Boots – shoes – and leggings
Patent
1987-10-30
1989-08-08
Harkcom, Gary v.
Boots, shoes, and leggings
364521, 340747, G06F 1568
Patent
active
048559385
ABSTRACT:
Polygon vertex data is processed in three steps to create a graphics display without hidden lines and without gaps in the displayed lines. The technique permits the processing of triangles rather than polygons having four or more sides. In the first step, the Z values for the display points for the visible edges of the polygons are identified and assigned a reserved value ZCLOSE in a frame buffer. In the second step, the polygons are tessellated into triangles and the Z values for the display points on the triangles are computed and each depth buffer storage location is updated so as to contain the value of points closest to the viewpoint while the frame buffer is written with a background color. In the final step, the Z values for the display points of the polygon edges are again computed and compared with the corresponding Z values in the depth buffer. The depth buffer is updated with the computed values if the stored value is equal to ZCLOSE or if the computed value represents a position closer to the viewpoint than the stored value and the frame buffer is then written with a foreground color for the display point in question.
REFERENCES:
patent: 4222048 (1980-09-01), Johnson
patent: 4594673 (1986-06-01), Holly
patent: 4609917 (1986-09-01), Shen
patent: 4609993 (1986-09-01), Shimizu
patent: 4625289 (1986-11-01), Rockwood
patent: 4684990 (1987-08-01), Oxley
patent: 4697178 (1987-09-01), Heckel
patent: 4719585 (1988-01-01), Cline et al.
patent: 4730261 (1988-03-01), Smith
Sutherland et al. "A Characterization of Ten Hidden-Surface Algorithims" Tutorial Computer Graphics COMPCON 79, pp. 293-347.
"Fundamentals of Interactive Computer Graphics" by Foley and Van Dam, published by Addison-Wesley Publishing Company (1982), pp. 560-561.
Gonzalez-Lopez Jorge
Liang Bob C.
Harkcom Gary V.
International Business Machines - Corporation
Moore J. Dennis
Nguyen Phu K.
Walker Mark S.
LandOfFree
Hidden line removal method with modified depth buffer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hidden line removal method with modified depth buffer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hidden line removal method with modified depth buffer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-911000