that this is utilized is by setting the new environment variable
VJ_DRAW_THREAD_AFFINITY to a space-separated list of zero-based
integer CPU identifiers. User-level code can change the mechanism
(for the OpenGL Draw Manager) by calling
vrj::GlDrawManager::setCpuAffinityStrategy(). For now, only the
OpenGL Draw Manager is utilizing this new feature. The Direct3D
Draw Manager does not appear to be multi-threaded at the moment,
so it has not use for it. I did not look into usage of this with
the Performer Draw Manager.