Edited by Paul Bourke Introduction Unreal models come in a combination of two files. Both are binary files. The data file contains a dataheader with number of polygons, number of vertices, etc. You'll also find each polygon with it's three vertices indexs. The index is the order of the vertex within the aniv file.
All polygons are triangles.
The Aniv file cotains the a list of the vertices per each frame. Then all the vertices for every frame. The data file header should be written to the file first. The only thing that you need to worry about is the number of polygons and the number of vertices. The rest of the information is not currently read by UnrealEd.