The visual effects were primarily provided by Weta Digital. Effects supervisor Erik Winquist and a small crew travelled to Chicago to create a model of the Chicago Loop that would be destroyed in the climactic battle, learning the building materials and architecture styles. Up to 15,000 photographs were taken with 3D scanners, while motion cameras covered downtown Chicago. As reference for the building destruction, the artists studied both the World Trade Center attacks and implosions of buildings affected by the 2016 Kaikoura earthquake in Weta's hometown of Wellington. One of the more challenging aspects for Weta was figuring out how the weight and mass of the monsters would affect the city environment and destruction. Given Weta had plenty of experience creating animated apes in King Kong and Rise of the Planet of the Apes and its sequels Dawn and War, it helped the studio create George "in a much shorter time than it may have 10 years ago," according to Winquist. Motion capture coach Terry Notary even took a break from Avengers: Infinity War, which was also filmed in Atlanta, to help Jason Liles in his performance as George. On the other hand, the lack of motion capture for Ralph and Lizzie let the animators go loose with how these monsters were portrayed, such as "a wolf that has porcupine spines and wings". Other VFX companies like Hydraulx, Scanline VFX and UPP contributed to the film

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