The mapbox earcut library returns triangles in clockwise winding order,
but USD expects counter-clockwise order. This was causing reversed face
orientation for polygons with 5 or more vertices when using the earcut
triangulation method.
Changes:
- src/tydra/render-data.cc: Reverse triangle winding order by swapping
indices 1 and 2 when processing earcut results to convert from CW to CCW
- examples/tydra_to_renderscene/to-renderscene-main.cc: Add --trifan
option to enable triangle fan triangulation method for testing
The triangle fan method was already producing correct CCW triangles and
did not require changes.
Tested with models/ngon.usdc containing pentagon, hexagon, and octagon.
Both triangulation methods now correctly produce CCW triangles.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
- New generate_envmaps.sh script to regenerate all 7 environment maps
- Includes exact parameters for each preset (sun/sky/studio variations)
- Automated Node.js version checking and HDRGen tool validation
- Optional PNG preview generation with tone mapping
- Updated ENVMAPS_README.md with reproduction instructions
Usage: bash models/textures/generate_envmaps.sh
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Created comprehensive test suite for OpenPBR materials demonstrating various
material properties and texture mapping workflows. All scenes use proper USD
shader node IDs (OpenPBRSurface, UsdUVTexture, UsdPrimvarReader_float2) rather
than MaterialX node definition IDs.
New test files:
- openpbr-brick-sphere.usda: Diffuse material with brick texture
- openpbr-metallic-cube.usda: Metallic material with checkerboard
- openpbr-emissive-plane.usda: Emissive with cat texture (Mesh - MaterialX exportable)
- openpbr-glass-sphere.usda: Glass/transmission material
- openpbr-subsurface-sphere.usda: Subsurface scattering with texture
- openpbr-coated-cube.usda: Clear coat over brick texture
- openpbr-multi-object.usda: Multi-material scene (4 objects, 4 materials)
Texture asset:
- textures/brick.bmp: 64x64 red brick pattern with gray mortar
- create_brick_texture.py: Python script to generate brick texture
Documentation:
- OPENPBR_TESTS_README.md: Comprehensive guide covering material structure,
shader node IDs, Tydra conversion limitations, and testing procedures
Material features demonstrated:
- Base layer (color, metalness, roughness)
- Specular (weight, roughness, IOR)
- Transmission (weight, color, thin_walled)
- Emission (color, luminance)
- Subsurface scattering (color, weight, radius, radius_scale)
- Coat (weight, roughness, IOR, color)
- Texture mapping with UV coordinates
- Multiple texture formats (BMP, PNG, JPG)
Note: Materials bound to parametric primitives (Sphere, Cube) are not
currently converted by Tydra RenderScene. Use explicit Mesh primitives
for MaterialX export compatibility.
Tested: All files parse correctly, emissive-plane exports to MaterialX XML/JSON
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
