Stippled lines using direct distance evaluation

Details Stippled lines using direct distance evaluation Stippled lines using direct distance evaluation

2007-05-22

2007-05-22

Tung, Kee M. (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics processing

Shape generating

C345S418000

Reexamination Certificate

active

10742558

ABSTRACT:
Stippled lines are drawn by evaluating a distance function for a set of points within the area of a stippled line. The distance function gives a distance value proportional to the distance from a point to the end of the stippled line. Using the point's distance value, a pattern index value defines a correspondence between a point and at least one stipple pattern bit. The value of pattern bits are applied to the points on the stippled line, masking the points such that only a portion of the set of points are displayed or determining intensity values according to the position of the points within the stipple pattern. A distance function may be an edge equation associated with the line end or a segment of a polyline. The distance function can be evaluated for the set of points in any order, allowing portions of a stippled line to be drawn in parallel.

REFERENCES:
patent: 2004/0130552 (2004-07-01), Duluk et al.
Hatching and shading: Weighted Voronoi stippling Adrian Secord, Jun. 2002 □□.
Non-photorealistic rendering: Fast primitive distribution for illustration Adrian Secord, Wolfgang Heidrich, Lisa Streit, Jul. 2002.
Collapsing flow topology using area metrics Wim de Leeuw, Robert van Liere, Oct. 1999.
A projective drawing system Osama Tolba, Julie Dorsey, Leonard McMillan, Mar. 2001.
Session G: Image-based methods: Rendering optimisations for stylised sketiching Holger Winnemöller, Shaun Bangay, Feb. 2003.
Session P7: volume visualization II: Non-photorealistic volume rendering using stippling techniques Aidong Lu, Christopher J. Morris, David S. Ebert, Penny Rheingans, Charles Hansen, Oct. 2002.
Incremental and hierarchical Hilbert order equation polygon rasterizatione Michael D. McCool, Chris Wales, Kevin Moule Aug. 2001.

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