what is image plane?
When it comes to the 3D computer graphics, the image plane is that plane in the world which is identified with the plane of the display monitor used to view the image being rendered. Also often referred to as a screen space. If you make an analogy of taking a photograph to render a 3D image, the surface of the film is the image plane. In the case of this, the viewing transformation is a projection that will map the world into the image plane. A rectangular region of this plane called the viewing window or viewport, maps to the monitor. This builds the mapping between pixels on the monitor and points in the 3D world. The plane is not usually an original geometric object in a 3D scene, but rather is a general collection of target coordinates or dimensions that are used during the rasterization process so the final output can be displayed as intended on the physical screen. When it comes to optics, the image plane is the plane that contains the object’s projected image and lies beyond the back focal plane.