What render passes do I need to have full controlover the look of smoke in post?

Oct 12

What render passes do I need to have full controlover the look of smoke in post?

Hi im trying to figure out what passes I need to render out of my 3d app to create and composite realistic smoke into a rendered animation im making. Im not thinking of the basic beauty and alpha channel, im thinking passes that will give me full control over the look of the smoke in post. I have been watching some Digital domain VFX breakdowns and it seems they are rendering out what looks like RGB passes, motion vectors and probably many more advanced data type passes to give the compostiers full control over the look of the smoke in there compositing app.
When looking at various VFX breakdowns it seems that hardly any FX passes have beauty type renders, is this observation true? are most FX passes mainly data based? It would be great to get some feedback on this..

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Hasta La Motion!