有冇人試過寫shader或者ray tracer?

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有冇人有試過寫shader或者ray tracer?

SHADER: 例如　lafortune, bidirecitional Scattering surface Reflectance Distribution Function (BSSRDF and Participating media), 或主要同radiance 有關，唔系procedureral texture o個類shaders.

Raytracer or render engine: 同path Tracing , Bidirectional Path Tracing, ray marching, adaptive raytracing，hybird techniques (radiosity+ray tracing-based)有關.

有d野想請教