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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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13
src/libslic3r/GCode.hpp
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@@ -221,7 +221,7 @@ public:
const Vec2d& origin() const { return m_origin; }
void set_origin(const Vec2d &pointf);
void set_origin(const coordf_t x, const coordf_t y) { this->set_origin(Vec2d(x, y)); }
const Point& last_pos() const { return m_last_pos; }
Point last_pos() const { return m_last_pos.to_point(); }
Vec2d point_to_gcode(const Point &point) const;
Point gcode_to_point(const Vec2d &point) const;
Vec2d point_to_gcode_quantized(const Point& point) const;
@@ -381,7 +381,8 @@ private:
void check_placeholder_parser_failed();
size_t get_extruder_id(unsigned int filament_id) const;
void set_last_pos(const Point &pos) { m_last_pos = pos; m_last_pos_defined = true; }
void set_last_pos(const Point &pos) { m_last_pos = Point3(pos, 0); m_last_pos_defined = true; }
void set_last_pos(const Point3 &pos) { m_last_pos = pos; m_last_pos_defined = true; }
bool last_pos_defined() const { return m_last_pos_defined; }
void set_extruders(const std::vector<unsigned int> &extruder_ids);
std::string preamble();
@@ -392,9 +393,9 @@ private:
std::string extrude_entity(const ExtrusionEntity &entity, std::string description = "", double speed = -1., const ExtrusionEntitiesPtr& region_perimeters = ExtrusionEntitiesPtr());
// Orca: pass the complete collection of region perimeters to the extrude loop to check whether the wipe before external loop
// should be executed
std::string extrude_loop(ExtrusionLoop loop, std::string description, double speed = -1., const ExtrusionEntitiesPtr& region_perimeters = ExtrusionEntitiesPtr(), const Point* start_point = nullptr);
std::string extrude_multi_path(ExtrusionMultiPath multipath, std::string description = "", double speed = -1.);
std::string extrude_path(ExtrusionPath path, std::string description = "", double speed = -1.);
std::string extrude_loop(const ExtrusionLoop &loop, std::string description, double speed = -1., const ExtrusionEntitiesPtr& region_perimeters = ExtrusionEntitiesPtr(), const Point* start_point = nullptr);
std::string extrude_multi_path(const ExtrusionMultiPath &multipath, std::string description = "", double speed = -1.);
std::string extrude_path(const ExtrusionPath &path, std::string description = "", double speed = -1.);
// Orca: Adaptive PA variables
// Used for adaptive PA when extruding paths with multiple, varying flow segments.
@@ -582,7 +583,7 @@ private:
std::map<std::string, std::vector<std::string>> m_placeholder_error_messages;
#endif
Point m_last_pos;
Point3 m_last_pos;
bool m_last_pos_defined;
std::unique_ptr<CoolingBuffer> m_cooling_buffer;