Computer graphics system of general surface rendering by exhaust

Details Computer graphics system of general surface rendering by exhaust Computer graphics system of general surface rendering by exhaust

1985-01-09

1986-11-25

Gellner, Michael L.

Boots, shoes, and leggings

364518, 382 41, G06F 1568

Patent

active

046252894

ABSTRACT:
A z-buffer technique of exhaustive sampling is disclosed for rendering general surfaces in a computer graphics system. The system avoids the need for surface normal calculations or the computation of surface intersections with either ray or plane. It employs a dense surface scan of the object, which produces sample points on the surface. The samples thus obtained are passed through viewing transformations and then sorted into a z-buffer. The z-buffer retains the nearest sample to the viewer for each pixel, recording its x, y and z co-ordinates in object space. The surface normal at each pixel is estimated by comparison of neighboring entries and the corresponding intensity value is computed according to a standard illumination model.
As disclosed, the system is applicable to a wide variety of surface types, e.g. parametric, implicit and procedurally defined surfaces; and to a wide variety of display styles such as shadowing, texturing and hidden-line.

REFERENCES:
patent: 3816726 (1974-06-01), Sutherland et al.
patent: 3889107 (1975-06-01), Sutherland
patent: 4570233 (1986-02-01), Yan et al.

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