Method and system for performing perspective divide operations o

Details Method and system for performing perspective divide operations o Method and system for performing perspective divide operations o

1997-02-28

1999-08-10

Powell, Mark R.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

345433, G06F 1720

Patent

active

059366273

ABSTRACT:
A method and system for performing perspective divide operations on three-dimensional graphics data within a computer system is disclosed. In accordance with the method and system of the present invention, a 3-D graphical image is represented by three-dimensional graphical object data via a number of vertices. In a first iteration, the following steps are performed concurrently: computing a set of clip coordinates for a vertex z', w'!; refining an estimate value of 1/w' for a vertex N-1, wherein vertex N-1 is a vertex calculated one iteration previous to vertex N; and, generating a clip code for the vertex N-1 . Then, the following steps are performed in a next iteration: performing a clip test on the set of clip coordinates for the vertex N; generating an estimate value of 1/w' for the vertex N; and computing a set of normalized device coordinates for the vertex N-1 utilizing a refined estimate value of 1/w' for the vertex N-1 and a set of clip coordinates for the vertex N-1. By so doing, perspective divide operations can be performed more efficiently.

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