One definition requires both immersion in a computer generated scene and interactivity with the world. Immersion can be accomplished through the use of multisensory human computer interaction devices, i.e. head tracking helmets and touch feedback. Some say any three dimensional object model is an inherently immersive scene and that a good mouse interface provides interaction enough. VR applications are expanding. The military uses VR to train medics, the FBI uses virual hostage situations to test decision making, while NASA explores the surface of Mars and performs virtual windtunnel analyses.
Architects create future buildings and bridges as archeologists rebuild ruins.
International manufacturers solve language and distance barriers through graphics-based design collaboration and worker training. Virtual patients allow testing of new procedures. Similarly, students are exploring, testing, training, creating, and actively learning. That depends on how immersive and interactive the setup. All platform providers have committed to faster 3-D graphics.