1. Head-Tracked Displays (HTDs) Sherman and Craig, pp. 140-151

2. Head-tracked Displays Displays in which the user’s head is tracked and the image display screen is located at a fixed location in physical space. Displays in which the user’s head is tracked and the image display screen is located at a fixed location in physical space. Examples? Examples? CRT CRT Virtual Workbench or ImmersaDesk Virtual Workbench or ImmersaDesk CAVE CAVE Many large screen displays Many large screen displays

3. CRT HTD (Fishtank VR) 3D Glasses Head Tracker Stationary Display

4. Stereoscopic Display User C A B Screen C A B Standard DisplayStereoscopic Display

5. Virtual Workbench 3D Glasses 3D Display 3D Object

6. CAVE

7. Any Projected Large Stereoscopic Screen

8. Characteristics Large Large Projection-Based (except for Fishtank VR) Projection-Based (except for Fishtank VR) Stereoscopic Stereoscopic Head Tracked Head Tracked Stationary Display Screen(s) Stationary Display Screen(s) Let’s try to identify the pros and cons and application domains Let’s try to identify the pros and cons and application domains

9. 3D Glasses 3D Display 3D Object

10. Large Screen Projection Larger field-of-view than HMD Larger field-of-view than HMD Field of regard is smaller than HMD but larger than a typical CRT Display Field of regard is smaller than HMD but larger than a typical CRT Display Projectors must be aligned properly. Projectors must be aligned properly. Architectural Statement! Front Projection (user may be in the way). Back Projection (takes up even more space) When multiple screens are arranged at or near 90 degree angles, reflection between screens may be a problem

11. Large Screen Projection Advantages Viewer not isolated from real objects or other people in the virtual world space. Viewer not isolated from real objects or other people in the virtual world space. Less physical gear to wear than HMD Less physical gear to wear than HMD Potentially better resolution than HMD Potentially better resolution than HMD Large field of view compared to HMD or CRT. Large field of view compared to HMD or CRT. Disadvantages Usually one one person is head-tracked. Real objects may occlude virtual objects in inappropriate ways Multiple screens require more computation At least one direction is not part of the virtual world. Lighting