Separable Subsurface Scattering

Jimenez, J. ; Zsolnai, K. ; Jarabo, A. (Universidad de Zaragoza) ; Freude, C. ; Auzinger, T. ; Wu, X.C. ; Von, Der Pahlen ; Wimmer, M. ; Gutierrez, D. (Universidad de Zaragoza)

Resumen: In this paper, we propose two real-time models for simulating subsurface scattering for a large variety of translucent materials, which need under 0.5 ms per frame to execute. This makes them a practical option for real-time production scenarios. Current state-of-the-art, real-time approaches simulate subsurface light transport by approximating the radially symmetric non-separable diffusion kernel with a sum of separable Gaussians, which requires multiple (up to 12) 1D convolutions. In this work we relax the requirement of radial symmetry to approximate a 2D diffuse reflectance profile by a single separable kernel. We first show that low-rank approximations based on matrix factorization outperform previous approaches, but they still need several passes to get good results. To solve this, we present two different separable models: the first one yields a high-quality diffusion simulation, while the second one offers an attractive trade-off between physical accuracy and artistic control. Both allow rendering of subsurface scattering using only two 1D convolutions, reducing both execution time and memory consumption, while delivering results comparable to techniques with higher cost. Using our importance-sampling and jittering strategies, only seven samples per pixel are required. Our methods can be implemented as simple post-processing steps without intrusive changes to existing rendering pipelines.

Idioma: Inglés

DOI: 10.1111/cgf.12529

Año: 2015

Publicado en: COMPUTER GRAPHICS FORUM 34, 6 (2015), 188-197
ISSN: 0167-7055

Factor impacto JCR: 1.542 (2015)

Categ. JCR: COMPUTER SCIENCE, SOFTWARE ENGINEERING rank: 17 / 106 = 0.16 (2015) - Q1 - T1

Factor impacto SCIMAGO: 0.806 - Computer Networks and Communications (Q1) - Computer Graphics and Computer-Aided Design (Q1)

Financiación: info:eu-repo/grantAgreement/EC/FP7/251415/EU/Final Report Summary - GOLEM (Realistic Virtual Humans)/GOLEM
Financiación: info:eu-repo/grantAgreement/EC/FP7/288914/EU/Vanquishing fear and apathy through E-inclusion: \nPersonalised and populated Realistic Virtual Environments for clinical, home and mobile platforms/VERVE
Financiación: info:eu-repo/grantAgreement/ES/MINECO/Lightslice
Financiación: info:eu-repo/grantAgreement/ES/MINECO/TAMA

Tipo y forma: Article (Published version)

Área (Departamento): Área Lenguajes y Sistemas Inf. (Dpto. Informát.Ingenie.Sistms.)