Exactly, Bryce cannot truly edit its primitives polygons, so smoothing edges can't be done like you would in a traditional modeler. As electroglyph says, you'll have to use the rounded cube that comes with Bryce, or use terrains. ;o AS

Contact Me | Gallery | Freestuff | IMDB Credits | Personal Site
"I want to be what I was when I wanted to be what I am now"