Head-Tracked Displays (HTDs)

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Head-Tracked Displays (HTDs)

• Sherman and Craig, pp. 140-151

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Head-tracked Displays

• Displays in which the users head is tracked and
  the image display screen is located at a fixed
  location in physical space.
• Examples?
• CRT
• Virtual Workbench or ImmersaDesk
• CAVE
• Many large screen displays

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CRT HTD (Fishtank VR)
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Stereoscopic Display
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Virtual Workbench
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CAVE
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Any Projected Large Stereoscopic Screen
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Characteristics

• Large
• Projection-Based (except for Fishtank VR)
• Stereoscopic
• Head Tracked
• Stationary Display Screen(s)
• Lets try to identify the pros and cons and
  application domains

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Large Screen Projection

• 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

• Larger field-of-view than HMD
• Field of regard is smaller than HMD but larger
  than a typical CRT Display
• Projectors must be aligned properly.

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Large Screen Projection

• 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

• Advantages
• Viewer not isolated from real objects or other
  people in the virtual world space.
• Less physical gear to wear than HMD
• Potentially better resolution than HMD
• Large field of view compared to HMD or CRT.