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An ideal visibility algorithm should a) quickly reject most of the hidden geometry in a model and b) exploit the spatial and perhaps temporal coherence of the images being generated. Ray casting with spatial subdivision does well on criterion (a), but poorly on criterion (b). Traditional Z-buffer scan conversion does well on criterion (b), but poorly on(More)
  • Ned Greene
  • IEEE Computer Graphics and Applications
  • 1986
Various techniques have been developed that employ projections of the world as seen from a particular viewpoint. Blinn and Newell introduced reflection mapping for simulating mirror reflections on curved surfaces. Miller and Hoffman have presented a general illumination model based on environment mapping. World projections have also been used to model(More)
Contact author at greene@apple.com, Apple Computer, 1 Infinite Loop, Cupertino, CA 95014 We present a novel polygon tiling algorithm in which recursive subdivision of image space is driven by coverage masks that classify a convex polygon as inside, outside, or intersecting cells in an image hierarchy. This approach permits Warnock-style subdivision with its(More)
Creation of Omnimax animation by computer opens up fantastic new visual possibilities. Unfortunately, the fish-eye distortion of Omnimax film images complicates synthesis by computer, since most image-synthesis programs can create only perspective views. As an alternative to modifying existing image-synthesis programs to produce Omnimax projections(More)
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