xStream is just Vue 6 Infinite + plugins for other 3D packages. It will render your vue scene as a background and composite your other 3D package's elements into the render. That being said, it doesn't work quite right at this time. And if you think Vue 6 Infinite has problems (memory, etc.) just wait until you try to use xStream...

At least version 6 is sorta usable (I use it with 3ds max/mental ray). Version 5 was totally unusable.