Right now, there are a couple main issues with rendering:

• various faces aren't oriented the right way (easy to fix)
• lighting does not correctly apply to slopes (harder to fix)

I'm working on the orientation issue, but will probably need help with the lighting one, since I don't really know what I'm doing GL-wise.

Examples:

Face rotations are now fixed! The only issue left is the lighting...

Resolved with Grondag's new baked-model system!