Syoyo Fujita 9798cf142c Add Blender v4.5 MaterialX OpenPBR shader support ...

Implement support for ND_open_pbr_surface_surfaceshader exported by Blender v4.5
when using MaterialX. This enables proper parsing and conversion of OpenPBR
materials from Blender-exported USD files.

Key changes:
- Add MtlxOpenPBRSurface struct with all Blender v4.5 parameters in usdMtlx.hh
- Implement ReconstructShader specialization for MtlxOpenPBRSurface in prim-reconstruct.cc
- Add MaterialXConfigAPI detection and OpenPBR shader attachment in render-data.cc
- Implement DumpOpenPBRSurface for material output in render-scene-dump.cc
- Add pretty-print support for MtlxOpenPBRSurface in pprinter.cc

When MaterialXConfigAPI is present on a Material, the system now:
1. Attempts to parse outputs:mtlx:surface connection
2. Falls back to searching for child Shader prims with OpenPBR info:id
3. Converts MtlxOpenPBRSurface to OpenPBRSurface for rendering

Tested with models/cube-materialx.usda and models/suzanne-materialx.usda

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-05 10:43:04 +09:00

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