Attached Link: http://www.egrafx-design.com/3dmovies.html

perhaps if carrara is like raydream studio you can import poser scenes. the only other software i know of that can import poser scenes are 3d studio max and lightwave. as far as bryce goes I've tried and failed. Try a video compositing program like after effects, premiere, or strata videoshop and layer your files. I have included a link of some compiled movies i've made with after effects hope this helps eric