Tony Smeed is the film 's head of animation .
`` According to the film 's head of animation , Tony Smeed , the Earth Giants `` '' had a long rigging process '' '' in order for the characters to move without `` '' [ seeing ] solid rock penetrating solid rock '' '' , while Marlon West , the film 's head of effects animation , said that the film 's effects team had the objective of generating `` '' rocks that would fall out of the joints as they moved '' '' , though they had to be careful to avoid making the rocks distracting to the audience . ''
Frozen II