3D Virtual Reality
3D Virtual Reality refers to an artificial 3-dimensional environment created with software that immerses the user in it, causing him/her to suspend disbelief and accept it as a real environment.
The simplest form of virtual reality is a 3D image that can be explored interactively at a personal computer or gyroscope-enabled mobile phone, usually by manipulating keys and mouse or moving the phone around in 360° so that the content of the image moves in some direction or zooms in or out. More sophisticated versions of 3D Virtual Reality involve approaches as wrap-around display screens, actual rooms augmented with wearable computers, and haptics devices that let you feel the display images.
Virtual reality tricks your brain into believing you are in a 3D world. The first way VR does this is with the stereoscopic display. This works by displaying two slightly different angles of the scene to each eye, simulating depth. This along with other ways to simulate depth like parallax (farther objects to you seem to move slower), shading and techniques create an almost life like experience.
With a VR-viewer you can wear a display in front of your eyes. The screen is enlarged, so every eye sees half of the screen. Through this stereoscopic effect the illusion of depth is created. This picture is called 3D. Through head-tracking a user can look around, because all the images are 360 degrees and the movement of the head is determined. This creates a powerfully immersive experience called 3D Virtual Reality.