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kd-trees tutorial

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HI, currently my ray tracer does not support any spatial partitioning scheme, but i want to implement kd-tree. Do you know about some good tutorial I could read? Can I use bounding spheres or must I use bounding cubes? My idea is to have two trees: one, global, for the world and one for every single mesh. This way I can keep the primitives as general as possible. Wouòd it be a good idea? Thank you all.

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