So I've taken to Rhino as my modeler of choice, but I'm still so new to it that I'm afraid these vases/jars are the pinnacle of my capabilities! I know that Bryce doesn't support NURBS, and that it's all polygons when you import objects into Bryce. Still, I'm excited because these vases actually have an inside AND an outside! No guesswork involved, just math. Here's a quick render I did to test some lighting and materials on these simple objects... Note that none of these objects have been "smoothed", so far...