Atmospheric effects, fog, clouds, lightshafts, volumetric light in games …

Thinking about:

• improve the billboarding and volume feel of NinianeWangs approach to clouds
• mainly visible effects: out-scattering and coarse in-scattering
• coarse volume-based solution and detail particles/billboards
• probabilistic samples using available data (like variance shadow maps, ssao)
• path through volume is a line in a shadowmap – use for integration
• apply existing techniques for underwater effects to general participating media
• consider that spectrum is not just rgb and scattering is wavelength dependent
• analytically integrable fog density, tensor decompostion, screen space meshes
• depth peeling for combination with transparent objects and other effects
• painterly, cartoonish or ornamental clouds and fog
• …