I mean, as a good point, ray tracing still isn't fast enough for the vast majority of pre-computed rendering for motion pictures. See PRMan and the majority of

I mean, as a good point, ray tracing still isn't fast enough for the vast majority of pre-computed rendering for motion pictures. See PRMan and the majority of other modern renderers that all use still use the REYES algorithm. Sure, a unbiased renderer is great when you just need a single still without a huge amount of tweaking, but when you need motion ray tracing -everything- will remain impractically slow for a very long time.