Message-ID:	<386717B0.EF1E4F98@ozemail.com.au>
From:	QarnoS <qarnos AT ozemail DOT com DOT au>
Organization:	Anti-Conservation Foundation of Australia
X-Mailer:	Mozilla 4.7 [en] (Win98; I)
X-Accept-Language:	en
MIME-Version:	1.0
Newsgroups:	comp.os.msdos.djgpp
Subject:	Request for help with camera matrix.
Lines:	43
NNTP-Posting-Host:	slmlb31p01.ozemail.com.au
X-Trace:	ozemail.com.au 946280191 210.84.136.129 (Mon, 27 Dec 1999 18:36:31 EST)
NNTP-Posting-Date:	Mon, 27 Dec 1999 18:36:31 EST
Distribution:	world
Date:	Mon, 27 Dec 1999 18:39:28 +1100
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Hi, folks!

I'm currently making a simple C++ 3d engine using Allegros 3D functions
as a core, and have struck a problem which I'm hoping someone on this
group can help me with.

The engine itself runs perfectly; there is no problem with rendering of
3d objects, my problem is with camera movement, or more specifially,
camera movement & rotation relative to it's current position and
direction.

I have created a C++ camera class, which controls every aspect of the
camera. I have functions for *absolute* positioning and rotation of the
camera, but also need functions for relative movements.

These are the methods I'm trying to create:

camera:: adjust_position(float forward, float right, float up);
camera:: adjust_rotation(float xrot, float yrot, float zrot);

What I need to know is, how do I Make relative movements & rotations of
the camera, taking into account the current horizontal and vertical
planes of the camera (ie: The front & up vectors)? I have an inkling I'm
going to need to use an alignment matrix, but I just can't get it to
work properly.

I have tried to be as clear as possible, but if further clarification if
require, please ask me!

Thanks in advance for any help.

-- QarnoS

{ Insert witty comment here }

-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GO d- s:+ a--- c++(++++) UL P+ L+ E W+++ N++ o--
K---- w-- O? M-- V? PS PE Y-- PGP- t+(+++)
5-- X+(++) R* tv b DI-- D+ G-(--) e(*) h! !r(---) m
------END GEEK CODE BLOCK------

- Raw text -