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Gets a two dimensional point=> (x,y) is a point in the rendered window
Usually we get this point from events like OnLButtonDown()
The function calculates the corresponding three dimensional point
in the world and sets the camera to point towards this point.
If there is no corresponding 3D point then it returns VR_ERROR
(happens when we point to an empty place in the rendered image.
see also STATE_camera_point_at() and STATE_engine_2D_point_to_3D();
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