1. Introduction

Atmospheric light scattering is an important natural phenomenon, which arises when light interacts with the particles distributed in the media. Rendering such effects can be exploited by many applications, such as computer games, to greatly improve scene realism. To accurately compute scattering contribution, a complex nested integral has to be solved for each screen pixel. Due to the complexity of the computations involved, achieving natural-looking atmospheric scattering effects at interactive frame rates is a challenging problem.