“An Empirical Model for Heterogeneous Translucent Objects” by Fuchs, Goesele, Chen and Seidel
Conference:
Type(s):
Title:
- An Empirical Model for Heterogeneous Translucent Objects
Session/Category Title: Lighting Models in Rendering
Presenter(s)/Author(s):
Abstract:
Jensen et al. [2001] proposed to approximate multiple scattering in inhomogeneous materials by a set of coefficients for the dipole model per incident light position and a global modulation texture. This model is however not strictly valid for inhomogeneous or geometrically complex objects and difficult to apply to captured scattering data. Our model for subsurface light transport introduces therefore two modifications: The behavior of multiple scattering is strongly dominated by the exponential fall-off of the intensity. We therefore replace the dipole model by a sum of exponential functions. This approach improves modeling capabilities for heterogeneous material and allows to adapt to a more general surface geometry. The standard dipole model assumes a rotationally symmetric behavior of the multiple scattering component. This is inaccurate for material with a preferred scattering direction or for heterogeneous material. We therefore introduce an anisotropic model and determine a set of parameters per set of directions between incoming and outgoing positions~xi and~xo.
References:
Goesele, M., Lensch, H. P. A., Lang, J., Fuchs, C., and Seidel, H.-P. 2004. DISCO – Acquisition of Translucent Objects. ACM Trans. Graph. (SIGGRAPH 2004) 23, 3, 835–844. Google ScholarDigital Library
Jensen, H. W., Marschner, S. R., Levoy, M., and Hanrahan, P. 2001. A Practical Model for Subsurface Light Transport. In SIGGRAPH 2001, 511–518.
