Hi…
Im importing a bunch of tunnel sections. Auto collision using complex collision doesnt seem to work and copying the mesh and making it in to a UCX doesnt work either becoz its concaved…
Any ideas ?
You will need to create your own collision meshes for that.
Check this tutorial out, I think this is what you are looking for:
Cheers Evil_FischiThanks for the link. Yeh Ive seen that video and have been using it.
And actually, that was the main reason for this question…
I would have thought that something would have been added to unreal to better deal with this type of thing.
I guess I will have to do a bit more work 
Thanks again for the reply.
I think especially hollow objects are really hard to compute with an algorithm, so there will be no way around.