(Since this part might be a little off-topic due to describing the off-line version of some of the things that go on in film-making I'll just put this into a spoiler-tag for now) For those who've never been part of any «movie-shoots» before, well, I guess I'll just briefly describe it as everyone gets together at scheduled times (actors/actresses all show up but of course the Director & Cameraman [who is also often simultaneously the film-editor] are doing the most amount of work in organising & co-ordinating everyone [extras aren't always used but are still requested to show up anyway]). For «indie» films the director may not necessarily have the $$$ to pay everyone but when I was assisting with one in the past as an extra the Director always provided us food to eat & I had quite the appetite so of course I'm going to go where there was food, but, anyway, royalties & stuff only really come about if the film becomes a huge financial-success (rare unless you have some big-time connections; but it should also be cautioned that these conditions can cause the industry itself to be rife with potential fraud & false promises so make sure to thoroughly do your research on any particular director and/or agency before risking learning more about anything too shady the hard way).