Special effects of The Lord of the Rings film series Later on, the scenes were merged using digital effects. 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 was fighting the Cave-troll in Balin's Tomb, and again when the Fellowship is on the Khazad-Dum stairs and bridge. Gandalf has his own particular scene with computer graphics as he grapples with the Balrog as they fall to their
The Lord of the Rings Motion Picture Trilogy: The Exhibition to have more realistic size, proportions, and shapes. For some scenes, such as the crossing of the Bridge of Khazad-dûm as it collapses, the entire cast was replaced for a few seconds by digital doubles; the laser scanning technology helped make these doubles look like the real characters/actors. Also, a motion capture demonstration was created by the HITLabNZ, in which visitors wielding colored foam weapons could move against a green screen and watch an Orc, Elf, or Gondorian Soldier move the same way they did. In the making of the films, especially for the motion capture process that yielded Gollum,