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ENH: Support CUDA ray cast projectors with parallel geometry#966

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axel-grc:ParallelGeometry
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ENH: Support CUDA ray cast projectors with parallel geometry#966
axel-grc wants to merge 1 commit into
RTKConsortium:mainfrom
axel-grc:ParallelGeometry

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Remove the parallel-geometry rejection from CUDA ray cast forward, warped forward, and back projectors. Add parallel ray construction using the geometry projection direction, and cover it in the CUDA ray-cast adjoint test.
Also align the source-position buffer type and size with the CUDA float3 layout, removing an unsafe double-pointer cast.

Close #929

Remove the parallel-geometry rejection from CUDA ray cast forward,
warped forward, and back projectors. Add parallel ray construction
using the geometry projection direction, and cover it in the CUDA
ray-cast adjoint test.
Also align the source-position buffer type and size with the CUDA
float3 layout, removing an unsafe double-pointer cast.
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Implement CudaRayCast for parallel geometries

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