GameMaker Studio new Collision Detection issues

The new 2022.1 GameMaker Studio version introduced a new Collision Detection system. It fixes some issues while breaking lots of things that were working just fine with the previous one.

The old system used exclusive and rounded coordinates for bounding boxes. For example, the bounding box for a 16×16 collision mask would be generated from (0, 0) to (15, 15) (relative to the mask).

The new system is now inclusive and not rounded. For example the above said bounding box would now be (0, 0) to (16, 16) – they now include the bottom-most and right-most edges.

You might have to adjust your collision bounding box if you don’t want to be stuck in walls. Keep in mind that you might have to change every single collision mask in your game, depending on your project structure. Not only the player collision mask. You might also have to rework the collision code (something I do not intend to do).

Or you could enable the Compatibility Mode and use the old collision detection system.

I hope this solves your issues.