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In 3D computer graphics, the 'image plane' is that plane in the world which is identified with the plane of the monitor. If one makes the analogy of taking a photograph to rendering a 3D image, the surface of the film is the image plane. In this case, the viewing transformation is a projection that maps the world onto the image plane. A rectangular region of this plane, called the 'viewing window' or 'viewport', maps to the monitor. This establishes the mapping between pixels on the monitor and points (or rather, rays) in the 3D world.