An artist friendly hair shading system

Sadeghi, Iman; Pritchett, Heather; Jensen, Henrik Wann; Tamstorf, Rasmus

doi:10.1145/1833349.1778793

Cited by 17 publications

(30 citation statements)

References 14 publications

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“…First, we would like to incorporate the artist-friendly model by [Sadeghi et al 2010]. Since this model is fundamentally based on Marschner's model, the dual scattering approximation, and the use cosine/Gaussian functions to approximate the R, TT, TRT azimuthal functions, it can be directly combined with SRBF lighting using our proposed method.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, Sadeghi et al [2010] proposed an artist-friendly control (AFC) model for intuitive editing of hair parameters. Their method assumes simple lighting conditions.…”

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%

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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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Section: Discussionmentioning

confidence: 99%

“…Recently, Sadeghi et al [2010] proposed an artist-friendly control (AFC) model for intuitive editing of hair parameters. Their method assumes simple lighting conditions.…”

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interactive hair rendering and appearance editing under environment lighting

et al. 2011

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“…We target the control of more general volumetric effects, and thus use a different mathematical model (photon beams). Sadeghi et al [2010] present an art-directable shading model for hair rendering in animated feature films. present BendyLights, a non-linear spotlight for controlling lighting and shadows.…”

Section: Previous Workmentioning

confidence: 99%

A programmable system for artistic volumetric lighting

et al. 2011

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Figure 1: Our system was used to author artistic volumetric effects for the movie Tangled. Our technique's ability to produce curving light beams is used to match the organic artistic style of the film. AbstractWe present a method for generating art-directable volumetric effects, ranging from physically-accurate to non-physical results. Our system mimics the way experienced artists think about volumetric effects by using an intuitive lighting primitive, and decoupling the modeling and shading of this primitive. To accomplish this, we generalize the physically-based photon beams method to allow arbitrarily programmable simulation and shading phases. This provides an intuitive design space for artists to rapidly explore a wide range of physically-based as well as plausible, but exaggerated, volumetric effects. We integrate our approach into a real-world production pipeline and couple our volumetric effects to surface shading.

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confidence: 99%

ISHair

Ou¹,

Xie²,

Krishnamachari³

et al. 2012

ACM SIGGRAPH 2012 Posters on - SIGGRAPH '12

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We present an importance sampling method for the bidirectional scattering distribution function (bsdf ) of hair, based on the multilobe hair scattering model presented in [Sadeghi et al. 2010]. Our algorithm is efficient, easy to implement and it has no significant memory overhead or need for precomputation. We have integrated our method into both a research raytracer and a micropolygon based production renderer. Figure 1 compares the rendering quality of our method to statified uniform sampling for both direct (environment) lighting rendered with our production renderer and indirect lighting rendered with path tracing. In both cases, our method delivers significantly better image quality than uniform sampling using the same number of samples.

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An artist friendly hair shading system

Cited by 17 publications

References 14 publications

Interactive hair rendering and appearance editing under environment lighting

Interactive hair rendering and appearance editing under environment lighting

A programmable system for artistic volumetric lighting

ISHair

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