The interfaces are:
CAVElib (vrco.com)
vrJuggler (vrjuggler.org)
FreeVR (freevr.org)
SDL (libsdl.org)
GLUT (opengl.org)
GLX

Needed:
pak0.pk3 - data file from Q3A demo
zlib, libjpeg - for compiling

In many ways, Quake3 Arena represents the state of the art in real-time rendering. The CQ3A engine implements many of the features that are in the real game including multi-pass shaders, curved surfaces (bezier patches), bsp tree with pvs testing/culling, lightmaps, animations, skybox rendering, etc

Even if you don't care about gaming, the Quake3 format is a great format for creating original 3D content. There are several free map editors available, including the incredibly powerful QERadiant. Now you can easily import worlds created with these tools into the CAVE!

It is open-source (GPL) and cross-platform. I restructured the engine so that it can handle multiple rendering contexts and multiple rendering pipes. For details, read this short VR source article. The result is that CQ3A can compile with 6 different interfaces! Each interface is small and completely separate from the rest of the engine.

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