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import:PLY, STL, OFF, OBJ, 3DS, COLLADA, PTX, V3D, PTS, APTS, XYZ, GTS, TRI, ASC, X3D, X3DV, VRML, ALN
export:PLY, STL, OFF, OBJ, 3DS, COLLADA, VRML, DXF, GTS, U3D, IDTF, X3D

(short name: Assimp) is a portable Open Source library to import various well-known 3D model formats in a uniform manner. The most recent version also knows how to export 3d files and is therefore suitable as a general-purpose 3D model converter.

Supported formats include OBJ, 3DS, BLEND, STL, FBX, DXF, LWO, LWS, MD5, MD3, MD2, NDO, X, IFC and Collada, the total number of formats is 40+.

input formats: 3d, 3ds, fbx, ac, ac3d, acc, ase, ask, b3d, blend, bvh, cob, csm, dae, dxf, enff, hmp, ifc, irr, irrmesh, lwo, lws, lxo, md2, md3, md5anim, md5camera, md5mesh, mdc, mdl, mesh.xml, mot, ms3d, ndo, nff, obj, off, pk3, ply, prj, q3o, q3s, raw, scn, smd, stl, ter, uc, vta, x, xml, xgl
export formats: stl, stlb, collada, obj, 3ds, ply, json, x

winmeshview reads meshes in .ply, .3ds, .face, .obj, and .smesh format, and writes meshes in .smesh, .face/.node, Abaqus .inp, and .obj format. It can also export to a format referred to as ".anode", which is the equivalent of a TetGen node file with only a reference to an element file.

meshconv converts to and from several popular 3D file formats. Currently only geometry conversion is supported.
Features
•input and output formats:
◦nearly 100% VRML 2.0 support (input 2.0, output 1.0 and 2.0)
◦simple geometry only support for Wavefront OBJ, Geomview OFF, Autocad DXF, PLY, 3DS, and STL

is a tool for previewing and converting between hundreds of model, image, and animation formats.
It utilizes a robust plugin system, with support for native extension modules and Python scripts. The plugin/script API features hundreds of functions and interfaces which assist in developing new formats, tools, and visualization aids.

Biturn - is converter of 3D files and Bitmaps. It works with most used file formats and also can work with formats from various games ( see table below ).
If you want to extract data from games, try reading my gamedata document for a guidelines. If you work with 3dsMax 5 and you don't have support for .ASE file format then download this ASE import / export plugin for best data support.
Simon Engledew has recompiled ASE plugin also for 3dsMax 6 and 7

3D Formats	reading	writing
3D Studio - ASC	GM	GM
3D Studio - 3DS	GM	GM
3DS Max ascii - ASE	GMT	GMST
Blitz 3D - B3D	GMST	GMST
Direct X ascii - X	GM	-
Final Fantasy 7 battle - ??AA	GMSTA	-
FF7 field - HRC, RSD	GMSTA	-
FF7 - P	GMT	-
FF7 - PSX LZS	GM	-
Helion - 3DF	GM	GM
HalfLife - MDL	GMSTA	-
Jawed - JAW	G	G
Lightwave - LWO	GM	GM
Lightwave 6.5+ - LWO	GMST	GMST
Milkshape ascii - TXT	GM	GM
Milkshape - MS3D	GM	GM
? - MON	GM	-
Oolg text format - OFF	G	G
Oni character model - ONCC	GTS	-
Oni model - M3GM	GT	-
Open Flight - FLT	GMT	-
Quake 1 model - MDL	GTA	-
Quake 2 model - MD2	GTA	-
Quake 3 model - MD3	GTA	-
raw 3d polygons - RAW	G	G
Revolt - M	G	-
Requiem - MDL	G	-
Rhinoceros - 3DM	G	-
SoftImage asci - XSI	GMT	GMT
Truespace - COB	GM	-
Turbo Silver - IOB	GM	-
Viper Racing - MOD	GT	GT
Virtua Fighter 1 - BIN	G	-
Wavefront - OBJ	GMT	GMT
Warcraft 3 - MDX	GMT	-

Bitmaps	 
Bitmap - BMP	PA	PA
Cell - CEL	P	P
Etherlords - MMP	PA	-
Final Fantasy 7 - TEX	PA	PA
Final Fantasy 8 - MIM	PA	-
Final Fantasy 8 - TIM	PA	-
Jpeg - JPG	P	-
Megaman Legends - TM	P	-
Oni big texture - TXMB	PA	-
Oni texture - TXMP	PA	PA
Pixel map - PPM	P	P
SGI bitmap - RGB	PA	PA
Targa - TGA	PA	PA
Viper Racing - TEX	PA	PA
Warcraft 3 - BLP	PA	PA
World of Warcraft - BLP	PA	PA
Z80 screen - SCR	P	-
Mafia - 555	PA	-
Adobe Photoshop - PSD	PA	PA
Direct X texture - DDS	PA	PA

... we support a wide variety of file formats such as DXF, AC3D, Collada, Max3DS, MD2, MD5, OBJ, but we have also developed our own powerful and compact AWD format. With plugins for several 3D authoring environments,