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From: thant@horus.esd.sgi.com (Thant Tessman)
Newsgroups: comp.sys.sgi
Subject: Re: Replacing the perspective matrix.
Keywords: loadmatrix, perspective, viewing mode
Message-ID: <9514@odin.corp.sgi.com>
Date: 26 Jun 90 20:31:17 GMT
References: <696@celia.UUCP>
Sender: news@odin.corp.sgi.com
Reply-To: thant@horus.esd.sgi.com (Thant Tessman)
Organization: Silicon Graphics Inc.
Lines: 24

In article <696@celia.UUCP>, keith@celia.UUCP (Keith Goldfarb) writes:
> The perspective() call will load a matrix onto the transformation
> stack if in single matrix mode or replace the current projection
> matrix if in viewing mode.  The loadmatrix() call will load a
> matrix onto the transformation stack no matter what the mode.
> 
> What I want to do is to replace the current projection matrix
> (while in viewing mode) with one of my choosing with a call
> like loadmatrix().  Does such a call exist?

I don't think switching between MPROJECTION and MVIEWING changes
the values in the matrices.  (Only going into MSINGLE does that.)
So I think you can just say:

	mmode(MPROJECTION);
	loadmatrix(m);
	mmode(MVIEWING);

Not having actually done this myself, I don't guarantee
the validity of this information, but I think its right.

thant

"Ask not for whom the booth tolls..."