This is the so-called “Twilight” renderer. Included are a the “standard ray tracer”, a path tracer, photon mapping, a bidirectional path tracer, and processors for radiosity as well as metropolis light transport. The raytracers can be used for both light modelling within your RGG model as well as for rendering your scene. The following introduction covers the raytracing settings when used for rendering. To use the Twilight renderer,

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