How did you come up with a ray trace friendly ggx model.
Real-time ray tracing in a browser. Changed out Ray Tracing in One Weekend materials system for PBR, less branching in shader. KdTree implementation has issues, trying BVH before releasing. #WebAssembly #WebGL @Peter_shirley #emscriptenpic.twitter.com/lZaS0aro8F
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The shader is using one half of split sum approx. for reflectance, then choosing randomly between specularity and diffusion based on reflectance to integrate. UE4’s analytic fitting for mobile saves having to calculate much. The other half is just throwing rays for blurriness.
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Thanks, I did something a bit ad hock trying to calculate a probability based on fresnel... but I didn’t have a strong mathematical basis for my choices.
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So cool!
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