Apparatus and method for performing perspectively correct interp

Details Apparatus and method for performing perspectively correct interp Apparatus and method for performing perspectively correct interp

1996-02-15

1998-07-07

Jankus, Almis R.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

G06T 1500

Patent

active

057776237

ABSTRACT:
In an apparatus and method for performing perspectively correct interpolation of texture coordinates in computer graphics, an incremental interpolation technique is used to calculate pixel values along a display line from an associated texture map. In order to evaluate divisions within the hyperbolic equations relating the texture coordinates to pixel position, the incremental technique performs a log subtraction in which the log of the fractional part of a number is looked-up, while the exponent part of the number is tracked separately. The differential of each texture coordinate is tracked. Further, the incremental technique is arranged so as to render the pixels either from left to right or from right to left depending upon which edge of the polygon being rendered is closer to the viewer and hence at which of the polygon edges accumulated errors will be most visible.

REFERENCES:
patent: 5594854 (1997-01-01), Baldwin et al.
Hecker "Perspective Texture Mapping by Chris Hecker" Part III Endpoints and Mapping, Sep. 1995.
"Computer Graphics Principles and Practice" by Foley, van Dam, Feiner and Hughes, 2nd Edition, Addision-Wesley Publishing Company, ISBN 0-201-12110-7, pp. 741 to 745.
"Hyperbolic Interpolation" by James F Blinn in Jim Blinn's Corner, IEEE Computer Graphics and Applications, Jul. 1992.
"The Art of Electronics" by Horowitz and Hill, Cambridge University Press, 2nd Edition, ISBN 0-521-37095-7, pp. 738 to 741.

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