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Indeed, and it's now one of several rendering methods in PRMan - newer one is RIS: http://renderman.pixar.com/resources/current/RenderMan/risOv...

Sidenote, you could have always done raytracing in PRMan, even with REYES. You just bring your own trace(). BMRT was often used as a trace() engine, until they came up with Entropy and Pixar sued them out of existence (NVidia bought them).




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