the magic of RiAttributes

Excluding a transmapped or refractive surface from GI is a surefire way to lower render time – often, spectacularly – but sometimes the look isn’t exactly what you want (especially if the HDRI is the only source of light in the scene – then it is the same as disabling shadows on that surface).

But – what no premade DS shaders have ever offered – if you limit diffuse bounces to 1 for that surface, the render time increase is minimal, but the shadowing is there.

Lalala.

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