In this mode, the textures are applied taking care of the perspective variations from the observer point of view.
The technique of applying a texture map to a polygon that is angled away from the camera, interpolating so that the texture is stretched onto the polygon appropriately for the apparent depth of the polygon. Direct3D supplies perspective correction automatically.
Adjusting textures so that they converge correctly with distance, giving them a more realistic appearance when viewed from various angles.
Textures are adjusted so that they correctly map polygons along the depth axis. Because object's will get smaller the further away from the view they are, the texture's dimensions also have to be changed.
This correctly alters the textures in a scene to give a sense that all the images on the screen converge on one central point way out in the distance....
Adjustment of texture maps on objects, viewed at an angle (typically large, flat objects) in order to retain the appearance of perspective.