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From Odwiki

This setting affects RayTracing in mantra. Mantra will combat aliasing in reflections by sending rays from the interior on MicroPolygon patches. It sends as many rays from the interior as what is set in the SuperSampling settings in the MantraROP. If you want to send more rays (in the case of high-frequency environments which may twinkle in reflections) or fewer rays (for example if you are in a low-frequency environment and you wish to save the time on the raytracing) you can specify the ray-tracing sampling by de-coupling the sampling in the MantraROP.