An empirical BSSRDF model
Abstract
We present a new model of the homogeneous BSSRDF based on large-scale simulations. Our model captures the appearance of materials that are not accurately represented using existing single scattering models or multiple isotropic scattering models (e.g. the diffusion approximation). We use an analytic function to model the 2D hemispherical distribution of exitant light at a point on the surface, and a table of parameter values of this function computed at uniformly sampled locations over the remaining dimensions of the BSSRDF domain. This analytic function is expressed in elliptic coordinates and has six parameters which vary smoothly with surface position, incident angle, and the underlying optical properties of the material (albedo, mean free path length, phase function and the relative index of refraction). Our model agrees well with measured data, and is compact, requiring only 250MB to represent the full spatial- and angular-distribution of light across a wide spectrum of materials. In practice, rendering a single material requires only about 100KB to represent the BSSRDF.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 27, 2009
- Source ID
- 10.1145/1531326.1531336
Entities
People
- Craig Donner
- Henrik Wann Jensen
- Jason Lawrence
- Ravi Ramamoorthi
- Shree Nayar
- Toshiya Hachisuka
Organizations
- Columbia University
- National Science Foundation
- Office of Naval Research
- University of California, Berkeley
- University of California, San Diego
- University of Virginia