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 LWJGL Object Coordinates  (Read 1699 times) 0 Members and 1 Guest are viewing this topic.
lethalwire

Senior Newbie

 « Posted 2012-04-24 03:09:02 »

I'm trying to get the object coordinates of objects I'm drawing in 3D space.
I've read that the GL_MODELVIEW_MATRIX is the comprised of the GL_PROJECTION_MATRIX and the transformation_matrix(which isn't defined for lwjgl).

So, are the object coordinates simply in the matrix:
transformation_matrix = GL_PROJECTION_MATRIX * inverse(GL_MODELVIEW_MATRIX);

Also...
If I'm letting the user move the camera around freely in the 3D space, do I have to add anything to the computation when I'm solving for the transformation_matrix?

I've already read that this ISN'T the way it should be done, and that I should be keeping track of any x,y and z coordinates myself. (As this isn't what OpenGL was meant for)
In that case, what method would I use to keep track of x,y and z coordinates if I'm consistently doing something similar to:

glTranslatef(x, y, z);
glRotatef(degree, 0, 1, 0); //Where there could, or could NOT be a rotation
glRotatef(degree, 1, 0, 0);//Where there could, or could NOT be a rotation
glTranslatef(x, y, z);
...
etc.
lethalwire

Senior Newbie

 « Reply #1 - Posted 2012-04-24 06:39:23 »

I think I might've figured it out...

=)
* lethalwire puts away the coffee.
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