Method and apparatus for directly evaluating a parameter interpo

Details Method and apparatus for directly evaluating a parameter interpo Method and apparatus for directly evaluating a parameter interpo

1995-06-21

1997-12-23

Nguyen, Phu K.

G06F 1500

Patent

active

057014051

ABSTRACT:
A method and apparatus for directly evaluating a parameter interpolation function in a computer graphic system that renders a geometric entity (such as a polygon) by partitioning a display device into a number of local regions. The computer graphic system initially determines that a first set of pixels in a first local region of the display device is covered by a geometric entity. A geometric entity's boundary defining data (e.g., the geometric entity's vertex coordinates defined relative to a display device coordinate system) is employed to generate a local set of coordinates that are defined relative to a first local coordinate system of the first local region for all pixels of the first set of pixels. A first local parameter interpolation function, which represents the parameter values for all pixels of the first set of pixels when these pixels are defined relative to the first local coordinate system, is then generated. The local parameter interpolation function and the local set of coordinates are used to directly calculate the parameter values of the pixels of the first set of pixels.

REFERENCES:
patent: 5457775 (1995-10-01), Johnson, Jr. et al.
James D. Foley, et al, Computer Graphics Principles and Practice, 2nd ed. "Filling Polygons" 1990, pp. 92-95.
Fuchs, Henry, et al., "Pixel-Planes 5: A Heterogeneous Multiprocessor Graphics System Using Processor-Enhanced Memories", ACM Computer Graphics, vol. 23, No. 3, Jul. 1989, pp. 79-88.
Akeley, Kurt, et al., "High Performance Polygon Rendering", ACM Computer Graphics, vol. 22, No. 4, Aug. 1988, pp. 239-246.
Potmesil, Michael, et al, "The Pixel Machine: A Parallel Image Computer", ACM Computer Graphics, vol. 23, No. 3, pp. 69-78.

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