Preserving Custom Collider Shapes When Exporting from Houdini to USD

[ArthurCG]

From Houdini, I can export a USD scene that includes a custom collider per mesh, as described in this post:

USD collision in 5.4

In 5.4 If you want to add collision you need to add the good schemas to your prim and then the token physics:approximation value and the physics:collisionEnabled boolean over "pCylinder380" ( prepend apiSchemas = ["PhysicsCollisionAPI", "PhysicsMeshCollisionAPI"] ) { uniform token physics:approximation = "boundingCube" bool physics:collisionEnabled = 1 approximations values are [image] If you want to use another mesh as your collision mesh…

However, these colliders are interpreted as kdop18 meshes and do not retain their original shape (which is convex in Houdini). I want to export a mesh that maintains its shape, similar to what we can do with UCX meshes. That workflow works well with FBX or Houdini Engine (using collision_geo_ucx_## groups).

Maybe I’m missing something with USD ?

[UE_FlavienP]

Did you put the

        uniform token purpose = "guide"
        uniform token physics:approximation = "none"

for each of the meshes that would be used for collision?

There will be a way to have same behaviour, with UCX_ prefix in 5.6 and USD import through Interchange.

[ArthurCG]

Yes every collider has these tokens.
Collision works and it takes the guide collider as expected. The only issue is the fact colliders shape get re-processed and don’t match exactly to their source.
Good to know it’s coming in 5.6, there’s no workaround currently with 5.5?