3D Geometry Specifications: 3DS - The 3D Studio Format MLI - 3D Studio's Material-Library Format BYU - Movie BYU file format DEM - USGS Standards for Digital Elevation Models [Link] DXF - Used by Autodesk's AutoCAD DXF Release 13 specification [Link] DXF Release 12 specification / [Link] DXF Release 10 specification / [Link] Creating DXF files FIG - Used by REND386/AVRIL FLT - MulitGen Inc.'s Open