Message-ID: <386717B0.EF1E4F98@ozemail.com.au>
From: QarnoS <qarnos AT ozemail DOT com DOT au>
Organization: Anti-Conservation Foundation of Australia
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Newsgroups: comp.os.msdos.djgpp
Subject: Request for help with camera matrix.
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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

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