Light Scattering from Filaments

Zinke, Arno; Weber, Andreas

doi:10.1109/tvcg.2007.43

Cited by 68 publications

(66 citation statements)

References 20 publications

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“…Our new sampling strategy works for fiber models including those of Zinke and Weber [2007], who introduced the formalism of BCSDFs. They also derived a near-field model, important for close rendering of hair fibers.…”

Section: Related Workmentioning

confidence: 99%

“…They also derived a near-field model, important for close rendering of hair fibers. We use the energy-conserving longitudinal term of d'Eon et al [2011] and Zinke and Weber's [2007] method of treating azimuthal roughness-these remove the requirement for root-solvers and careful treatment of caustics required in the original Marschner model.…”

Section: Related Workmentioning

confidence: 99%

“…Zinke and Weber [2007] derived the BCSDF for an opaque, cylindrical fiber with Lambertian reflectance properties. They expressed the exact solution as an integral and gave an approximate expansion of it.…”

Section: Lambertian Fibersmentioning

confidence: 99%

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Importance sampling for physically-based hair fiber models

d’Eon¹,

Marschner

Hanika³

2013

SIGGRAPH Asia 2013 Technical Briefs

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Figure 1: Our new importance sampling strategy allows easy inclusion of Marschner and related hair reflectance functions in physicallybased Monte Carlo renderers. Here we show hair volumes illuminated by environment maps and area lights with unbiased global illumination (computed using a forward path-tracer with multiple importance sampling). Our sampling strategy requires no precomputation, so it is easy to vary the absorption along the fiber (second image), and to add noise to the index of refraction, roughness, and scale tilt to create subtle heterogeneity along each fiber. Each image is 1024 samples/pixel. AbstractWe present a new strategy for importance sampling hair reflectance models. To combine hair reflectance models with increasingly popular physically-based rendering algorithms, an efficient sampling scheme is required to select scattered rays that lead to lower variance and noise. Our new strategy, which is tied closely to the derivation of physically-based fiber functions, works well for both smooth and rough fibers based on the Marschner et al. model and also for Lambertian fibers. It should be directly usable with future hair reflectance models that allow for more general cross-sections and more complex surface properties, provided the lobes are derived in a similar, separable fashion. Our strategy includes lobe selection and can efficiently sample complex lobe shapes like the Marschner TRT function. The scheme is easy to implement and requires no precomputation, allowing fully heterogeneous variation of all fiber parameters.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

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Importance sampling for physically-based hair fiber models

d’Eon¹,

Marschner

Hanika³

2013

SIGGRAPH Asia 2013 Technical Briefs

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“…In order to achieve physically-plausible results the hair shading framework proposed by Zinke and Weber [Zinke and Weber 2007] was used.…”

Section: Renderingmentioning

confidence: 99%

“…This step relies on the fact that the texture images are registered at the 3D head models. The resulting facial hair geometry is then rendered using the framework proposed in [Zinke and Weber 2007] in order to achieve photo-realistic results.…”

Section: Introductionmentioning

confidence: 99%

Toward image-based facial hair modeling

Herrera

Zinke²,

Weber

et al. 2010

Proceedings of the 26th Spring Conference on Computer Graphics

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In this paper we present a novel efficient and fully automated technique to synthesize realistic facial hair-such as beards and eyebrows-on 3D head models. The method requires registered texture images of a target model on which hair needs to be generated. In a first stage of our two-step approach a statistical measure for hair density is computed for each pixel of the texture. In addition, other geometric features such as 2D pixel orientations are extracted, which are subsequently used to generate a 3D model of the individual hair strands. Missing or incomplete information is estimated based on statistical models derived from a database of texture images of over 70 individuals. Using the new approach, characteristics of the hair extracted from a given head may be also transferred to another target.

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Photorealistic cloth in real‐time applications

Kang

Cho

2012

Computer Animation & Virtual

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In this paper, we propose an efficient and stable animation and rendering method for complex mass-spring-based cloth model for interactive applications. Although the mass-spring model can be easily constructed and simulated, it is well known that the model suffers from the instability problem. The method proposed in this paper employs the harmonic oscillation model and analytically integrates the force for better stability and accuracy while keeping the integration scheme still explicit. As the integration scheme is explicit, the method can be easily parallelized, and the performance improvement can be easily obtained by exploiting the parallelism in the graphics processing unit. For the realistic representation of virtual clothes, we also proposed an efficient and effective rendering method for woven surfaces on the basis of alternating anisotropic reflectance and microfacet distribution function rotation.

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Light Scattering from Filaments

Cited by 68 publications

References 20 publications

Importance sampling for physically-based hair fiber models

Importance sampling for physically-based hair fiber models

Toward image-based facial hair modeling

Photorealistic cloth in real‐time applications

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