• Improved performance for streams of coherent (single) rays flagged
  with RTC_INTERSECT_COHERENT. For such coherent ray streams, e.g.
  primary rays, the performance typically improves by 1.3–2×.
• New spatial split BVH builder for triangles, which is 2–6× faster
  than the previous version and more memory conservative.
• Improved performance and scalability of all standard BVH builders on
  systems with large core counts.
• Fixed rtcGetBounds for motion blur scenes.
• Thread affinity is now on by default when running on the latest
  Intel® Xeon Phi™ processor.
• Added initial AVX512 support for future Intel® Xeon processors.