Function that removes the distortion that appears when a texture map is applied to a polygon in space. By using a computational intensive method, this particular way of doing texture mapping increases the realism of an image. Perspective Correction takes into account the depth of a scene while rendering texels onto the surface of polygons. This provides the appearance that objects near the viewer are larger and objects that are further appear smaller. In addition, this allows parallel lines such as railroad tracks converge in the far distance.