Boundary evaluation in non-manifold environment
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United States of America Patent
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Oct 1, 1996
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N/A
app pub date -
Dec 8, 1994
filing date -
Feb 3, 1992
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Expired
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Abstract
An information processing system performs boundary evaluation in a non-manifold environment. The system may be used for representation of objects in three dimensions, in a very general manner. Objects are represented by merging boundary representations of constituent sub objects, and selecting portions of the resulting merge boundary representation. Selection is based on criteria applied to a containment history of each portion of the merged boundary representation. A data structure suitable for boundary evaluation in a non-manifold environment includes a constructive solid geometry tree and a boundary representation. The boundary representation further includes boundary descriptions, a list of regions, containment histories of each region and a mark indicative of selection or non-selection of each region.
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