>>267739716
Sorry, should have been more specific
How do I get started in troubleshooting a collider?
I'm not sure, but I suspect the issue is that I created my geometry by hollowing out a cube and solidifying it. So now the the 'entryway' I cleared out is still blocking and I can't actually go inside.
How do you see/modify the mesh that unity's using?

>>267739376
I'm fairly new to both, so this is very much a "how to get started" question.