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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 20:42:26 +01:00
parent cae1567726
commit 963f8d86b7
57 changed files with 1817 additions and 204 deletions
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src/libslic3r/ClipperUtils.hpp
+3
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@@ -334,6 +334,7 @@ Slic3r::Polygons offset(const Slic3r::Polygon &polygon, const float delta, Clipp
// Wherever applicable, please use the expand() / shrink() variants instead, they convey their purpose better.
// Input polygons for negative offset shall be "normalized": There must be no overlap / intersections between the input polygons.
Slic3r::Polygons offset(const Slic3r::Polyline &polyline, const float delta, ClipperLib::JoinType joinType = DefaultLineJoinType, double miterLimit = DefaultLineMiterLimit, ClipperLib::EndType end_type = DefaultEndType);
Slic3r::Polygons offset(const Slic3r::Polyline3 &polyline, const float delta, ClipperLib::JoinType joinType = DefaultLineJoinType, double miterLimit = DefaultLineMiterLimit, ClipperLib::EndType end_type = DefaultEndType);
Slic3r::Polygons offset(const Slic3r::Polylines &polylines, const float delta, ClipperLib::JoinType joinType = DefaultLineJoinType, double miterLimit = DefaultLineMiterLimit, ClipperLib::EndType end_type = DefaultEndType);
Slic3r::Polygons offset(const Slic3r::Polygons &polygons, const float delta, ClipperLib::JoinType joinType = DefaultJoinType, double miterLimit = DefaultMiterLimit);
Slic3r::Polygons offset(const Slic3r::ExPolygon &expolygon, const float delta, ClipperLib::JoinType joinType = DefaultJoinType, double miterLimit = DefaultMiterLimit);
@@ -524,6 +525,8 @@ Slic3r::Polylines intersection_pl(const Slic3r::Polyline &subject, const Slic3r
Slic3r::Polylines intersection_pl(const Slic3r::Polylines &subject, const Slic3r::Polygons &clip);
Slic3r::Polylines intersection_pl(const Slic3r::Polylines &subject, const Slic3r::ExPolygons &clip);
Slic3r::Polylines intersection_pl(const Slic3r::Polygons &subject, const Slic3r::Polygons &clip);
Slic3r::Polylines3 intersection_pl(const Slic3r::Polylines3 &subject, const Slic3r::Polygon &clip);
Slic3r::Polylines3 intersection_pl(const Slic3r::Polylines3 &subject, const Slic3r::ExPolygon &clip);
inline Slic3r::Lines intersection_ln(const Slic3r::Lines &subject, const Slic3r::Polygons &clip)
{