md3tomdl is a command line program for doing exactly one thing: converting a md3 file to mdl format.

Download md3tomdl v0.4

Version 0.4 fixes an error in the export process relating to MD3 files with a non-zero origin set on the frames, and a crashing bug if a skin file is not specified.

There’s a fairly detailed readme explaining exactly what md3tomdl does and how to use it. It also comes with the source files for generating the gothic arch window¬†model from this site, so you’ll be able to get to grips with it right away. The file also comes with the full c++ source code for the tool.