@EvanHammel ← I did a quick search and I think you’re correct. I’m basically “keyholing”. I was also afraid you’d say to use a different modeler, because I really, REALLY don’t want to learn another application right now. I’ll look deeper into Unreal’s native modeler to see if it’s possible.
Hello, and of course!
Here you can see the default mesh (it is one pixel thick, so I can’t expand it to cover empty spaces):
Now here it is with the blocking mesh that I created by painstakingly tracing the shape of the original mesh’s negative space with the modeling tool (I used the sphere cutter on a basic cube shape):
And here they are together:
It’s like making a key for a keyhole… the hard way.