There is no way to create perfect or realistic shadows in AutoCAD but there are various options that can be used to create approximate shadow effects. The choice of shadow will often depend upon the object casting the shadow. For example, there is no difference between volumetric and raytraced shadows as cast by solid opaque objects. However, there is a difference between the two shadow types when cast by a transparent or translucent solid object. Volumetric and raytraced shadows give the best definition and are easier and more reliable to work with but they don't have the soft edges that many real shadows have. Shadow maps do have soft edges but they are difficult to control (there is no real-time preview) and they don't give particularly realistic results.
