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KenM76andClaude Opus 5.5
c571b13469
Walk the PRC product tree into placed, coloured tessellations. - PrcFile::placements / placements_with(StyleAlpha, EntityOverrides): every drawable tessellation reached from the model file's roots, placed by its occurrence path's locations and then the representation item's local coordinate systems (a 4x4 Matrix) [WD 7.3.10.1, 7.6.3.2]. - Colours: styles and materials from the file structure globals, the father/son inheritance bits [WD 7.2.4.2], style transparency combined with material alpha by StyleAlpha, per-face styles and topology references via Placement::triangle_colours. A prototype's part is coloured by its own structure's styles. A colour index counts the colour array's doubles (pdf-issues #816). - Occurrences' entity references: colour, hide or relocate the entity they name, in the occurrence's subtree, everywhere, or not at all. - PrcFile::model_tree: the assembly tree as a model-tree panel lists it, with name sources, visibility and each node's placement range. - TriangleMesh::transformed applies a Matrix: positions, cofactor-mapped normals, winding flipped under a mirror. Never panics: occurrence and prototype cycles are Malformed; depth 64, 2^20 visits, MAX_PLACEMENTS and a face-override ceiling bound the walk; counts are checked against the remaining data before allocating. Markups, views, scene lights and clipping planes are Unsupported; textures are read past. Field orders the working draft leaves open follow prc-rs (MIT); each is marked `// prc-rs:`, as are the step-1 container, Double and schema choices that did. Adapted from pdfcer (MIT, same author), crates/pdfcer-3d/src/tree and vec3.rs at 0c9742b5936232af89cd707138ef149dc1f4a660. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SqmHYx8FiWM5PcsoiErgp9