Finish [OBJ](https://en.wikipedia.org/wiki/Wavefront_.obj_file) format Research more formats: [STL](https://en.wikipedia.org/wiki/STL_(file_format)) [FBX](http://download.autodesk.com/us/fbx/2010/fbx_sdk_help/index.html) [3DS](https://en.wikipedia.org/wiki/.3ds) [COLLADA](https://www.khronos.org/files/collada_spec_1_5.pdf) [BLEND](https://wiki.blender.org/index.php/Dev:Source/Architecture/File_Format)
Finish OBJ format
Research more formats:
STL
FBX
3DS
COLLADA
BLEND