- update to version 3.12.0
  + Added linear cone curve geometry support. In this mode a real
    geometric surface for curves
  + with linear basis is rendered using capped cones. They are
    discontinuous at edge boundaries.
  + Enabled fast two level builder for instances when low quality
    build is requested.
  + Bugfix for BVH build when geometries got disabled.
  + Added EMBREE_BACKFACE_CULLING_CURVES cmake option. This allows
    for a cheaper round
  + linear curve intersection when correct internal tracking and
    back hits are not required.
  + The new cmake option defaults to OFF.
  + User geometries with invalid bounds with lower>upper in some
    dimension will be ignored.
  + Increased robustness for grid interpolation code and fixed
    returned out of range u/v
  + coordinates for grid primitive.
  + Fixed handling of motion blur time range for sphere, discs, and
    oriented disc geometries.
  + Fixed missing model data in releases.
  + Ensure compatibility to newer versions of oneTBB.
  + Motion blur BVH nodes no longer store NaN values.

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