Shader Performance Improvement Options

[gkjohnson]

• Require that a BVH have at most 1 triangle per bound which removes an internal for loop
  • Fix build logic so the BVH is arbitrarily split into individual triangles until the leaves if no split is found.
• Improved triangle intersect functions
• Improve bounds intersect functions
• Improved bounds traversal logic
• #346
• #332
  • https://www.nvidia.com/docs/IO/76976/HPG2009-Trace-Efficiency.pdf
  • https://research.nvidia.com/publication/2017-07_Efficient-Incoherent-Ray

Other

• ~Unpack vertex buffers so no index buffer sample is needed?~
  • too complicated, hopefully unnecessary

[gkjohnson]

"QBVH" seems to be a popular choice for GPU-based path tracers.

• https://hb3p8.github.io/papers/QBVH_gtc_2016.pdf
• https://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.100/institut/Papers/QBVH.pdf