<P> Weta began animating Gollum in late 1998 to convince New Line they could achieve the effect . Andy Serkis "played" Gollum by providing his voice and movements on set, as well as performing within the motion capture suit later on . His scenes were filmed twice, with and without him . Originally, Gollum was set to solely be a CG character, but Jackson was so impressed by Serkis' audition tape that they used him on set as well . </P> <P> Gollum's CG model was also redesigned during 2001 when Serkis was cast as Sméagol, Gollum's former self, so as to give the impression Andy Serkis as Sméagol transforms into the CG Gollum . The original model can still be glimpsed briefly in the first film . Over Christmas 2001, the crew proceeded to reanimate all the previous shots accordingly within two months . Another problem was that the crew realised that the cast performed better in the takes which physically included Serkis . In the end, the CG Gollum was rotoscoped and animated on top of these scenes . </P> <P> Serkis' motion capture was generally used to animate Gollum's body, except for some difficult shots such as him crawling upside down . Gollum's face was animated manually, often using recordings of Serkis as a guide . Gino Acevedo supervised realistic skin tones, which took four hours per frame to render . </P> <P> While the novel alludes to a division within his mind, the film depicts him as having a split personality . The two personas--the childlike Smeágol and the evil Gollum--are established during a scene in which they argue over remaining loyal to Frodo . The two personalities talk to each other, as established by contrasting camera angles and by Serkis altering his voice and physicality for each persona . </P>

Where was the lord of the rings two towers filmed