1. A method of computer-generated animation, the method comprising: identifying a first segment of an animated scene to be rendered; receiving a plurality of configurations of a render camera during the first segment, each configuration occurring at a different point in time during the first segment, wherein the configurations of the render camera determine one or more objects seen in images of the first segment of the animated scene; and rendering the first segment of the animated scene using the render camera and a grid camera, the grid camera being configured based on the configurations of the render camera and being used to determine a resolution of a grid of each of the one or more objects seen by the render camera, wherein the rendering of the first segment of the animated scene comprises: determining a first amount based on a change in the configurations of the render camera between different points in time during the first segment; comparing the first amount to a threshold; when the first amount is within the threshold: determining one or more configurations of the grid camera during the first segment based on the configurations of the render camera, the one or more configurations of the grid camera differing from the configurations of the render camera; determining one or more first grids for rendering the first segment based on the one or more configurations of the grid camera; and rendering the first segment of the animated scene based on the one or more objects viewable from a point of view of the render camera in images of the first segment and using the one or more first grids determined using the one or more configurations of the grid camera during the first segment; when the first amount is outside the threshold: determining one or more second grids based on the plurality of configurations of the render camera during the first segment; and using the one or more second grids in rendering the one or more objects during the first segment, wherein the method is performed by a computer system.