John,
Sorry for not replying earlier, but I've just got off a long job for the BBC that followed NAB.
http://peterwiggins.com/content/view/31/33/
Yes you can use Volumetrix with MultiSpace, but the rays will only be on a flat plane. Even in Motion3 there is no way to get 3D rays.
BTW Volumetrix & the other NI filters work fine with FCS2
Peter