5004

A lighting model for fast rendering of forest ecosystems

Robert Geist, Jay Steele
Clemson University, Clemson, SC
IEEE Symposium on Interactive Ray Tracing, 2008. RT 2008

@inproceedings{geist2008lighting,

   title={A lighting model for fast rendering of forest ecosystems},

   author={Geist, R. and Steele, J.},

   booktitle={Interactive Ray Tracing, 2008. RT 2008. IEEE Symposium on},

   pages={99–106},

   year={2008},

   organization={IEEE}

}

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Real-time rendering of large-scale, forest ecosystems remains a challenging problem, in that important global illumination effects, such as leaf transparency and inter-object light scattering, are difficult to capture, given tight timing constraints and models that typically contain hundreds of millions of primitives. This paper proposes a new lighting model, adapted from a model previously used to light convective clouds and other participating media, together with a distribution of ray processing across multiple GPUs, in order to achieve these global illumination effects while maintaining near real-time performance. The lighting model is based on a lattice-Boltzmann method in which reflectance, transmittance, and absorptance parameters are taken from measurements of real plants. The lighting model is solved as a pre-processing step and requires only seconds on a single GPU. The ray tracing engine uses the well-known short-stack algorithm, due to Horn, Sugerman, Houston, and Hanrahan. Both the pre-processing step and the ray tracing engine make extensive use of NVIDIApsilas compute unified device architecture (CUDA).
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