- update to version 3.8.0
  + New Features:
    * Added collision detection support for user geometries (see
      rtcCollide API function)
    * Passing geomID to user geometry callbacks.
  + Fixed Issues:
    * Bugfix in AVX512VL codepath for rtcIntersect1
    * For sphere geometries the intersection filter gets now
      invoked for front and back hit.
    * Fixed some bugs for quaternion motion blur.
    * RTCIntersectContext always non-const in Embree API
    * Made RTCHit aligned to 16 bytes in Embree API
- update to version 3.7.0
  + Added quaternion motion blur for correct interpolation of
    rotational transformations.
  + Fixed wrong bounding calculations when a motion blurred
    instance did instantiate a motion blurred scene.
  + In robust mode the depth test consistently uses tnear <= t <=
    tfar now in order to robustly continue traversal at a previous
    hit point in a way that guarentees reaching all hits, even hits
    at the same place.
  + Fixed depth test in robust mode to be precise at tnear and
    tfar.
  + Added next_hit tutorial to demonstrate robustly collecting all
    hits along a ray using multiple ray queries.
  + Implemented robust mode for curves. This has a small
    performance impact but fixes bounding problems with flat
    curves.
  + Improved quality of motion blur BVH by using linear bounds
    during binning.

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