Polygon overlap extraction method, and polygon grouping method a

Details Polygon overlap extraction method, and polygon grouping method a Polygon overlap extraction method, and polygon grouping method a

1996-06-05

1998-11-03

Zimmerman, Mark K.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

345505, G06T 120, G06T 1160

Patent

active

058316280

ABSTRACT:
A polygon overlap extraction method extracts an overlapping relationship of polygons in a computer graphics system which plots a polygon having a transmitting attribute and a polygon having a non-transmitting attribute based on a polygon model. The polygon overlap extraction method includes the steps of (a) obtaining a first value which indicates a visible surface from data related to the polygon having the non-transmitting attribute and a second value which indicates a visible surface from data related to both the polygons having the non-transmitting attribute and the transmitting attribute, with respect to each pixel, (b) comparing the first value and the second value and judging whether or not an overlapping relationship exists between the polygon having the transmitting attribute and the polygon having the non-transmitting attribute at each pixel, and (c) obtaining a polygon set of the polygon having the non-transmitting attribute and the polygon having the transmitting attribute which are judged as having the overlapping relationship.

REFERENCES:
patent: 4924414 (1990-05-01), Ueda
patent: 4970636 (1990-11-01), Snodgrass et al.
patent: 5027292 (1991-06-01), Rossignac et al.
patent: 5280568 (1994-01-01), Obata
patent: 5471567 (1995-11-01), Soderberg et al.

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