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Note that this is turned off by default and must be enabled at build time with the CMake WITH_CYCLES_EMBREE flag. Embree must be built as a static library with ray masking turned on, the `make deps` scripts have been updated accordingly. There, Embree is off by default too and must be enabled with the WITH_EMBREE flag. Using Embree allows for much faster rendering of deformation motion blur while reducing the memory footprint. TODO: GPU implementation, deduplication of data, leveraging more of Embrees features (e.g. tessellation cache). Differential Revision: https://developer.blender.org/D3682