The art and mathematics of realistically representing three dimensions in a 2-dimensional diagram. Straight lines in space appear as straight in the image. Lines which are parallel to the image plane appear as parallel in the image. Other parallel lines in space meet at a vanishing point, and each new direction will require a separate vanishing point. See diagram for an example with two vanishing points. See also points at infinity, projective geometry.

Parallel edges meeting at vanishing points