Virtual reality is an immersion into an environment that allows the user to see, hear and sometimes feel what is going on. The user can interact with that environment in many different ways. This requires the user to wear a helmet-type device that includes a face mask with a high-resolution stereoscopic display, headphones for sound, and a feedback device, usually worn on the hands. These devices provide the 3-D image and track eye and head movement. The 3-D images are created using multi-headed cameras or in 3-D animation or engineering modeling software.
When all of these are put together, the user can walk through an environment and experience the product, assembly line or factory layout. When the user moves his head, hands or body, the environment in the display device changes to reflect the new position.
