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Our system mimics the way experienced artists think about volumetric effects by using an intuitive lighting primitive, and decoupling the\n            <jats:italic>modeling<\/jats:italic>\n            and\n            <jats:italic>shading<\/jats:italic>\n            of this primitive. To accomplish this, we generalize the physically-based photon beams method to allow arbitrarily programmable simulation and shading phases. This provides an intuitive design space for artists to rapidly explore a wide range of physically-based as well as plausible, but exaggerated, volumetric effects. 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