Hi, I'm new to OpenGL, I wrote a simple square that is supposed to start at (0.0, 0.0) but it appears like this when I run: | |.......... _____________ |..........|....................| |..........|....................| |..........|....................| |..........|....................| |..........|____________.| | |__________________________ (It looked better in the editor) The point is that it starts like at (10, 10) -or (1, 1), I'm really new to this-. ...Here's the code: - (void) drawRect: (NSRect) bounds { glClearColor (1, 1, 1, 0); glClear (GL_COLOR_BUFFER_BIT); glBegin (GL_POLYGON); glColor3f (0.0, 0.0, 1.0); glVertex2f (0.0, 0.0); glColor3f (0.0, 1.0, 0.0); glVertex2f (0.0, 2.0); glColor3f (0.0, 1.0, 1.0); glVertex2f (2.0, 2.0); glColor3f (1.0, 0.0, 0.0); glVertex2f (2.0, 0.0); glEnd (); glFlush (); } By the way I'm using Xcode and Interface Builder.

How did you setup your projection? If it's perspective, (0,0,0) is actually at the middle of the viewport (window). If it's orthographic, then it depends on the parameters passed.

Anyway, a screenshot could be useful.

I think ToohrVyk is right. How can I set it to ortho?

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 1, 0, 1, -1, 1);
glMatrixMode(GL_MODELVIEW);


That would make (0,0) bottom-left and (1,1) top-right.