Method for displaying a portion of the body
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United States of America Patent
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Jun 22, 1993
Grant Date -
N/A
app pub date -
Oct 31, 1989
filing date -
Nov 4, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The problems of selection of objects having complex shapes and usually apprehended by a plurality of facets are solved by making use of curved surfaces, the equation of which is of the second degree. In a test calculation for checking whether a node of an octree decomposition does or does not belong to the surface thus defined, the terms of the second degree are replaced by a constant. It is shown that this approximation permits rapid determination of the complex shapes without having to perform the calculations corresponding to the second degree. The method also permits easy determination of the normal to the object for calculation of shadowing when it is employed for display.
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