 Other tools designed to help artists complete complicated effects included Spaces, which allowed Olaf's deconstructible parts to be moved around and rebuilt, Flourish, which allowed extra movement such as leaves and twigs to be art-directed; Snow Batcher, which helped preview the final look of the snow, especially when characters were interacting with an area of snow by walking through a volume, and Tonic, which enabled artists to sculpt their characters' hair as procedural volumes. Tonic also aided in animating fur and hair elements such as Elsa's hair, which contains 420,000 computer-generated strands, while the average number for a real human being is only 100,000. The number of character rigs in Frozen is 312 and the number of simulated costumes also reached 245 cloth rigs, which were far beyond all other Disney films to date. Fifty effects artists and lighting artists worked together on the technology to create "one single shot" in which Elsa builds her ice palace. Its complexity required 30 hours to render each frame, with 4,000 computers rendering one frame at a time.
