GTO is an open source file format designed for computer graphics. It was developed by Tweak Films to serve as the core storageformat for our geometry and rendering pipeline. GTO is used by VFX and animation facilities, post-houses, and game developers for a wide variety of applications. It’s small size and versatility make it useful for animation, modeling, particle dynamics and 3D paint. It can be used to replace file formats such as PDB/PDC, obj, and binary RIB.
At heart GTO is just a clean and optimal way of storing large, named, and organized arrays of binary data (although there is a text version of the file too). GTO naturally lends itself to a “least common denominator” role between computer graphics applications. The storage mechanism and the data layout are independent, so that the format can be easily adopted without regard to how the format is used by any particular application. The GTO library has bindings in C++ and Python making it relatively easy to develop custom tools to read, write and manipulate GTO files.

The GTO library includes the low-level reader and writer classes, a slightly higher level raw data reader/writer, and source code for a Maya scene and particle export, particle display, a Maya deformer to use GTO as a geometry cache, Houdini plug-ins, a number of command line tools, a Wavefront .obj parser (for a command line converter), and a Python module for reading and writing GTO files. The GTO reader/writer and tools have been tested thoroughly in feature film and game production on GNU/Linux and OSX as well as Windows XP, Vista, and 2000. GTO is also used as part of Tweak Software’s commercial products.

Home Page:
Project Page:
Language: C++
Platform: Linux, Windows, OS X, etc
License: GNU Library General Public License with exceptions for static linking.
Sponsor: Tweak Films