OpenGL implementation
From LinuxMCE
If your hardware have 3D capabilities, Orbiter can enable the "OpenGL mode", and that thing is made by have in /etc/Orbiter.conf the line: UseOpenGL=1
The next sections will cover the way that OpenGL is implemented in Orbiter and how you may customize and extend the current implementation.
That document will cover the next sections:
Mesh classes - geometry container classes Texture Manager and OpenGLGraphic description Orbiter-OpenGL 3D Engine Fonts in OpenGL
Obsolete:
Drawing widgets engine GL2DEffectFactory