An Intersection Test for Arbitrary Rectangular Prisms

1 min. read Submitted 07/12/2017 Last Edited 19/02/2021 #unity #programming

Have you ever had two arbitrarily rotated and sized rectangular prisms, and wanted to check if they’re intersecting? I know I have! Just an old AABB won’t do the trick, as very snug fitting rectangular prisms need to be detected and dismissed. There are some dastardly configurations (for instance, imagine a very very small rectangular prism sitting just above the surface of a massive and highly skewed rectangular prism) which also need to be sussed out.

It turned out to be a surprisingly tricky problem, and I had to pull a lot of different things from a lot different places together to get it working.

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