u/caspervonb

Alright hello everyone, I made a standalone visual explanation of the Separating Axis Theorem for collision detection.

My first one so this, took an embarrassing amount of time but I feel like it has decent animations and narration at this point.

It covers:

• projecting convex shapes onto an axis
• finding candidate axes from edge normals
• testing interval overlap
• finding the minimum penetration depth and collision normal
• why SAT works for convex shapes
• what changes in 3D

The video is engine- and language-independent, and is aimed at people interested in implementing collision detection or understanding how narrow-phase algorithms work.

I’m also working on videos covering general collision detection, broad phase versus narrow phase, and GJK.