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HanifKoh
390b7d8e6d
* Make Painted Multi-Material Slicing Deterministic Painted (multi-material) models sliced to slightly different G-code on every run: ±1 µm wall coordinates and reordered islands. Hashing each stage of the segmentation across runs showed the projected painted lines and the per-layer Voronoi segmentation were stable; the raw top/bottom projections from slice_mesh_slabs() were not. Three causes, all thread-order dependent: - slice_slabs_make_lines() appends each slab's intersection lines from a parallel facet loop and never restored a canonical order, so the loop start vertices and polygon order from make_slab_loops() depended on scheduling. Sort every slab's lines with the same key slice_make_lines() already uses. - segmentation_top_and_bottom_layers() wrote a layer's shell projections into neighbouring layers' vectors from the parallel loop, relying on a parity double-buffer that assumes TBB ranges are exactly one group wide and aligned, which blocked_range does not guarantee; two threads could append to the same vector. Each source layer now records its projections in its own slot and they are gathered per target layer in source order. - The painted-line sort in post_process_painted_lines() was not a total order: projections of one span from facets of different colours tied on every key and the first one won the span. Colour and end points now break the tie. Three multi-threaded runs of each painted fixture now give one G-code; unpainted output is unchanged. * Test That Slab Slicing Does Not Depend on the Thread Schedule Projects a dense, tilted sphere with slice_mesh_slabs() on one thread and then three times multi-threaded, and requires the polygons to match exactly, vertex order included. Fails without the canonical line sort, passes with it.
OrcaSlicer tests
Building, running and writing tests is documented on the wiki, under How to Test.
Two files here rather than there, because coding agents only read what is in the repository: