I am pretty sure that the pros render in layers and then composite the layers in the final mix. this avoids a lot of needless rerendering extraneous elements. unfortunately to do this inside Bryce is not presently possible. in order to layer your animations, you need to map your texture onto a simple 3-D plane with your poser.avi and and a transparency mask. neither Bryce or poser allows mapping avi's onto objects. I have made this suggestion to Eric Wegner, the author of Bryce, but never heard anything back. your alternatives are either an editing program like Premiere, or Vue3 is supposed to allow mapping avi's onto objects. doing your imaginative worlds idea would be very complex. the only "easy" application that does what you want is called Nemo. http://www.nemo.com/ it costs $1000, which is cheap for everything you're trying to do. You're ahead of the technology by a few years.