GMF

The GMF (Gabriel Meta File) is a 3D geometry and physics properties format used by GI in it's games. It derivates from the ASE file format. It is closely tied to 3dsmax and havok, but can also be edited using notepad, a paper and a pencil. It can either be used to describe a component, arena or even a the max_sphere.gmf file.

These files can be either compiled or uncompiled. In the uncompiled form, it's an easily editable, ASCII file conating vertex coordinates, faces and face normals. To convert between these two formats, you can use Dummee's GMF compiler/decompiler.