[Bf-cycles] raPT, highly efficient BVH kernels

[Mohamed Sakr]

Hi,

found this thread, http://ompf2.com/viewtopic.php?f=3&t=2098&p=5507
it states that it outperforms embree, + the margin between both goes
farther with more threads!
it is also vectorized (AVX), so this can be implemented in CUDA too I guess
with a huge boost in performance.

@Sergey and @Brecht, what do you think?

cheers,
Mohamed Sakr
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