From:	tlenatNOSPAM AT flashnet DOT it (Tiziano Lena)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Allegro - Triangle bug?
Date:	Thu, 21 May 1998 19:19:20 GMT
Organization:	Customer of Flashnet S.p.A. - http://www.flashnet.it
Lines:	13
Message-ID:	<35647cb2.1141003@news.flashnet.it>
References:	<35633112 DOT 3679877 AT news DOT flashnet DOT it> <35634467 DOT 7A3 AT cam DOT org>
NNTP-Posting-Host:	ip026.pool-01.flashnet.it
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

>> Hi!
>> Has the triangle(...) call any known bug?
>> I ported my Djgpp 3d engine to Djgpp+Allegro (3.0 + WIP) and the
>> program sometimes crashes (SIGFPE) when I am close to objects.
>> In gdb I made a disassemb <eip> and saw that it points to the triangle
>> routine...
>
>are you doing any clipping? Are any of the Z coords negative, or very
>close to 0? You should clip to a Z=1 plane before drawing.

I use the Sutherland algo for clipping to a z-near plane.
I tested the clipping with my old polyfillers and it seems to work...
But maybe there is a bug somewhere else... :-(

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