Real‐time homogenous translucent material editing

Xu, Kun; Gao, Yue; Li, Yong; Ju, Tao; Hu, Shi‐Min

doi:10.1111/j.1467-8659.2007.01077.x

Cited by 31 publications

(36 citation statements)

References 26 publications

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“…In general however, these techniques di er from ours: they aim at obtaining interactive but approximate responses to edits, be it directly in the material parameter space [Song et al 2009;Wang et al 2008;Xu et al 2007] or inversely by posing constraints on the appearance [Hašan and Ramamoorthi 2013].…”

Section: Materials Editingmentioning

confidence: 99%

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Scattering-aware texture reproduction for 3D printing

Elek

Sumin

Zhang³

et al. 2017

ACM Trans. Graph.

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Fig. 1. A still life photograph of our optimized printouts. The thickness of all the pictured samples is 1 cm.Color texture reproduction in 3D printing commonly ignores volumetric light transport (cross-talk) between surface points on a 3D print. Such light di usion leads to signi cant blur of details and color bleeding, and is particularly severe for highly translucent resin-based print materials. Given their widely varying scattering properties, this cross-talk between surface points strongly depends on the internal structure of the volume surrounding each surface point. Existing scattering-aware methods use simpli ed models for light di usion, and often accept the visual blur as an immutable property of the print medium. In contrast, our work counteracts heterogeneous scattering to obtain the impression of a crisp albedo texture on top of the 3D print, by optimizing for a fully volumetric material distribution that preserves the target appearance. Our method employs an e cient numerical optimizer on top of a general Monte-Carlo simulation of heterogeneous scattering, supported by a practical calibration procedure to obtain scattering parameters from a given set of printer materials. Despite the inherent translucency of the medium, we reproduce detailed surface textures on 3D prints. We evaluate our system using a commercial, ve-tone 3D print process and compare against the printer's native color texturing mode, demonstrating *Oskar Elek and Denis Sumin share the rst authorship of this work. Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for pro t or commercial advantage and that copies bear this notice and the full citation on the rst page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior speci c permission and/or a fee. Request permissions from permissions@acm.org. © 2017 ACM. 0730-0301/2017/11-ART241 $15.00 DOI: 10.1145/3130800.3130890 that our method preserves high-frequency features well without having to compromise on color gamut.

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Section: Materials Editingmentioning

confidence: 99%

“…Initial works use precomputed radiance transfer (PRT) to globally change bulk scattering and absorption parameters [Wang et al 2008;Xu et al 2007]. Extending these PRT-based approaches to heterogeneous materials, however, would lead to an intractable dimensionality increase.…”

Section: Materials Editingmentioning

confidence: 99%

Scattering-aware texture reproduction for 3D printing

Elek

Sumin

Zhang³

et al. 2017

ACM Trans. Graph.

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“…On the other hand, Xu et al (Xu, et al, 2007) demonstrated that the diffusion profile can be well approximated in real-time using a piecewise polynomial basis even though their method is also based on a numerical method. However, it needs an additional step to determine the optimal locations of the knots which link the polynomial basis.…”

Section: Diffusion Profile Approximationmentioning

confidence: 99%

“…In this work we focuses on developing a real-time editing system for multi-layered translucent materials by building up existing methods by Xu et al (Xu, et al, 2007) and Donner and Jensen (Donner and Jensen, 2005). We significantly reduce the computation time for the convolution process for the diffusion profiles by using the QFHT.…”

Section: Materials Editingmentioning

confidence: 99%

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A real-time editing method for multi-layered translucent materials

Kim

Lee

2016

JAMDSM

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In this paper we introduce a practical method to evaluate the reflectance of a layered turbid medium with a thin layer, which is not possible with the previous methods based on the diffusion theory. To this end, we employ two different reflectance models simultaneously. One is the newly improved 2-flux model for a thin layer and the other is the diffusion model for a thick layer. To combine the evaluation results from these two different models, we introduce a re-parameterization approach which makes these models compatible with each other. We verify that the proposed method yields robust performance by comparing with the Monte Carlo simulation. We also validate visual results and comparing the rendering time ours with other models. IntroductionAt the present day, the aesthetic factors of a product that is influenced by geometric shape and surface appearance have had considerable implications for the product purchase of customers. With the reverse engineering (RE) that creates a 3D virtual model from a physical object, the rendering technique that realistically represents the object in a virtual space greatly helps the appearance design that determines the esthetic of the product and facilitates various product designs without manufacture of a mock-up. These techniques are able to reduce the development cost in early stage of product development. .1 describes the overall procedure showing how the geometry and surface appearance of a 3D CAD model in a design step is progress before developing the product. As shown in the figure, a 3D geometry is able to be created through a 3D scanner or CAD tool and an surface appearance on the 3D geometry produced by mathematic modeing or measurement data for optical properties of real materials. The measurement data detecting light transfort in real materials plays a leading role to realistically represent the 3D model, compared to the mathematic modeing such as Phong shading which is difficult to accurately represnet various appearances. The development for the acquisition method and data fitting algorithm which is suitable to meterial property is very important, since most of industrial products such as electrical goods and mechanical products is consists of complex materials including plastics, fiber, metal etc.The object appearance description can be divided two main approaches depending on the surface reflectance propoerty. A bidirectional reflectance distribution function(BRDF) has to be used to represent opacity meterals such as metal, but it can not estimate subsurface scattering of light which is one of properties regarding translucent materials. To represent the translucent materials such as plastic and rubber, more complex reflectance funtion has to be developed. Fig 2. shows a electrical goods consisted of translucent(rubber) and opacity(metal) materials and describes optical property reflected in each materials.In the last stage of a product design, geometric modification and surface appearance editing can be performed according to the development strate...

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