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Rendering grass blowing in the wind with global illumination

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4 Author(s)
Max, N ; Computer Science Department, University of California, Davis, CA 95616, USA ; Saito, S ; Watanabe, K ; Nakajima, M

We have simulated a time varying wind field using the lattice Boltzmann model, and its effect on blades of grass with a simple mass-spring model. We present a global illumination model for multiple scattering of incident sun and sky illumination within the field of grass. We model the grass as a continuous distribution of infinitesimal colored scattering flakes and solve a system of differential equations for the radiance transport. We repeat this for a collection of grass bending directions and amounts, and then interpolate the solutions when rendering animations of blowing grass.

Published in:

Tsinghua Science and Technology  (Volume:15 ,  Issue: 2 )