Precision Z-interpolation method and apparatus

Details Precision Z-interpolation method and apparatus Precision Z-interpolation method and apparatus

1991-01-16

1996-07-30

Herndon, Heather R.

G06T 1500

Patent

active

055420257

ABSTRACT:
A precision Z-interpolator for use in an interactive graphics system multiplies the line slope by a value f.sub.S in computing the first Z ordinate value. This eliminates the offset error in Z inherent in previously known interpolators. For extremely large slopes, the slope is not used directly in the computations. Instead the value used is (Z.sub.E -Z.sub.S)/(1+f.sub.E /f.sub.S) (see FIG. 4).

REFERENCES:
patent: 4805116 (1989-02-01), Liang et al.
patent: 5025405 (1991-06-01), Swanson
Fundamentals of Interactive Computer Graphics, Ch. 12, by J. D. Foley and A. Van Dam, ISBN: 0-201-14468-9, 1982.

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