Re: Well, reshoot or...

Having spent my professional career "fixing it in post", there's a lot more options that you think...are you in a position to hire this out, or do YOU Have to fix it? What kind of budget do you have?

I can think of several ways to do this:

1) Discreet, er Autodesk Combustion is designed for this kind of work. It doesn't have the rotoscoping splines of Commotion or Curious gFx, but the keying and particle effects included in the application are the best for this sort of work!

2) After Effects - using a lot less intuitive masks, you can probably roto out what you need to, or use a combination of matte-generating plugins from Digital Film Tools Composite Suite
(http://www.digitalfilmtools.com/cs-3/cs.htm)
to cut things out, and then add snow using Digieffects Delirium
(http://www.digieffects.com/products.shtml#DELIRIUM)
or AE's particle system.

Either way, all you need is a clean plate of the scene without the talent or the smoke. The easiest way to do this is to grab 3-6 frames of the scene, and use Photoshop to cut and paste a full clean plate. Then, after you've editied the shot, compare where the talent moves, and where the smoke is. Do a roto or key of the talent over the still clean plate - with a little practice, you can generate a composite that no one will notice the dif! One solution the client doesn't have to know is you can pile up the snow over the areas that are an iffy composite, hiding any defects you might generate doing the composite.

Dan Warvi
After Effects, Avid, Curious gFx, Broadcast Systems & PC as nec