[PyOpenGL-Users] orthographic projection error

[altern <al...@gm...>]

hi

i am using glOrtho to create a 2D projection where I map the opengl 
units to pixels. The problem comes when running the same example in 
different systems and machines I get one pixel difference between 
systems. The example draws a one pixel wide box in the borders of the 
window. In none of the sytems I tried so far the box was totally 
visible. There is always one or two sides missing just by one pixel.

I guess this has to do with the way graphics cards decide to render the 
opengl units into pixels in the screen. I tested on same Debian in two 
different machines and i get different results.

Also I guess there is no much i can do about this. But maybe I am 
missing something. I setup glOrtho like this
glOrtho(0, 800,  600, 0, 1, 0)

I am using pygame to open the window.

thanks

enrike