Question Non-convex Physics Slow Down

Hi, I am experimenting with non-convex mesh collider physics. For some reason, the game slows down a lot when it gets to the concave parts... I guess Unity has to do a lot more calculations... How to fix this? I am trying to avoid making a bunch of smaller colliders. Thanks

 

Don't avoid making a bunch of simple colliders. The system is highly optimized for them.

 

Ah, I am actually trying to load a 3D model in real time, so wouldn't be possible to make new colliders in real time

 

Hmmm interesting, I actually tried multiple angles, it always slow down when it gets to those concave edges, like stairs roo

 

There should be no difference for these edges, since a concave mesh collider is usually just a bunch of triangles sitting in a spatial partitioning structure (possibly a tree of some kind, like a kd-tree or a BVH). Concave regions are treated no different from convex ones.

Make sure your geometry doesn't do anything weird near these edges, like many small sliver triangles or a ton of overlapping edges or other non-manifold-like formations.