   Coordinates
  I was searching around google on this and found a few things but i never found out what i wanted to know.  What does like 1 pixel equal to in the opengl coordinate system.  I am trying to do a 2d game and i want like a quad to be like 64x64 pixels and i dont know what that is in opengl.  any suggestions ? 
  That depends entirely on how you set up the projection and transformation matrices. For example, with an orthographic projection matrix you can easily archieve 1 OpenGL unit = 1 pixel. ;  well i am using glortho and i know it can be done but i dont know how.  thats my problem. ;  glOrtho(0, screenWidth, screenHeight, 0, -1, +1)You might have to experiment a bit with the sequence of parameters to get the origin (here the origin is in the top left)of the coordinate  system you want, but that's it basically.Edit: Switched near and far clipping plane.   [edited by - BitMaster on February 6, 2004 12:37:28 PM];  hey thanks alot bitmaster,  that was it, i switched around my glortho paraemeters.  now it works. 