post-bake position by matching the original (pinned vertices keep
+    // their exact original position; moved ones won't match any original position anymore).
+    auto still_at_original_position = [&](const Vec3f &original) {
+        for (const Vec3f &v : result.vertices)
+            if ((v - original).norm() < 1e-6f)
+                return true;
+        return false;
+    };
+
+    CHECK(still_at_original_position(fan.vertices[0])); // O: boundary
+    CHECK(still_at_original_position(fan.vertices[1])); // A: boundary
+    CHECK(still_at_original_position(fan.vertices[4])); // D: boundary
+    CHECK_FALSE(still_at_original_position(fan.vertices[2])); // B: interior, must have moved
+    CHECK_FALSE(still_at_original_position(fan.vertices[3])); // C: interior, must have moved
+}