There is an ongoing effort to connect NiCE to different types of Virtual Reality environments in easy to use and intuitive ways. Some of that work is documented here.
We are developing a Syzygy Plug-in that will render data used by NiCE in a cave (VR, not stone!).
Syzygy Build Tricks
Syzygy fails to build out of the box on 64-bit Fedora 17. There are some problems:
Syzygy depends on VRPN, optionally. VRPN is easy to build with scratch because it uses CMake. Most people will want to pass
-DVRPN_GPL_SERVER=on
to build with GPM support on Linux.