Embree v3.6.1 Release

• Restored binary compatibility between Embree 3.6 and 3.5 when single-level instancing is used.
• Fixed bug in subgrid intersector.
• Removed point query alignment in ISPC header.

Embree v3.6.0 Release

• Added Catmull-Rom curve types.
• Added support for multi-level instancing.
• Added support for point queries.
• Fixed a bug preventing normal oriented curves being used unless timesteps were specified.
• Fixed bug in external BVH builder when configured for dynamic build.
• Added support for new config flag "user_threads=N" to device initialization
  which sets the number of threads used by TBB but created by the user.
• Fixed automatic vertex buffer padding when using rtcSetNewGeometry API function.

Embree v3.6.0-beta.0 Release

• Added Catmull-Rom curve types.
• Added support for multi-level instancing.
• Added support for point queries.
• Fixed a bug preventing normal oriented curves being used unless timesteps were
  specified.
• Fixed bug in external BVH builder when configured for dynamic build.
• Added support for new config flag "user_threads=N" to device initialization
  which sets the number of threads used by TBB but created by the user.
• Fixed automatic vertex buffer padding when using rtcSetNewGeometry API function.

Embree v3.5.2

• Added EMBREE_ISA_NAMESPACE cmake option that allows to put all Embree API functions
  inside a user defined namespace.
• Added EMBREE_LIBRARY_NAME cmake option that allows to rename the Embree library.
• When Embree is compiled as static library, EMBREE_STATIC_LIB has no longer to get
  defined before including the Embree API headers.
• Added CPU frequency_level device configuration to allow an application to specify the
  frequency level it wants to run on. This forces Embree to not use optimizations that
  may reduce the CPU frequency below that level. By default Embree is configured to the
  the AVX-heavy frequency level, thus if the application uses solely non-AVX code, configuring
  the Embree device with "frequency_level=simd128" may give better performance.
• Fixed a bug in the spatial split builder which caused it to fail
  for scenes with more than 2^24 geometries.

Embree v3.5.1

• Fixed ray/sphere intersector to work also for non-normalized rays.
• Fixed self intersection avoidance for ray oriented discs when non-normalized rays were used.
• Increased maximal face valence for subdiv patch to 64 and reduced stack size requirement for subdiv patch evaluation.

Embree v2.17.7

• Fixed frequency issue for Skylake server CPUs.

Embree v3.5.0

• Changed normal oriented curve definition to fix waving artefacts.
• Fixed bounding issue for normal oriented motion blurred curves.
• Fixed performance issue with motion blurred point geometry.
• Fixed generation of documentation with new pandoc versions.

Embree v3.4.0

• Added point primitives (spheres, ray-oriented discs, normal-oriented discs).
• Fixed crash triggered by scenes with only invalid primitives.
• Improved robustness of quad/grid-based intersectors.
• Upgraded to TBB 2019.2 for release builds.

Embree v3.3.0

• Added support for motion blur time range per geometry. This way geometries can appear and disappear during the camera shutter and time steps do not have to start and end at camera shutter interval boundaries.
• Fixed crash with pathtracer when using --triangle-sphere command line.
• Fixed crash with pathtracer when using --shader ao command line.
• Fixed tutorials showing a black window on macOS 10.14 until moved.

Embree v2.17.6

• Fixed compile issues with ICC 2019