A method and a system for rendering a 3D scene are disclosed. A set of parameters for objects in the 3D scene are identified. The objects are grouped based on the identified set of parameters and spatial boundaries for an intermediate structure group of objects based on an object type is determined. An illumination contribution for each plane of the spatial boundary of the intermediate structure is determined for the objects in the 3D scene. The 3D scene is then rendered based on the determined spatial boundary and the illumination contribution of the intermediate structure for each object in the scene.