Yes, Bryce can do realistic clouds and quite frankly, better than terragen. There's a couple of guys over at 3dcommune that have put out some tuts on that. http://www.pinhead.robbes.com/tutorial/Skyfx/sfx_intro.html http://www.pinhead.robbes.com/tutorial/B5skylat/B5skylat.html http://home.attbi.com/~paulvlos/Cloud_Tut/Combinationsky1.htm http://home.attbi.com/~paulvlos/Cloud_Tut/Part2/Sky_Part_2.html