Octree Raycasting with Stagbeetle Dataset

Casting a ray through an octree and keeping track of all intersected nodes. Additionally the exact intersection points between adjacent cells are registered.
This will be integrated into a Volume Renderer to accelerate Raycasting by skipping empty cells within the volume that do not contain any meaningful data.

The Beetle dataset is taken from TU Wien and has a resolution of 832x832x494 at 8 bit.

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