STL

STL (S Tereo Lithography) is a file format native to the stereolithography CAD software created by 3D Systems. STL is also known as Standard Tessellation Language.[1] This file format is supported by many other software packages; it is widely used for rapid prototyping and computer-aided manufacturing (CAM) (Desktop Fab). STL files describe only the surface geometry of a three-dimensional object without any representation of color, texture or other common CAD model attributes. The STL format specifies both ASCII and binary representations. Binary files are more common, since they are more compact. http://en.wikipedia.org/wiki/STL_(file_format)

GitHub support! https://help.github.com/articles/3d-file-viewer

• Apr'2013 https://github.com/blog/1465-stl-file-viewing
• Sept'2013 visual diff! http://techcrunch.com/2013/09/18/github-adds-3d-modeling-features-that-make-it-a-printer-agnostic-choice-for-object-sharing/