paniq/ellipsoid_frustum.md

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Ellipsoid Frustum Intersection

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ellipsoid_frustum.md

Yesterday I posted a problem to math stack exchange that bothers me for a while now, and right after I've had a few exchanges on Twitter that inspired me to attempt a solution.

The basic challenge is this: we want to solve for a pixel or tile on screen

Whether an ellipsoid arbitrarily parametrized in world space is overlapping this pixel
What the near and far depth range of the overlapping portion is (important for culling, but also ray-space CSG)

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