Particle-based Visual Simulation of Clouds

KIKUCHI Tsukasa, MURAOKA Kazunobu, CHIBA Norishige

Computer graphics(CG) is a key technology for producing visual contents. Currently, computer generated imagery(CGI) techniques are being developed and applied, particularly in the field of film production, to provide total composition of real images and CG images. Therefore, the development of CG technologies that are capable of realistically displaying a variety of objects and phenomena that exist in the natural world is becoming increasingly important. This paper proposes a three-dimensional CG technique for generating cloud images. The proposed technique regards cloud as a group of cloud masses, each of which is represented by a single particle (cloud particle) for the visual simulation of cloud. This technique consists of a modeling process and a rending process. The modeling process moves each particle according to the ascending force, which is dependent on the relationship between temperature, atmospheric pressure, and air density, the force of interaction between particles, and the repulsive force the particle receives from the atmosphere. The rendering process takes into account only the first-order scattering using the phase function, which is coupled from isotropic scattering, Mie scattering, Rayleigh scattering in the volume data defined by the cloud particles.

Particle-based Visual Simulation of Clouds

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