Hybrid image rendering system

A first computing device determines a scene graph that is representative of a three-dimensional scene that includes objects to be viewed from a specified virtual camera location. The scene graph is processed locally by the first computing device to generate a raster image. The scene graph is sent to a second computing device, such as a server, that processes the scene graph and generates illumination data. The illumination data may be indicative of brightness value for a given pixel that is representative of optical effects such as reflection, refraction, and so forth. The illumination data is received by the first computing device. The first computing device combines the raster image and the illumination data to produce an output image. The output image may then be presented using a display device.