to provide a minimal and complete Object-Oriented (OO) thread interface for C++ programmers. It is loosely modeled on the Java thread API, and the POSIX Threads standards. The architecture of OpenThreads is designed around "swappable" thread models which are defined at compile-time in a shared object library. It is of importance to note that while a factory pattern design could have been used to achieve the goal of generic interface, it would have required the programmer to allocate each of the 4 fundamental types (Thread, Mutex, Barrier, & Condition) on the heap. Due to the cost associated with heap allocation of the underlying concrete implementations of these constructs on some platforms, such allocation was deemed unacceptable at the time this library was originally written, and thus the factory pattern was not used. Instead, a somewhat abstruse - but effective - technique was chosen to provide the necessary data/implementation hiding. This technique uses private void pointers to encapsulate object private data. The void pointers actually point at concrete data structures, but give a uniform interface to the dso. The design goal of OpenThreads is to construct optimized implementations using platform optimized multi-processing constructs such as the sproc methods used on IRIX, and Windows threads. osgUtil osgUtil contains rendering backend functionality and utilities taking care of scene graph traversal, rendering optimisation and transforming the scene into a stream of OpenGL API calls. It also provides means of basic interaction with scene, such as object picking. osgDB This library is tasked with loading 3D model files. It supports many 2D/3D data formats manipulators. More than 50 different formats are supported - most common are 3D data formats, such as COLLADA (.dae), LightWave (.lwo), Wavefront (.obj), OpenFlight (.flt), 3D Studio Max (.3ds), DirectX (.x) and many others. OpenSceneGraph also provides its own native ASCII .osg format. There are exporters into .osg format available for Blender, Maya and 3D Studio MAX. Supported picture formats include .rgb, .gif, .jpg, .png, .tiff, .pic, .bmp, .dds, .tga and quicktime. This module also provides I/O device abstraction. The other file-format loader plugins are registered with osgDB. osgGA This is a GUI abstraction library required for different platforms. osgViewer osgViewer Library provides a quick and easy way of visualizing the graphics scene. It is also a platform-independent abstraction for various window system interfaces. osgProducer The OSG is also shipped with a osgProducer which is just a platform-independent viewer supporting multiple