Whats Special About The CAVE

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Whats Special About The CAVE?
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180 Degree FoV but sight distances to the screen
differ
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What does distance do to resolution to the eye?

• Resolution in cycles per degree was number of
  pixels divided by twice the field of view in
  degrees.
• Closer to the screen results in less resolution
• If each screen is a different distance from the
  participant, then each screen provides a
  different visual resolution.

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Resolution for 1024 pixels per line
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• Front of CAVE, on average
• Arctan (5/10) 26.57degrees
• Total angle is 53 degrees
• 1024/(253) 9.7 cycles/deg
• Visual angle for the middle foot is
• 2arctan(0.5/10) 5.7 degrees
• 102.4/(25.7) 8.9 cycles per degree
• Immediately to the side
• 2arctan(0.5/5) 11.42 degrees
• 102.4/(211.42) 4.5 cycles/degree

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10
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The Perfect Display?
What if we had the same number of pixels (31024)
evenly spaced around half the circle? 3072/(2180)
8.53 cycles per second everywhere Note that
area is ?102/2 157 sq feet as compared to 100
sq ft. Linear length of screen is 31.4 feet as
compared to 30 feet
10
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Approximating the Circle?

• Three Screens of same length for a circle with 10
  foot radius.
• Equilateral Triangle
• Each screen is 10 ft. wide
• Average visual resolution is 1024/(260) 8.53
  cycles/degree
• Resolution for middle foot
• 2arctan(0.5/8.66) 6.6 deg
• 1024/(26.6) 7.76
• Area is 150 square feet

8.66
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Other configurations
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Alcove Display
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14.14
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