I suggest using Rhino more often. That is ultimately going to be what will reinforce it upon your memory like Bryce is. That is the way that uv mapping is too. Of course it is more work than Bryce because alot of Bryce has become second nature by now to us and picking up and trying to learn our way around a new technique in a new program is quite tedious in comparison. I ran across this when building my website. I had my choice of learning html or learning dreamweaver3 and chose dreamweaver3. It took a few days before my site started taking shape because I had to learn my way around the program. Any way stick to Rhino and you will learn it. Hang around the Rhino forum too.