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Vertex Culling illustration at SBR07
The document describes a new technique called vertex culling (VC) that can reduce the number of ray-triangle intersection tests when tracing rays through a scene. VC works by creating a frustum from the active rays in a packet and using it to cull triangles before testing intersections. This culling can eliminate over 90% of potential tests and allows building acceleration structures that are 10x smaller while maintaining or improving performance. The core of the VC algorithm precomputes values for culling each triangle's vertices against the frustum planes in an efficient single SIMD instruction per vertex.
