Efficient Implementation of the Dual Scattering Model in RenderMan

Iman Sadeghi1, Rasmus Tamstorf2

1UC San Diego, 2Walt Disney Animation Studios

Disney Technical Reports

Simulating the multiple scattered light is critical for rendering light

Abstract:

Simulating the multiple scattered light is critical for rendering light colored hair. Most of the existing models for simulating the exact behavior of multiple scattered light are computationally expensive and require additional data structures. The Dual Scattering model [Zinke et al. 2008] is a fast and relatively accurate model that approximates the behavior of multiple scattering component. In this report we provide the necessary details needed for implementing the Dual Scattering model ef´Čüciently without any ray tracing steps and any extra data structures. We have implemented this model in RenderMan and it has formed the foundation for our work in [Sadeghi et al. 2010].
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Text Reference:

Iman Sadeghi, Rasmus Tamstorf. Efficient Implementation of the Dual Scattering Model in RenderMan. Disney Technical Reports, Walt Disney Animation Studios, 2010.
BibTex Reference:
@techreport{sadeghi2010dualscattering,
	author = {Sadeghi, Iman and Tamstorf, Rasmus},
	title = {Efficient Implementation of the Dual Scattering Model in RenderMan},
	institution = {Walt Disney Animation Studios},
	year = {2010},
}