1. A method, comprising: performing, by one or more computing devices: rendering an image at a first resolution, wherein: a computer-generated three-dimensional (3D) model is rendered as one layer of a plurality of layers of the image, the one layer being rendered by dividing the one layer into a plurality of image tiles; and a different layer of the plurality of layers includes two-dimensional (2D) artwork for the image separate from the 3D model, the different layer being rendered by dividing the different layer into a different plurality of image tiles; in response to a manipulation of the 3D model, switching from rendering the one layer for the 3D model at the first resolution and as a plurality of image tiles, to rendering the one layer for the 3D model at a second resolution that is lower than the first resolution and as a single image tile, while continuing to render the different layer as being divided into the different plurality of image tiles; and subsequent to the manipulation of the 3D model, rendering the one layer for the 3D model at the first resolution as a plurality of image tiles.