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From: andreess@mrlaxs.mrl.uiuc.edu (Marc Andreessen)
Newsgroups: comp.sys.sgi
Subject: Re: GL error.  What does it mean?
Message-ID: <1991Jan30.210721.13149@ux1.cso.uiuc.edu>
Date: 30 Jan 91 21:07:21 GMT
References: <1991Jan30.161544.7845@ux1.cso.uiuc.edu>
Sender: news@ux1.cso.uiuc.edu (News)
Organization: University of Illinois, Urbana
Lines: 18

In article <1991Jan30.161544.7845@ux1.cso.uiuc.edu> marcc@yoyodyne.ncsa.uiuc.edu (Marc Cooper) writes:
>I'm getting the following error from my program, which continues to run,
>but doesn't perform as expected..
>
>ERROR #1  gl_invert4d :  ERR_SINGMATRIX

One generally sure way of getting errors like this is scaling some
dimension to 0... which is easy to do accidentally - i.e. doing
scale( 0., 0., z_factor ) instead of scale( 1., 1., z_factor ).

Check all transformations several times over - it's probably a source code
bug.

Marc

--
Marc Andreessen___________University of Illinois Materials Research Laboratory
Internet: andreessen@uimrl7.mrl.uiuc.edu____________Bitnet: andreessen@uiucmrl