feat: colored PCB assembly — STEP materials preserved (11 colors)
- Scene GLB export preserves per-geometry materials from STEP files
- 158 sub-meshes with individual colors:
- Green PCB substrate (20,51,36)
- Orange copper traces (226,138,7)
- Silver pads/solder (165,163,146)
- Black IC bodies (5,5,5)
- Yellow silkscreen (198,196,160)
- 397K vertices, 334K faces, 2.5MB (was 8.4MB gray)
- Board thickness visible (12.1mm Z-depth)
- BMU board + 4x switch MOSFET properly assembled
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Clément SAILLANT
4d7a2580af
