   Transformation From Ortho to Perspective
  I was wondering if someone knew how can i take a OrthoView Transformation and convert that to Perspective. For Example let's say i have Ortho View Set up and then i click somewhere on the screen, for example let's say (100,100) then i want to take that coord and convert it to Perspective View Coord that represent the same location on the Perspective View. So if Anyone can help me that would be cool. By the way this is For DirectX.   