How Does Hollywood Achieve Those Special Effects?

Harry Potter and the Half-Blood Prince

Back to Hogwarts now for a look at Daniel Radcliffe shooting one of his famous Quidditch scenes. Here is another example of how almost every aspect of the scene is built in a Hollywood studio somewhere.

@BehindScenesPic/Twitter

Filmmakers placed Radcliffe on a real broom and propelled him up a few feet in the air. However, aside from that most of it is all CGI generated. Shame, we would love to play Quidditch if we could!