A bidirectional formulation for Walk on Spheres
A bidirectional formulation for Walk on Spheres
复制标题
球体行走的双向公式
DOI:
10.1111/cgf.14586
复制
发表时间:
2022
影响因子:
2.5
通讯作者:
Jarosz, Wojciech
中科院分区:
文献类型:
--
作者:
Qi, Yang;Seyb, Dario;Bitterli, Benedikt;Jarosz, Wojciech
Numerically solving partial differential equations (PDEs) is central to many applications in computer graphics and scientific modeling. Conventional methods for solving PDEs often need to discretize the space first, making them less efficient for complex geometry. Unlike conventional methods, the walk on spheres (WoS) algorithm recently introduced to graphics is a grid‐free Monte Carlo method that can provide numerical solutions ofPoisson equations without discretizing space. We draw analogies between WoS and classical rendering algorithms, and find that the WoS algorithm is conceptually equivalent to forward path tracing. Inspired by similar approaches in light transport, we propose a novel WoS reformulation that operates in the reverse direction, starting at source points and estimating the Green's function at “sensor” points. Implementations of this algorithm show improvement over classical WoS in solving Poisson equation with sparse sources. Our approach opens exciting avenues for future algorithms for PDE estimation which, analogous to light transport, connect WoS walks starting from sensors and sources and combine different strategies for robust solution algorithms in all cases.
登录
查看更多内容
影响因子:
6.2
作者:
Rohan Sawhney;Keenan Crane
通讯作者:
Keenan Crane
DOI:
10.1145/3306346.3323041
发表时间:
2019-07
期刊:
ACM Transactions on Graphics (TOG)
影响因子:
--
作者:
Xi Deng;Shaojie Jiao;Benedikt Bitterli;Wojciech Jarosz
通讯作者:
Xi Deng;Shaojie Jiao;Benedikt Bitterli;Wojciech Jarosz
DOI:
--
发表时间:
2017
期刊:
SIGGRAPH Courses
影响因子:
--
作者:
Luca Fascione;J. Hanika;Rob Pieké;Christophe Hery;Ryusuke Villemin;Thorsten;Christopher D. Kulla;D. Heckenberg;A. Mazzone
通讯作者:
A. Mazzone
影响因子:
6.2
作者:
Sawhney, Rohan;Seyb, Dario;Jarosz, Wojciech;Crane, Keenan
通讯作者:
Crane, Keenan
影响因子:
36.5
作者:
Per H. Christensen;Wojciech Jarosz
通讯作者:
Wojciech Jarosz