From:	Paul Furber <paul AT sprintlink DOT co DOT za>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Allegro perspective-correct texture mapping
Date:	Tue, 04 Mar 1997 23:50:02 +0200
Organization:	Global One South Africa (Pty) Ltd.
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References:	<5fg3s0$hob$1 AT troll DOT powertech DOT no>
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To:	djgpp AT delorie DOT com
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Ove Kaaven wrote:
> 1. Using POLYTYPE_PTEX, polygon3d_f bombs with SIGFPE when looking at
> my (vertical) wall at extremely small angles (wall and camera ray

Yup, had this too. Working on it.

> Are there plans to provide optimized routines for horizontal and
> vertical surfaces, or even better, the method described in zed3d
> (letting the logical scanlines you map onto be slanted themselves) to
> have a very fast perspective mapper?

Check out the PC Games Programming Encyclopaedia on
ftp://x2ftp.oulu.fi/pub/msdos/programming
There is a file called DOOM.TXT which describes several good fast
texture-mapping techniques. It might give you some ideas...

> 3. What should I give Shawn for his excellent library?

Definitely a copy of your hit game!

> 4. Where should I post this to keep it from being off-topic?

comp.os.msdos.djgpp.allegro.3d-questions ;-)


Paul.

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