Three dimensional graphics processing apparatus processing ordin

Details Three dimensional graphics processing apparatus processing ordin Three dimensional graphics processing apparatus processing ordin

1996-05-31

1998-10-27

Jankus, Almis R.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

G06T 1500

Patent

active

058283781

ABSTRACT:
A three-dimensional graphics processing apparatus according to the present invention is provided with a memory which stores objects including an ordinary object and a special object, each object composed of polygons. A coordinate conversion processing device places each object stored in the memory in a three-dimensional coordinate system, and converts the coordinates of the placed object into those of a screen coordinate system. A MIN/MAX buffer memory stores Z values of front polygons of the special object and Z values of rear polygons of the special object. A drawing processing device determines whether or not Z values of a polygon of the ordinary object are values between the Z values of the front polygons and the Z values of the rear polygons of the special object stored in the MIN/MAX buffer memory. The drawing processing device performs a predetermined special operation when it is determined that the Z values of the polygon of the ordinary object are values between the Z values of the front polygons and the Z values of the rear polygons of the special object.

REFERENCES:
patent: 5448690 (1995-09-01), Shiraishi et al.
patent: 5455900 (1995-10-01), Shiraishi et al.
patent: 5596685 (1997-01-01), Ashton
"Simple Shadow Producing Method Using The Z-Buffer Method", by Kazuya Shimizu et al. p. 2053 (1985).

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