Coordinate System

Hi!

I am a very beginner in programming OpenGL applications.
The problem is that how to change the default coordinate system. The default is
(-1,1;1,-1) as I suppose.
But I want
(-8;8;8;-8).
How to change the default coordinate system?

And one more thing: why can't I use glVertex2d function? glVertex3f and glVertex2i functions work just fine. Maybe you know where is the trick.

Thanks, bye!

[nexusone]

Do you mean the window corrdinates?
You set that when setting the viewing area.
glViewport() and glortho2d().


The vertex qestion:
glvertex2f has to be a float (0.0, -1.0, 1.0)
glvertex2i has to be an int(0,1, 5, 100)
glvertex2d has to be a double.

When you use the glvertex2d do you use a variable that is a double?

Originally posted by Anvar:
Hi!

I am a very beginner in programming OpenGL applications.
The problem is that how to change the default coordinate system. The default is
(-1,1;1,-1) as I suppose.
But I want
(-8;8;8;-8).
How to change the default coordinate system?

And one more thing: why can't I use glVertex2d function? glVertex3f and glVertex2i functions work just fine. Maybe you know where is the trick.

Thanks, bye!