@article{Laine2005sg, author = {Samuli Laine and Timo Aila and Ulf Assarsson and Jaakko Lehtinen and Tomas Akenine-M\"oller}, title = {Soft Shadow Volumes for Ray Tracing}, journal = {ACM Transactions on Graphics}, year = {2005}, pages = {1156--1165}, volume = {24}, number = {3}, publisher = {ACM} }