# SAT Collisions: Resolving rotations

Currently I have a working 2D SAT collision system with only boxes, but works with static rotations as well, leaving room for triangles. One of the issues I've been able to resolve was tunnelling, thanks to this thread's psuedocode that I got working for myself.

Problem is, this doesn't support moving rotations like a system using a minimum-translation-vector. If I rotate alongside the side of an object, the system will fail even if I'm not moving.

My first thought in solving this was to use the longest line you can draw in a square (that being the points on either side of a square) and comparing the length of that to whatever side on any axis, but even squares have different sizes on any given rotation projected onto an axis.

The system also doesn't work with multiple objects, because - while you can use the algorithm on a group of objects and find the shortest distance out of all of them - if I conserve my velocity relative to the colliding axis, diving into the crest of 2 objects means I will phase through one of them not beyond a 45 degree angle.

Is there an effective way to resolve collisions on rotations and groups of objects, while using this anti-tunnelling algorithm? I don't care if it's expensive, I'll take whatever you can think of.