Default capsule collider bug

Aurimas_Kirelis · June 18, 2024, 10:04am

If you have default capsule colider and reduce in size to make it more flat, it starts behaving incorrectly.

https://playcanvas.com/project/1229326/overview/default-collider-bug
This is example project. Capsule height is set to 0.16, and on editor it looks correct. But if you start game you will notice that actuall collider height is incorrect.
Editor look;

what happens in game:

Cylinder colider works correctly (left of the image). Character controller can fly while pressing E, when you press Q it will stop flying. So you can easily test the weird collider behavior.

I dont think it is a big problem, but bug is a bug and it don’t seem to be another thread about it.

LeXXik · June 18, 2024, 10:10am

The Editor shape allows to deform the capsule the way that a physics engine cannot do. The height of your capsule cannot be less than its 2 radiuses. If your height is zero, then it will become a sphere.

Albertos · June 18, 2024, 2:52pm

github.com/playcanvas/editor

Radius of capsule collision gives unexpected result

opened 09:09PM - 02 Jan 22 UTC

albertvanveen

bug area: physics

### Description When the radius of a capsule collision is higher than half the …height, the capsule collision no longer works as expected. I already spoke to Steven about it and he explained why the result is expected. However, as it is unexpected for a regular user, a warning or limitation in the editor would be desirable. ### Example In the example below, both entities have a dynamic rigidbody, the left entity works as expected, but the right entity gives a unexpected result because the radius is apparently to high, so that the height of the collision is no longer correct. ![image](https://user-images.githubusercontent.com/52896137/147889127-8485b9dc-0895-4294-8b59-ca0f2e93b017.png) ![image](https://user-images.githubusercontent.com/52896137/147889461-781b068f-e4aa-49db-95b8-243e90aa5a76.png)