Add OptiX sphere primitive bindings#1
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Adds Python bindings for OptiX sphere primitives, enabling hardware- accelerated ray-sphere intersection for point cloud rendering: - BuildInputSphereArray struct and Python class binding - BUILD_INPUT_TYPE_SPHERES enum value - PRIMITIVE_TYPE_SPHERE and PRIMITIVE_TYPE_FLAGS_SPHERE enums - Sphere case in convertBuildInputs() for GAS construction - Gated behind OPTIX_VERSION >= 70600
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Summary
OptixBuildInputSphereArray, enabling hardware-accelerated ray-sphere intersectionBuildInputSphereArrayclass with full property access (vertex buffers, radius buffers, flags, SBT records)PRIMITIVE_TYPE_SPHEREandPRIMITIVE_TYPE_FLAGS_SPHEREenum values for pipeline configurationBUILD_INPUT_TYPE_SPHERESfor GAS build input type selectionconvertBuildInputs()for automatic GAS constructionOPTIX_VERSION >= 70600Motivation
Sphere primitives provide efficient point cloud rendering — each point becomes a hardware-intersected sphere, avoiding the need to tessellate splats into triangles. This is used by rtxpy for lidar point cloud visualization (see makepath/rtxpy#58).
Test plan
optixGetPrimitiveIndex()place_pointcloud()pipeline