SOPGI for Houdini | Tool of the Day

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SOPGI for Houdini | Tool of the Day
Developed by Alessandro Nardini - SOPGI is a small raytracer build on top of BRDF shading models with photon mapping global illumination for SideFX Houdini and run in SOP at point level.
SOPGI feature recursive reflections and refractions and it implement a full tree of rays splitting as illustraded in this picture:
scratchapixel.com/images/upload/ray-tracing-refresher/rt-recursive.png
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