Activision Blizzard, Inc.
Participating media baking

Abstract:

According to one embodiment, a method includes identifying a scene to be rendered, creating a plurality of light scattering tables within the scene, performing a computation of light extinction and light in-scattering within participating media of the scene, utilizing the plurality of light scattering tables, and during a ray tracing of the scene, approximating spatially heterogeneous media of the scene as spatially homogeneous media of the scene by performing a volume intersection for each light ray associated with the spatially heterogeneous media of the scene to determine a homogeneous scattering coefficient for the light ray, and applying to the spatially heterogeneous media of the scene one of the plurality of light scattering tables, where each of the plurality of light scattering tables corresponds to a single homogeneous scattering coefficient.