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Editorial Team
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Asked: 2026-05-28T15:31:41+00:00

XNA contains a BoundingFrustum class which defines a frustum and facilitates collisions with Rays

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XNA contains a BoundingFrustum class which defines a frustum and facilitates collisions with Rays and other objects. However, the Frustum can only be constructed with a Matrix. I have a certain object which is created in a frustum shape using 8 vertices; what kind of Matrix should I create from these vertices in order to create a Frustum to represent it?

The object in question is a chunk of a sphere– 4 points on the sphere’s surface in the form of a square, extending downward into the origin of the sphere.

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1 Answer

  1. Editorial Team

    Thanks to Nic’s inspiration and the help of a friend, I was able to write this class which represents a region defined by 8 points which has flat sides, such as a frustum or cube.

    Here is the class.

    It’s important to note that, when passing in the constructor parameters, you choose a vantage point from which to view your region and stick with it.

    Hope this helps anyone else who may run into this (obscure) problem to solve.

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