Abstract: This paper presents a new approach that can interactively produce realistic lighting effect including direct and indirect illumination caused by complex luminaries. In this approach,an image based data structure is employed to represent the spatial distribution of irradiance function,which can be used in the irradiance reconstruction stage in real-time rendering.The processing contains two stages： first the irradiance contribution from a given object is evaluated and stored in a volumetric data structure；then the irradiance required by illumination calculation can be reconstructed from the precomputed volumetric data.Currently this method can handle arbitrary light source and diffuse inter-reflection.