TransCut: Interactive Rendering of Translucent Cutouts

Li, Dongping; Sun, Xin; Ren, Zhong; Lin, Stephen; Tong, Yiying; Guo, Baining; Zhou, Kun

doi:10.1109/tvcg.2012.127

Cited by 14 publications

(7 citation statements)

References 33 publications

(69 reference statements)

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“…Penner and Borshukov [PB11] pre‐integrate the illumination effects of subsurface scattering due to curvature and shadowing into textures, assuming that surface normals can be pre‐blurred, and that soft shadows are used. Recent real‐time techniques use the diffusion approximation to render optically thick materials [WZT*08], including using finite elements and finite differences to support arbitrary, non‐locally flat geometry [WWH*10, LSR*13].…”

Section: Previous Workmentioning

confidence: 99%

Separable Subsurface Scattering

Jiménez

Zsolnai

Jarabo

et al. 2015

Computer Graphics Forum

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Figure 1: Real-time results of our method for simulating translucent materials (skin on the left, ketchup on the right). Our separable subsurface-scattering method enables the generation of these images using only two convolutions (versus 12 in the sum-of-Gaussians approach [dLE07, JSG09]) and seven samples per pixel, while featuring quality comparable with the current state of the art, at a fraction of its cost. It can be implemented as a post-processing step and takes only 0.489 ms per frame on an AMD Radeon HD 7970 at 1080p, which makes it highly suitable for challenging real-time scenarios. AbstractIn this paper we propose two real-time models for simulating subsurface scattering for a large variety of translucent materials, which need under 0.5 milliseconds per frame to execute. This makes them a practical option for realtime 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 twelve) 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 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.

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Section: Previous Workmentioning

confidence: 99%

Separable Subsurface Scattering

Jiménez

Zsolnai

Jarabo

et al. 2015

Computer Graphics Forum

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“…These approaches, however, either restrict illumination to simple light sources or are not scalable to complex scenes. Recently, Li et al [33] focused on rendering translucent cutouts and presented TransCut. By implementing the algorithm on the GPU, they achieved interactive frame rates for small scenes.…”

Section: Subsurface Scattering Renderingmentioning

confidence: 99%

Dual-Matrix Sampling for Scalable Translucent Material Rendering

Lin

et al. 2015

IEEE Trans. Visual. Comput. Graphics

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Abstract-This paper introduces a scalable algorithm for rendering translucent materials with complex lighting. We represent the light transport with a diffusion approximation by a dual-matrix representation with the Light-to-Surface and Surface-to-Camera matrices. By exploiting the structures within the matrices, the proposed method can locate surface samples with little contribution by using only subsampled matrices and avoid wasting computation on these samples. The decoupled estimation of irradiance and diffuse BSSRDFs also allows us to have a tight error bound, making the adaptive diffusion approximation more efficient and accurate. Experiments show that our method outperforms previous methods for translucent material rendering, especially in large scenes with massive translucent surfaces shaded by complex illumination.

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“…Li et al . [LSR*13] used the same tetrahedral representation but a more efficient method for constructing the coefficient matrix, which allowed realtime application under changing mesh topology. In contrast to our approach, all this work still focuses on rendering highly opaque media with well‐defined surfaces.…”

Section: Related Workmentioning

confidence: 99%

Flux‐Limited Diffusion for Multiple Scattering in Participating Media

Koerner

Portsmouth²,

Sadlo

et al. 2014

Computer Graphics Forum

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For the rendering of multiple scattering effects in participating media, methods based on the diffusion approximation are an extremely efficient alternative to Monte Carlo path tracing. However, in sufficiently transparent regions, classical diffusion approximation suffers from non-physical radiative fluxes which leads to a poor match to correct light transport. In particular, this prevents the application of classical diffusion approximation to heterogeneous media, where opaque material is embedded within transparent regions. To address this limitation, we introduce flux-limited diffusion, a technique from the astrophysics domain. This method provides a better approximation to light transport than classical diffusion approximation, particularly when applied to heterogeneous media, and hence broadens the applicability of diffusion-based techniques. We provide an algorithm for flux-limited diffusion, which is validated using the transport theory for a point light source in an infinite homogeneous medium. We further demonstrate that our implementation of flux-limited diffusion produces more accurate renderings of multiple scattering in various heterogeneous datasets than classical diffusion approximation, by comparing both methods to ground truth renderings obtained via volumetric path tracing.Comment: Accepted in Computer Graphics Foru

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TransCut: Interactive Rendering of Translucent Cutouts

Cited by 14 publications

References 33 publications

Separable Subsurface Scattering

Separable Subsurface Scattering

Dual-Matrix Sampling for Scalable Translucent Material Rendering

Flux‐Limited Diffusion for Multiple Scattering in Participating Media

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