I want to know if i can mix glPerspective and glOrtho in my program. ie, i need draw four pictures
on the four corners of my client area and a ball in the middle, the ball must rotate repeatedly.
if i only use glOrtho and the pixel space, the ball cannt work(i am not sure about this, can anybody
tell me if i was right?), because it has a depth(z) component. so i want to do the following: