I do not use PCG but if you need simple collision you can open your mesh in the static mesh editor and either:
- go in the collision options and generate a simple collision for your mesh
- use the actual complex collision mesh as simple, as mentionned by @josgarno, (you can do that on several meshes at once using the property matrix After bringing Rhino to the Unreal Engine(end key) - #6 by UE_FlavienP)
