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Viewing History
View Volumes in the VRC System
View Volume (visible part of the world) defined by:
- window on view plane
- center of Projection (COP) for perspective projection
- direction of Projection (DOP) for parallel projection
- projection Reference Point (PRP)
- and Center of Window (CW)
PRP and CW are used to determine COP and DOP
- perspective: COP = PRP
- parallel: DOP = CW - PRP



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Viewing History - 10 MAY 95
Page 37 of 44
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