- embree integration
- remove polymesh intersection refinement
- remove geometry instancing
- remove compressed normals
- remove path differentials
- remove uv interpolation
- remove polymesh face orientation
- remove ray type filtering
- remove shadow object links
- triangle soup
- remove volume object intersection
- remove camera clipping planes
- remove path caching
- remove sky importance sampling
原文：http://www.cnblogs.com/len3d/p/4182093.html