Unix Programming - OpenGL question

Author

OpenGL question

Bin Chen

2008-01-20, 4:28 am

Hello,

Many operations of opengl is multiply the current matrix with a
provided matrix. But what is the current matrix for?

Thanks.
Bin

Rui Maciel

2008-01-20, 8:12 am

Bin Chen wrote:

> Many operations of opengl is multiply the current matrix with a
> provided matrix. But what is the current matrix for?

It's for the linear transformation of any given vector.

Rui Maciel

John Tsiombikas

2008-01-20, 7:16 pm

On 2008-01-20, Bin Chen <binary.chen@gmail.com> wrote:
>
> Many operations of opengl is multiply the current matrix with a
> provided matrix. But what is the current matrix for?

I suggest you do some reading on computer graphics, before trying to use
OpenGL.

OpenGL works as a typical rendering pipeline. Vertices are fed to it in
model space (say a coordinate system somewhere about the center of each
object) and then, they are sucessively transformed through a number of
coordinate systems, in order to be finally projected to the 2D view
plane and drawn on the screen. A 4x4 matrix is needed for each such
transformation, which you can manipulate with the OpenGL matrix
functions.

This is not the best newsgroup for OpenGL discussions. OpenGL was born
on UNIX systems, but it's a cross-platform API, and there is a special
newsgroup for it: comp.graphics.api.opengl. Post any other questions
you may have, there.

--
John Tsiombikas (Nuclear / Mindlapse)
http://nuclear.sdf-eu.org/

Jignesh

2008-01-24, 8:19 am

On Jan 20, 8:51 pm, John Tsiombikas <nucl...@siggraph.org> wrote:
> This is not the best newsgroup for OpenGL discussions. OpenGL was born
> on UNIX systems, but it's a cross-platform API, and there is a special
> newsgroup for it: comp.graphics.api.opengl. Post any other questions
> you may have, there.
>
> --
> John Tsiombikas (Nuclear / Mindlapse)http://nuclear.sdf-eu.org/

Thanks for the group name. Do you know any more such group/forums for
OpenGL on UNIX/Linux?

Jigslinx

John Tsiombikas

2008-01-25, 4:34 am

On 2008-01-24, Jignesh <jgangani@gmail.com> wrote:
>
> On Jan 20, 8:51 pm, John Tsiombikas <nucl...@siggraph.org> wrote:
>
> Thanks for the group name. Do you know any more such group/forums for
> OpenGL on UNIX/Linux?

No, I don't know any OpenGL newsgroups specialized on using OpenGL on
UNIX, however comp.graphics.api.opengl has a lot of traffic and many
UNIX users. So it shouldn't be a problem.

--
John Tsiombikas (Nuclear / Mindlapse)
http://nuclear.sdf-eu.org/

Sponsored Links