Zoltán Erdőkövy

Changing the group names from "collision_geo_simple_ucx0", "collision_geo_simple_ucx1" and so on to "collision_geo_simple_0", "collision_geo_simple_1, etc didn't help.

Is there an example HDA that demonstrably produces proper collisions? A 100% certified reference would help a lot.

So an HDA gets the mesh data from Unreal 5.3, including collision. In Houdini 20 I separate the collision prims from the rest, process the rest then merge the collision prims back before the output node. When the mesh arrives back to Unreal it does have colliders but they are a bunch of unrecognizable triangles stretched to infinity.

As a debug step I instantly passed the input data to the output and the result is the same. The incoming mesh has proper UCX collisions.

Great, thank you! I'll dig in.