Performance | _UCX collider meshes VS Unreal collision primitives

Development World Creation
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1

Hey, some of my assets need to have their colliders generated in Blender (I’m creating them semi-procedurally with python).
I need capsule colliders. If I’ll create an UCX capsule collider (e.g. like this), will it be much worse for performance than the built-in Capsule collision primitive in UE?

Both the colliders would be capsules, but I’m afraid that the UCX collider will be calculated per-poly (?) while the UE capsule primitive calculates radius + height or something else that is better for performance… Am I right?
I hope that the difference is not that big, I’d make UCX capsule meshes as much low-poly as I can…

… Anyone has an idea how these colliders are calculated?

2

Generally, you are correct, and UCX primitive shaped as capsule will be heavier than capsule collision primitive.

3

Hmm maybe I’ll be able to use boxes instead of capsules then - I suspect that in case of UCX collider meshes, the less polys, the better :slight_smile:

4

Update for others that might have a similar concern:
Besides UCX, we can also use **UBX **and **USP **prefixes. When created correctly, e.g. the UBX will be imported as a simple box collision promitive, not a mesh, so it should be better. Here you can read more about this:
https://docs.unrealengine.com/latest/INT/Engine/Content/FBX/StaticMeshes/index.html#collision