I tried just about everything to use volume object for animation. At the moment they work great as, well, cloud objects that stand apart. Any boolean operation will render badly. A real downner is also that you can use only the basic Bryce primitives: ball, rectange etc. with volume objects. If you use an imported object volumes just won't render correctly. This all applies to animation. In single picture you can probably make work arounds. What I'd like to know are these fixed in up-coming Bryce 5 do I have to switch