Method for and apparatus for transparency conversion, image proc

Details Method for and apparatus for transparency conversion, image proc Method for and apparatus for transparency conversion, image proc

1997-03-04

1999-03-09

Nguyen, Phu K.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

345422, G09G 116

Patent

active

058807357

ABSTRACT:
A transparency conversion circuit 40 is provided between a matrix conversion circuit 4 and an intensity calculation circuit 5 in a geometry processing unit 20. The transparency conversion circuit 40 is provided with a converter 41 and a parameter register 42. The converter 41 converts the transparency at the vertex that is input by the matrix conversion circuit 4 in correspondence to the Z component of the unit normal vector at the vertex, and the results are output to the intensity calculation circuit 5. The parameter register 42 holds a parameter value that is used for the conversion performed by the converter 41. As a result, the transparency at a polygon can be corrected while taking into consideration the angle formed by the planar surface of the polygon and the direction of the line-of-sight and the environment in which the polygon is placed. Therefore, a method for and an apparatus for transparency conversion whereby a translucent polygon is rendered to produce an impression of solidity are provided.

REFERENCES:
patent: 4727465 (1988-02-01), Bunker et al.
Procedural Elements for Computer Graphics, by David F. Rogers, 1985, Chapter Five "Rendering".

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