Yep, they had a big one up when they shot obi-wan getting knocked down off the platform in Menace, where Maul kicks him off to separate Kenobi and Jinn. They shot it outside with a huge blue screen. The pod race scene had some two. Lots of movies do it. they were shooting Van Helsing across the street from my last job and they had a huge castle front set up, and a huge blue screen behind it, its actually cloth, they drapped it down the side of a lot of crates, like those metal crates you'd see at a port. They blue screened the guy's legs in Forrest Gump that was in a wheel chair so they could take them out later. They blue screen everywhere and anywhere.