The integration of Animator with Vray is not really official. Animator uses an API to render with VRay which I don't know if it officially supported. And VRay did not make the reverse integration where they import an Animtor animation and process it in batch (as available in Thea).
Anyway, I don't know what is VRay Swarm and if there is no API, then I am afraid it cannot be supported.
Fredo
