I wanted to make sure that I’m not crazy or stupid by doing it this way. I’m building all my levels on Blender and, therefore, generating a box collision mesh or something wouldn’t work. So, I’m manually building a collision mesh inside Blender, on top of my level, that my custom exporter separates based on the prefix of the meshes inside Blender.
Kinda like this: https://www.katsbits.com/smforum/index.php?topic=837.0
But for the whole level. Is that the “right” way to do it?