 Besides Weathertop, many of the other scenes in "The Lord of the Rings" trilogy were shot in this way, first by filming the scenery or set miniatures, then the actors on a studio set, and merging the two together.An example of this is in the Mines of Moria, when the Fellowship is fighting the cave troll in Balin's Tomb, and again when the Fellowship is on the Khazad-dûm stairs and bridge.Gandalf has his own particular scene with computer graphics as he grapples with the Balrog as they fall to their deaths.