虚拟现实virtualreality的介绍.ppt

What are these ? What are they used for? What is Virtual Reality? Definition Features Crucial Technologies Applications Definition Virtual reality (VR) is a technology which allows a user to interact with a computer-simulated environment . Features Immersive Interactive Real time Viewer centered Crucial Technologies 1.Display system —immerse the user in the virtual world and block out contradictory sensory impressions from the real world 2.Graphics rendering system —generates, at 20 to 30 frames per second, the ever-changing images 3.Tracking system —continually reports the position and orientation of the user’s head and limbs 4.Virtual world construction and maintenance system —building and maintaining detailed and realistic models of the virtual world Applications Manufacture Profession training Game Education manufacture Profession training game education * 广技师10计本2班21号汪志锋 Head Mounted Display VR Data-glove Playing game working 1.Display system Display technology advances very rapidly VR display system must provide immersion Desktop displays are not considered to be VR Hardly block out the real world Do not present virtual world objects in life size Do not create the illusion of immersion CAVE Cave Automatic Virtual Environment An immersive virtual reality environment where projectors are directed to 3, 4, 5 or 6 of the walls of a room-sized cube Head-Mounted Display Worn on the head or as part of a helmet A small display optic in front of one or each eye 3.Tracking system Tracking observer’s body coordinate / head motion Challenges: Accuracy（精度） Ergonomics（人类工程学） System latency（系统时间延迟） Head Tracking A tracking mechanism registers any head motion by the user. When a user moves her head, the scene changes accordingly, just as in real life . * * * * A good novel is immersive without any fancy graphics or audio hardware. You see and hear and touch and taste and smell A good play or a film or an opera can be immersive using on