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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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8
src/slic3r/GUI/Tab.cpp
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@@ -2322,6 +2322,14 @@ void TabPrint::build()
optgroup->append_single_option_line("ironing_angle", "quality_settings_ironing#angle-offset");
optgroup->append_single_option_line("ironing_angle_fixed", "quality_settings_ironing#fixed-angle");
optgroup = page->new_optgroup("Z Contouring", L"param_advanced");
optgroup->append_single_option_line("zaa_enabled");
optgroup->append_single_option_line("zaa_region_disable");
optgroup->append_single_option_line("zaa_minimize_perimeter_height");
optgroup->append_single_option_line("zaa_dont_alternate_fill_direction");
optgroup->append_single_option_line("zaa_min_z");
optgroup->append_single_option_line("ironing_expansion");
optgroup = page->new_optgroup(L("Wall generator"), L"param_wall_generator");
optgroup->append_single_option_line("wall_generator", "quality_settings_wall_generator");
optgroup->append_single_option_line("wall_transition_angle", "quality_settings_wall_generator#arachne");