AutoCAD 2008 User's
Guide > Control the Drawing
Views > Change
Views > Control the 3D
Projection Style >
Define a Perspective Projection (DVIEW)
Perspective projections require a distance between a theoretical camera and a target point. Small distances produce severe perspective effects; large distances produce milder effects.
A perspective view remains in effect until the perspective effect is turned off or until a new view is defined in its place.
