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Perspective projection
From Wikipedia, the free encyclopedia
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Perspective projection is a type of drawing, or rendering, that graphically approximates on a planar (two-dimensional) surface (e.g. paper or painting canvas) the images of three-dimensional objects so as to approximate actual visual perception. It is sometimes also called perspective view or perspective drawing or simply perspective. A perspective projection drawing must be made according to an established geometric protocol.
See linear perspective for a discussion of one-point, two-point and three-point perspectives.
All perspectives on a planar surface have some degree of distortion, similar to the distortion created when portraying the earth's surface on a planar map. See perspective projection distortion for a discussion.
A photograph automatically shows a scene with correct perspective for the location of the camera. It follows that an artist wishing to paint a picture of the scene with true perspective needs only to draw an accurate copy of the photograph. If his painting is to be of a different size from that of the photograph he must accurately scale it up or down. This may easily be done by using a proportional divider, sometimes called a Variscaler, set to give the scaling ratio which is required to fit the scene on to his painting support.
The following terms are basic to understanding the drawing protocols of a perspective projection.