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2.4

- Support for Catmull Clark subdivision surfaces (triangle/quad base
primitives)
- Support for vector displacements on Catmull Clark subdivision
surfaces
- Various bug fixes (e.g. 4-byte alignment of vertex buffers works)

2.3.3

- BVH builders more robustly handle invalid input data (Intel Xeon
processor family)
- Motion blur support for hair geometry (Xeon)
- Improved motion blur performance for triangle geometry (Xeon)
- Improved robust ray tracing mode (Xeon)
- Added `rtcCommitThread` API call for easier integration into
existing tasking systems (Xeon and Intel Xeon Phi coprocessor)
- Added support for recording and replaying all
`rtcIntersect`/`rtcOccluded` calls (Xeon and Xeon Phi)

2.3.2

- Improved mixed AABB/OBB-BVH for hair geometry (Xeon Phi)
- Reduced amount of pre-allocated memory for BVH builders (Xeon Phi)
- New 64-bit Morton code-based BVH builder (Xeon Phi)
- (Enhanced) Morton code-based BVH builders use now tree rotations to
improve BVH quality (Xeon Phi)
- Bug fixes (Xeon and Xeon Phi)

2.3.1

- High quality BVH mode improves spatial splits which result in up to
30% performance improvement for some scenes (Xeon)
- Compile time enabled intersection filter functions do not reduce
performance if no intersection filter is used in the scene (Xeon and
Xeon Phi)
- Improved ray tracing performance for hair geometry by \>20% on Xeon
Phi. BVH for hair geometry requires 20% less memory
- BVH8 for AVX/AVX2 targets improves performance for single ray
tracing on Haswell by up to 12% and by up to 5% for hybrid (Xeon)
- Memory conservative BVH for Xeon Phi now uses BVH node quantization
to lower memory footprint (requires half the memory footprint of the
default BVH)

2.3

- Support for ray tracing hair geometry (Xeon and Xeon Phi)
- Catching errors through error callback function
- Faster hybrid traversal (Xeon and Xeon Phi)
- New memory conservative BVH for Xeon Phi
- Faster Morton code-based builder on Xeon
- Faster binned-SAH builder on Xeon Phi
- Lots of code cleanups/simplifications/improvements (Xeon and Xeon
Phi)

2.2

- Support for motion blur on Xeon Phi
- Support for intersection filter callback functions
- Support for buffer sharing with the application
- Lots of AVX2 optimizations, e.g. \~20% faster 8-wide hybrid
traversal
- Experimental support for 8-wide (AVX/AVX2) and 16-wide BVHs (Xeon
Phi)

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