", but how does a UI make the program?" If it wasn't for the UI, I'd already be using Lightwave, Cinema or True Space since they have more advanced features than Bryce. I've tried out a dozen other 3D programs so far, and compared to Bryce they all feel like a nightmare to use, even to accomplish the simplest tasks. When first starting out with a program It would take me a week or a month just to become 1% productive, where in Bryce I became nicely productive after 1 hour of use. Remember the famous words: "power and complexity are no excuse for an unfriendly user interface."

"An Example is worth Ten Thousand Words"