   Window bounds
  Hi,I want to set up bound limits so that my objects bounce off the edges of the screen.  You might be thinking to yourself, "how innovative!"  lol.  My question:  is screen resolution a factor in bound limits?I tried doing some trig on the near-plane/far-plane with the angle of projection to determine the total viewing area, but the numbers didn't match up with the coordinates of my bouncing balls.If someone could help me out I'd certainly appreciate it!   
  i think that frustum doesn`t depend on resolution in any way. field-of-view angle, and screen ratio, then far and near plane should be enough, i guess.   