3d

How do I reverse-project 2D points into 3D?

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[*] Alright, I came here looking for an answer and didn’t find something simple and straightforward, so I went ahead and did the dumb but effective (and relatively simple) thing: Monte Carlo optimisation. Very simply put, the algorithm is as follows: Randomly perturb your projection matrix until it projects your known 3D coordinates to your … Read more

When to use Binary Space Partitioning, Quadtree, Octree?

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There is no clear answer to your question. It depends entirely how your data is organized. Something to keep in mind: Quadtrees work best for data that is mostly two dimensional like map-rendering in navigation systems. In this case it’s faster than octrees because it adapts better to the geometry and keeps the node-structures small. … Read more

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