Computer graphics processing and selective visual display system – Computer graphics processing – Graph generating
Patent
1998-06-01
2000-06-20
Powell, Mark R.
Computer graphics processing and selective visual display system
Computer graphics processing
Graph generating
G06T 1500, G06T 1140
Patent
active
060783354
ABSTRACT:
A method and apparatus for determining the level of detail for texture mapping applications in video graphic circuits begins by updating first and second linear components of a set of derivatives when rendering a pixel of an object in a given scan line. The first and second linear components are updated in a linear manner based on first and second increment values, respectively. The set of derivatives corresponds the changes of the texture coordinates with the changes of the physical coordinates of an object being rendered, the derivatives include .delta.s/.delta.x, .delta.t/.delta.x, .delta.s/.delta.y, and .delta.t/.delta.y--in general, the set of derivatives equals .delta.a/.delta.b=w.sup.2 *((1/w)*(.delta.(a/w)/.delta.b-(a/w)*(.delta.(1/w)/.delta.b))). When the object is being rendered on a new scan line, third and fourth linear components are updated in a linear manner based on third and fourth increment values, respectively. As the linear components are updated, their magnitudes are compared, and the one having the greatest magnitude is selected. The selected magnitude is then converted into a logarithmic scale to produce a logarithmic magnitude. The logarithmic magnitude of the linear component is then combined with a logarithmic representation of a non-linear component of a set of derivatives to obtain the level of detail for a given pixel.
REFERENCES:
patent: 5649078 (1997-07-01), Gerth
patent: 5831624 (1998-11-01), Tarolli et al.
patent: 5870097 (1999-02-01), Snyder
patent: 5870102 (1999-02-01), Tarolli
patent: 5886701 (1999-03-01), Chauvin
patent: 5945997 (1999-08-01), Zhao
patent: 5949426 (1999-09-01), Rich
patent: 5953015 (1999-09-01), Choi
patent: 5977977 (1999-11-01), Kajiya
patent: 6005582 (1999-12-01), Gabriel
patent: 6005584 (1999-12-01), Kitamura
patent: 6009345 (1999-12-01), Taubin
Aleksic Milivoje
Wong Daniel
ATI Technologies Inc.
Powell Mark R.
Sajous Wesner
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