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and length; this reduces a bit of arithmetic when traversing the bounding volume hierarchy and makes the code in Geometry.build() more concise. add an untested cuda kernel to interleave the bits in three uint64 arrays.
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to integers in alpha blending until the last step.
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tracer and photon simulation can be run in the same context. added the ability to add alpha channel to triangle color so that triangles can be made transparent. added __noinline__ modifier to certain device functions to speed up kernel compilation.
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