Enable extent_adaptive_clamping for gaussian splats - #34
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WeiPhil
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Sep 16, 2026
WeiPhil
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- Enable extent_adaptive_clamping = true on Mitsuba ellipsoidsmesh plugins in both C++ Hydra (PrimTranslator::BuildParticleField) and Python offline translator (usd_mitsuba.gaussian_splatting) for 1.5x-1.7x faster 3DGS rendering.
- Clamp splat opacities to >= 0.0101 (via LoadOpacities in C++ and np.maximum in Python) to prevent 0 or NaN proxy shell extents when opacity <= 0.01.
- Split ParticleFieldSpec::attributes_dirty into opacities_dirty and sh_dirty so in-place opacity updates include 'data' in parameters_changed (triggering EllipsoidsMesh::recompute_mesh()), while pure SH updates avoid proxy mesh and BVH recomputation.
- Add unit and fuzzing tests verifying opacity clamping and in-place adaptive proxy shell updates.
- Enable extent_adaptive_clamping = true on Mitsuba ellipsoidsmesh plugins in both C++ Hydra (PrimTranslator::BuildParticleField) and Python offline translator (usd_mitsuba.gaussian_splatting) for 1.5x-1.7x faster 3DGS rendering. - Clamp splat opacities to >= 0.0101 (via LoadOpacities in C++ and np.maximum in Python) to prevent 0 or NaN proxy shell extents when opacity <= 0.01. - Split ParticleFieldSpec::attributes_dirty into opacities_dirty and sh_dirty so in-place opacity updates include 'data' in parameters_changed (triggering EllipsoidsMesh::recompute_mesh()), while pure SH updates avoid proxy mesh and BVH recomputation. - Add unit and fuzzing tests verifying opacity clamping and in-place adaptive proxy shell updates.
dvicini
approved these changes
Sep 16, 2026
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