Hi. Could someone please explain this? I'm trying to figure out what glOrtho(0.0, 1.0, 0.1, 1.0, -1.0, 1.0); does exactly, on a not so technical level. I'm testing the http://www.opengl.org/resources/code...edbook/hello.c code. It just doesn't do what I expected it to do when I changed the left/right/bottom/top parameters. Why do the clipping planes seem to expand from the square, and why is that extra space white?