Its not quite that simple ....
Unless you got some crazy mad steeze out of no where, its mostly about networking and making your self know.
Comps put you on the radar and get ur name out there. But directors and producers and skiers and other industry dudes all have a say ... each film / production house is different as well.
better off playing the lottery, its way more likely that you will win and you dont have beat your self up for peanuts and ski for douche bags .. oh, and when you are a millionaire, you can decide who goes in the movie!
JoeStrummer-"No avy training but I've watched K2 so many times I think I know what to look for."