Tracy- Yon can round off corners, were the mesh has an edge in Bryce, is that what you want to do? You have to go in the the Edit window (the "E" on the little inital menu alongside the object) and select the angle below where all corners of that angle or less are rounded off, and click on the smooth sphere on the left, click on the faceted sphere on the right to reverse the process. How this interacts with the "smooth" attribute a object can have I have no idea, in 3DS Max you have two levels of smoothing, one just sets the attribute, the other adds vertices to the mesh to smooth it.