Flash would allow you to add the interactivity you describe, but doesn't do 3D nativly. I agree about using Carrara as an in-expensive, but highly capable program for doing what you describe and Carrara has a plug-in that allows for outputing to Flash, and then you could add the interactivity. But look-out for a steep learning curve with Flash! Some things are easy, and others are a LOT more difficult then they should be! What is your final output? CD-ROM, Web, a video project? 3D gets pretty big for the web, but can fit onto CD-ROM very easily, and with high frame rates for better quality. Hope this helps! :>