From: "23yrold3yrold" <cbarry AT pangea DOT ca>
Newsgroups: comp.os.msdos.djgpp
Subject: 3D-boy is back!
Date: Sun, 10 Sep 2000 19:20:22 -0500
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hello! OK, I finally managed, after much effort, to get my polygon doin' its
thing onscreen.Now, a few more questions:

1. Exactly how do you use get_camera_matrix?

void get_camera_matrix(MATRIX *m, fixed x, y, z, xfront, yfront, zfront,
fixed xup, yup, zup, fov, aspect);

The first four and last two I understand, but the front's and up's don't
make any sense to me whatsoever. Are the 'in front' variables an angle or a
location in space? What is an 'up' direction vector? The Allegro docs are
very vague about this.... Also, does it matter in what order you apply this
matrix to an object? I assume one should do it last.

2. What is a good way of creating a 3D model outside of Allegro for use with
Allegro? I've heard 3d Studio Max is capable of this, but unless someone
here can lend me a few grand I'm hoping for another way.

I know not a whole lot of 3D chat goes on here, but I really could use an
Allegro-specific answer. I've been all over the net and get_camera_matrix's
uses seems pretty unique to Allegro. Thank you for your time.


Chris