A method, system, and computer program product/computer readable storage medium provide the ability to render a shadow. A three-dimensional (3D) scene comprising an object is obtained. An external physical light source that is external to the 3D scene is detected by a sensor. An artificial light source is created in the 3D scene that corresponds to the external physical light source. Based on the artificial light source, a shadow of the object is cast. The 3D scene including the object and the shadow are then rendered.