I've made a very large architectural (Made for an interior) piece, but it's got a problem. When I export it to a .nif it looks fine in NifSkope, but when I view it in the CS or in-game it disappears when the camera gets close to it.
Possible causes:
Normals: The meshes normals weren't properly flipped, but even after doing it it has this problem.
Version: I started work on this model on Blender 2.58, without a .nif exporter installed. I then saved it as a .blend file and took it to a computer that's got 2.49b and I've been working on it there since.
I'm not sure what causes this problem exactly, but I need to solve it soon before I can continue any work on the model.
Here's the latest version of the model, cut down to a single section of it that still shows the problem.
http://www.mediafire.com/?nzc011ck3wsq1fk
Much appreciated if you can help!