Well, there was nothing in the film about it - so nothing, you redo things. Just like you do in Rhino. BTW, I had mentioned the possibility of the dynamic parametric modelling to the Rhino people, for their version 4 and it appears it's much harder to do than the ordinary modelling. And Rhino is much more advanced modeller than Bryce... OTOH, Cinema has it. Until you fix things in a mesh. So Bryce 6 seems to be closer to Cinema than to Rhino.

-- erlik