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Notes:
hybridVolume works using the pixel-to-volume lookup table for a camera designated as the dominant camera.
For each pixel in the dominant camera, we have a list of voxels.
For each silhouette pixel, we push it’s list of voxels onto a stack
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Then for each voxel on the stack we examine its projection onto the remaining cameras.
If they all correspond to silhouette pixels, then we mark that voxel as filled.
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This dominant camera projection has the effect of sampling a smaller space of the volume for full examination.