There are no built-in commands that automatically perform edge blending, but it is definitely possible to add this functionality yourself. The following page describes a simple technique for performing edge blending,
http://ozviz.wasp.uwa.edu.au/~pbourk...our/edgeblend/. This would not be too difficult to implement in Vizard. There are also some commercial tools available that will automatically perform edge blending for you. You might want to look into these as well.