Blender >> Unity...

EVERY SINGLE model that I exported from blender (.blend, .fbx, and every other combo possible) has appeared glitchy and wiry when I imported it into unity. What problem is this? How can this be solved? is it my blender version?

Please help, I need this before the end of today.

Thanks in advance!

Your normals are all pointed the wrong way.

In Blender (2.49, I don’t know 2.5+), go into edit mode, select all your vertices, then press w > Flip Normals, or control+N (recalculate normals).

It looks like the tunnels have a few normals pointed the right way already, so you may want to use ctrl+N for those.