The original CAVE system consisted of two walls and a floor. A research group at Iowa State University is developing a four-wall, floor, and ceiling display they call the C2 inside an engineering building that is currently under construction. Logitech created a tracking device that used ultrasonic microphones to pick up on an ultrasonic wave source placed in front of the display device. This is a very directional system, and, incidentally, the basis of the Nintendo PowerGlove system. Memory is replicated at each node in the network and data is transfered by very high speed fiber optic links.
Most developers still write their own navigation and interface toolkits.
Unlike 2D window managers, there is very little standardization for 3D iconization or interface tools. Based on IRIS Performer for Silicon Graphics Onyx hardware. Can be used for non-CAVE systems. Any virtual environment with multiple display screens can be designed with this library by registering the appropriate transformation with each wall. Up to eight screens are supported.