updates to bvh8i
bugfix in AVX2 opts for bvh8i intersector
updates to bvh8i intersectors
bugfix in bvh8i hybrid intersector code
perf updates to bvh8i intersectors
using 64 bit integers to sort index and distance on stack
Merge branch 'master' of https://github.com/embree/embree
replaced Accel3 by AccelN class
optimization in AccelN, exiting occluded loop if already found a hit
Merge branch 'master' into swoop
hair accel gets built
first simple ray/hair intersection working
first curved hair working
hair works even better