<P> CAD software, and some computer games (especially games using 3 - D polygons) use linear algebra, and in particular matrix multiplication, to create a sense of perspective . The scene is a set of points, and these points are projected to a plane (computer screen) in front of the view point (the viewer's eye). The problem of perspective is simply finding the corresponding coordinates on the plane corresponding to the points in the scene . By the theories of linear algebra, a matrix multiplication directly computes the desired coordinates, thus bypassing any descriptive geometry theorems used in perspective drawing. . </P> <P> Of the many types of perspective drawings, the most common categorizations of artificial perspective are one -, two - and three - point . The names of these categories refer to the number of vanishing points in the perspective drawing . </P> <P> A drawing has one - point perspective when it contains only one vanishing point on the horizon line . This type of perspective is typically used for images of roads, railway tracks, hallways, or buildings viewed so that the front is directly facing the viewer . Any objects that are made up of lines either directly parallel with the viewer's line of sight or directly perpendicular (the railroad slats) can be represented with one - point perspective . These parallel lines converge at the vanishing point . </P> <P> One - point perspective exists when the picture plane is parallel to two axes of a rectilinear (or Cartesian) scene--a scene which is composed entirely of linear elements that intersect only at right angles . If one axis is parallel with the picture plane, then all elements are either parallel to the picture plane (either horizontally or vertically) or perpendicular to it . All elements that are parallel to the picture plane are drawn as parallel lines . All elements that are perpendicular to the picture plane converge at a single point (a vanishing point) on the horizon . </P>

Who is credited with formualting and writing down the first laws of linear perspective