Parameter Estimation of BSSRDF for Heterogeneous Materials

Sone, Hiroki; Hachisuka, Toshiya; Koike, Takafumi

Parameter Estimation of BSSRDF for Heterogeneous Materials

Files

073-076.pdf (3.53 MB)

Date

2017

Authors

Sone, Hiroki
Hachisuka, Toshiya
Koike, Takafumi

Publisher

The Eurographics Association

Abstract

Rendering of highly scattering media is computationally expensive in general. While existing BSSRDF models can accurately and efficiently approximate light scattering in homogeneous media, we still have to resort to costly Monte Carlo simulation for heterogeneous media. We propose a simple parameter estimation method which enables homogeneous BSSRDF models to approximate the appearance of heterogeneous media. The main idea is to estimate the input optical parameters of a given homogeneous BSSRDF model such that the output well approximates light transport within heterogeneous media. Our method takes spatially varying optical coefficients into account by taking averages of the coefficients around the incident and exitant points. This approach is motivated by the path integral theory which predicts how wide the beam of light will spread in heterogeneous media. Since our method provides parameters for homogeneous BSSRDF models, it is applicable to many existing BSSRDF models and easy to integrate into existing rendering systems. We show that our modification produces more accurate results than the existing heuristics with the same goal.

        @inproceedings{10.2312:egsh.20171018
,
booktitle = {EG 2017 - Short Papers
},
editor = {Adrien Peytavie and Carles Bosch
},
title = {{Parameter Estimation of BSSRDF for Heterogeneous Materials
}},
author = {Sone, Hiroki and 
Hachisuka, Toshiya and 
Koike, Takafumi
},
year = {2017
},
publisher = {The Eurographics Association
},
ISSN = {1017-4656
},
ISBN = {},
DOI = {10.2312/egsh.20171018
}
}