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feat: Add Z Anti-Aliasing (ZAA) contouring support

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Port Z Anti-Aliasing from BambuStudio-ZAA (https://github.com/adob/BambuStudio-ZAA)
to OrcaSlicer. ZAA eliminates stair-stepping on curved and sloped top surfaces
by raycasting each extrusion point against the original 3D mesh and micro-adjusting
Z height to follow the actual surface geometry.

Key changes:
- Add ContourZ.cpp raycasting algorithm (~330 lines)
- Extend geometry with 3D support (Point3, Line3, Polyline3, MultiPoint3)
- Template arc fitting for 2D/3D compatibility
- Change ExtrusionPath::polyline from Polyline to Polyline3
- Add 5 ZAA config options (zaa_enabled, zaa_min_z, etc.)
- Add posContouring pipeline step in PrintObject
- Update GCode writer for 3D coordinate output
- Add ZAA settings UI in Print Settings > Quality
- Add docs/ZAA.md with usage and implementation details

ZAA is opt-in and disabled by default. When disabled, the slicing pipeline
is unchanged.
This commit is contained in:
Matthias Nott
2026-02-09 20:38:46 +01:00
parent cae1567726
commit 963f8d86b7
57 changed files with 1817 additions and 204 deletions
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6
src/slic3r/GUI/LibVGCode/LibVGCodeWrapper.cpp
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@@ -303,7 +303,7 @@ static void convert_lines_to_vertices(const Slic3r::Lines& lines, const std::vec
static void convert_to_vertices(const Slic3r::ExtrusionPath& extrusion_path, float print_z, size_t layer_id, size_t extruder_id, size_t color_id,
EGCodeExtrusionRole extrusion_role, const Slic3r::Point& shift, std::vector<PathVertex>& vertices)
{
Slic3r::Polyline polyline = extrusion_path.polyline;
Slic3r::Polyline polyline = extrusion_path.polyline.to_polyline();
polyline.remove_duplicate_points();
polyline.translate(shift);
const Slic3r::Lines lines = polyline.lines();
@@ -319,7 +319,7 @@ static void convert_to_vertices(const Slic3r::ExtrusionMultiPath& extrusion_mult
std::vector<float> widths;
std::vector<float> heights;
for (const Slic3r::ExtrusionPath& extrusion_path : extrusion_multi_path.paths) {
Slic3r::Polyline polyline = extrusion_path.polyline;
Slic3r::Polyline polyline = extrusion_path.polyline.to_polyline();
polyline.remove_duplicate_points();
polyline.translate(shift);
const Slic3r::Lines lines_this = polyline.lines();
@@ -337,7 +337,7 @@ static void convert_to_vertices(const Slic3r::ExtrusionLoop& extrusion_loop, flo
std::vector<float> widths;
std::vector<float> heights;
for (const Slic3r::ExtrusionPath& extrusion_path : extrusion_loop.paths) {
Slic3r::Polyline polyline = extrusion_path.polyline;
Slic3r::Polyline polyline = extrusion_path.polyline.to_polyline();
polyline.remove_duplicate_points();
polyline.translate(shift);
const Slic3r::Lines lines_this = polyline.lines();