We thank the anonymous reviewers for their feedback. This work was supported in part by the National Science Foundation under Grant Nos.: 14-09286, 13-19483, CAREER-1453101 and Graduate Student Research Fellowship No. DGE-16-44869, the Natural Sciences and Engineering Research Council of Canada under Grant No. RGPIN-04360-2014, the National GEM Consortium, Pixar, and Adobe. We would also like to thank Peter Yichen Chen for his assistance, Ryan Goldade for advice on surface reconstruction, Xinxin Zhang for his AMGPCG pressure solver, Fang Da and Bo Zhu for insightful discussions, Daisy Nyugen, Derrick Lim for their help on storage and computational devices, Cristin Barghiel, Monika Janek, and Silvina Rocca for their technical support on SideFX® Houdini.