A Simplified Plane-Parallel Scattering Model and Its Application to Hair Rendering

Shinya, Mikio; Shiraishi, Mishio; Dobashi, Yoshinori; Iwasaki, Kei; Nishita, Tomoyuki

doi:10.1109/pacificgraphics.2010.19

Cited by 9 publications

(7 citation statements)

References 14 publications

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“…The shaded image will be filtered by the distribution function estimated in the following main process. Although illumination from an external source may be evaluated by simple attenuation, we adopted the simplified plane‐parallel (SPP) model [SSD*10] to capture multiple‐scattering features of the light distributed in the scene.…”

Section: Application To Screen‐space Scattering Simulationsmentioning

confidence: 99%

Multiple Scattering Approximation in Heterogeneous Media by Narrow Beam Distributions

Shinya

Dobashi

Shiraishi

et al. 2016

Computer Graphics Forum

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Fast realistic rendering of objects in scattering media is still a challenging topic in computer graphics. In presence of participating media, a light beam is repeatedly scattered by media particles, changing direction and getting spread out. Explicitly evaluating this beam distribution would enable efficient simulation of multiple scattering events without involving costly stochastic methods. Narrow beam theory provides explicit equations that approximate light propagation in a narrow incident beam. Based on this theory, we propose a closed-form distribution function for scattered beams. We successfully apply it to the image synthesis of scenes in which scattering occurs, and show that our proposed estimation method is more accurate than those based on the Wentzel-Kramers-Brillouin (WKB) theory.

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Section: Application To Screen‐space Scattering Simulationsmentioning

confidence: 99%

Multiple Scattering Approximation in Heterogeneous Media by Narrow Beam Distributions

Shinya

Dobashi

Shiraishi

et al. 2016

Computer Graphics Forum

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“…However, their technique requires fixing scattering parameters offline and ignores the eccentricity of the hair. An alternative way to compute multiple scattering effects is by using a plane-parallel model, as proposed by [Shinya et al 2010]. While this method is fast under simple lighting, it is still very expensive for rendering under area or environment lights.…”

Section: Related Workmentioning

confidence: 99%

“…This enables artists and designers to edit hair appearance at will, and receive realistic rendering feedbacks at interactive speed. Existing methods already support such capability under simple lighting, such as a few point or directional lights [Zinke et al 2008;Yuksel and Keyser 2008;Shinya et al 2010;Sadeghi et al 2010]. However, it remains a challenge to render and simultaneously edit hair appearance under complex lighting such as environment maps [Debevec and Malik 1997].…”

Section: Introductionmentioning

confidence: 99%

Interactive hair rendering and appearance editing under environment lighting

et al. 2011

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Figure 1: Our algorithm achieves interactive hair rendering and appearance editing under environment lighting, including both single and multiple scattering effects. In this example, the user directly paints onto the hair to edit the spatially-varying scattering parameters. This results in a dynamic simulation of hair coloring. From left to right, the hair is dyed with a progressively more vivid color. The environment map is represented by 40 SRBF lights, and our algorithm runs at 8.3 fps on an NVIDIA GTX 580. AbstractWe present an interactive algorithm for hair rendering and appearance editing under complex environment lighting represented as spherical radial basis functions (SRBFs). Our main contribution is to derive a compact 1D circular Gaussian representation that can accurately model the hair scattering function introduced by [Marschner et al. 2003]. The primary benefit of this representation is that it enables us to evaluate, at run-time, closed-form integrals of the scattering function with each SRBF light, resulting in efficient computation of both single and multiple scatterings. In contrast to previous work, our algorithm computes the rendering integrals entirely on the fly and does not depend on expensive precomputation. Thus we allow the user to dynamically change the hair scattering parameters, which can vary spatially. Analyses show that our 1D circular Gaussian representation is both accurate and concise. In addition, our algorithm incorporates the eccentricity of the hair. We implement our algorithm on the GPU, achieving interactive hair rendering and simultaneous appearance editing under complex environment maps for the first time.

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“…Recently, a simplified plane-parallel (SPP) scattering model was reported and applied to hair rendering [5]. In this paper, we present more detailed discussions on the SPP model and decribe its application to tree rendering.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Plane-parallel Scattering Model for Rendering Densely Distributed Objects such as Foliage

Shinya

Dobashi

Iwasaki

et al. 2013

Journal of Information Processing

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Fast computation of multiple reflections and scattering among complex objects is very important in photorealistic rendering. This paper applies the plane-parallel scattering theory to the rendering of densely distributed objects such as trees. We propose a simplified plane-parallel scattering model that has very simple analytic solutions, allowing efficient evaluation of multiple scattering. A geometric compensation method is also introduced to cope with the infinite plane condition, required by the plane-parallel model. The scattering model was successfully applied to tree rendering. Comparison with a Monte Carlo method was made and reasonable agreement was confirmed. A rendering system based on the model was implemented and multiple inter-reflections were effectively obtained. The view-independent feature of the model allows fast display of scenes. The pre-computation is also modest, permitting interactive control of lighting conditions.

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A Simplified Plane-Parallel Scattering Model and Its Application to Hair Rendering

Cited by 9 publications

References 14 publications

Multiple Scattering Approximation in Heterogeneous Media by Narrow Beam Distributions

Multiple Scattering Approximation in Heterogeneous Media by Narrow Beam Distributions

Interactive hair rendering and appearance editing under environment lighting

A Simplified Plane-parallel Scattering Model for Rendering Densely Distributed Objects such as Foliage

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