Log Message:
Import OpenSceneGraph-2.8.1 as wip/openscenegraph.

The OpenSceneGraph is an open source high performance 3D graphics toolkit, used
by application developers in fields such as visual simulation, games, virtual
reality, scientific visualization and modelling. Written entirely in Standard
C++ and OpenGL it runs on all Windows platforms, OSX, GNU/Linux, IRIX, Solaris,
HP-Ux, AIX and FreeBSD operating systems. The OpenSceneGraph is now well
established as the world leading scene graph technology, used widely in the
vis-sim, space, scientific, oil-gas, games and virtual reality industries.