Photorealistic Voxel Rendering on GPUs

Basic Ray Tracing Voxel Engines: Spherical Voxel Cone Visibility

OpenGL should implement camera 360 ray rendering, when hardware
has already pre-calculated scene sphere voxels x2 visibility matrix.
step 1: x2 distance matrix
step 2: intersection occlusion
step 3: camera ray material multi ray bounce tracing

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