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By default, V-Ray uses the Intel Embree raycaster. For more information, see the official Intel Embree site.
G-Buffer
This term describes the collection of various data generated during image rendering. These could be Z-values, material IDs, object IDs, non-clamped colors, etc. This has proven to be very useful for performing post-rendering image processing. (See also: G-Buffer Anti-aliasing, Image Sampler)
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