   world co-ordinates to screen co-ordinates
  Does anyone know how to convert a point in 3d world co-ordinates to 2d screen co-ordinates? I am working with a system where I do not have access to the projection matrix. I only have the view matrix and distance from the camera to the viewing plane.Any help would be greatly appeciated   
  You can't determine the screen-space coordinate without the projection matrix or the parameters used to create the projection matrix.   ;  Are you sure? I would have thought the view matrix and focal length would be enough.;  I found some more information about this in a book. I think if I multiply by the inverse of the view matrix and then use this formula, it will do the trick:yScreen = -focalLen/zWorld*yWorldxScreen = -focalLen/zWorld*xWorldbut I'm just guessing.   