Pre-computed shadow fields are described. In one aspect, shadow fields for
multiple entities are pre-computed. The shadow fields are pre-computed
independent of scene configuration. The multiple entities include at
least one occluding object and at least one light source. A pre-computed
shadow field for a light source indicates radiance from the light source.
A pre-computed shadow field for an occluding object indicates occlusion
of radiance from the at least one light source.