Thread: OpenGL - screen dimensions

Hello,

I am new to using OpenGL and I have many questions, but the one that has been bothering most is this one:

Why is it that if I draw a glVertix2d, for example, and the parameters i called it with are '0.1, 0.1' it appears in the center of the window, which coords are 250, 250. Should it not appear in the top left of the window, since 0.0 is the top left of the Frame?

In OpenGL by default (0,0) is in the center of the window.

Originally Posted by tabstop

In OpenGL by default (0,0) is in the center of the window.

is there someway i can change that so it is aligned to windows' pixels?

I suppose glTranslate would do what you want. You might need to scale, too, depending on how you set up gluPerspective.

Originally Posted by tabstop

I suppose glTranslate would do what you want. You might need to scale, too, depending on how you set up gluPerspective.

good idea! thanks!