Pyramid of vision
Encyclopedia
Pyramid of vision is a 3D computer graphics
3D computer graphics
3D computer graphics are graphics that use a three-dimensional representation of geometric data that is stored in the computer for the purposes of performing calculations and rendering 2D images...

 term: the infinite pyramid
Pyramid
A pyramid is a structure whose outer surfaces are triangular and converge at a single point. The base of a pyramid can be trilateral, quadrilateral, or any polygon shape, meaning that a pyramid has at least three triangular surfaces...

 into the real world, with an apex at the observer's eye and faces passing through the edges of the viewport
Viewport
A viewport is a rectangular viewing region in computer graphics, or a term used for optical components. It has several definitions in different contexts:- Computing :...

("window").
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