MAM2013: Eurographics Workshop on Material Appearance Modeling: Issues and Acquisition

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https://diglib.eg.org/handle/10.2312/2585

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Browsing MAM2013: Eurographics Workshop on Material Appearance Modeling: Issues and Acquisition by Title

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    BTF-based Material Representations: Current Challenges
    (The Eurographics Association, 2013) Ruiters, R.; Klein, R.; Reinhard Klein and Holly Rushmeier
    The development of Bidirectional Texture Functions (BTFs) has made it possible for a wide range of different materials to acquire their characteristic appearance from a real-world counterpart and reproduce it faithfully in a high-quality rendering, that is hard to distinguish from an actual photograph. However, they have not yet found wide-spread use in practical applications. In this paper, we discuss, from our point of view, the main reasons for this and which unanswered questions and challenges for future research in this area remain. We focus on three different aspects: How can BTFs be measured and represented more efficiently? How can they be edited intuitively? And finally, can we find a perceptual difference metric between materials?
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    DOME II: A Parallelized BTF Acquisition System
    (The Eurographics Association, 2013) Schwartz, C.; Sarlette, R.; Weinmann, M.; Klein, R.; Reinhard Klein and Holly Rushmeier
    Bidirectional Texture Functions (BTFs) provide a realistic depiction of the appearance of many real-world materials as they contain the spatially varying light scattering behavior of the material surface. Since editing of existing BTF data is still in its early stages, materials have to be measured from real-world samples. In contrast to the related Spatially Varying BRDFs (SVBRDFs), the reflectance information encoded in a BTF also includes nonlocal scattering effects and therefore does not obey energy conservation or reciprocity. While this higher degree of freedom also contributes to an increased realism, it inadvertently calls for an extensive measurement of reflectance samples, as many regularization approaches from BRDF measurement do not apply. In this paper, we present an automated, parallelized, robust, fast and transportable setup for the acquisition of BTFs from flat samples as well as 3D objects using camera and light arrays: the DOME II. In contrast to previous camera array approaches, the present setup, which is comprised of high-quality industry grade components, overcomes several issues regarding stability, reliability and precision. It achieves a well balanced state-of-the-art acquisition performance in terms of speed and quality at reasonable costs.
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    From Color to Appearance in the Real World
    (The Eurographics Association, 2013) Ellens, M.; Mueller, G.; Lamy, F.; Reinhard Klein and Holly Rushmeier
    X-Rite's declared ambition is to create a digital ecosystem for appearance; a daunting challenge that has many dimensions and has not been accomplished so far. In this short paper we sketch a path from color to full appearance which aims at solving this challenge.
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    Grand Challenges: Material Models in the Automotive Industry
    (The Eurographics Association, 2013) Schregle, R.; Denk, C.; Slusallek, P.; Glencross, M.; Reinhard Klein and Holly Rushmeier
    Material reflectance definitions are core to high fidelity visual simulation of objects within a compelling 3D scene. In the automotive industry these are used across the entire business process: from conceptualisation of a new product range, through to the final sale. However, current state-of-the-art of material representations leave much to be desired for fast and practical deployment in the industry. Even after decades of research and development, there are no interoperable standards for material models to facilitate exchange between applications. A large discrepancy also exists between the quality of material models used (and indeed the quality at which they can be displayed) across the spectrum of use-cases within the industry. Focussing on the needs of the Automotive Industry, in this position paper, we summarise the main issues that limit the effective use of material models. Furthermore, we outline specific solutions we believe could be investigated in order to address this problem. This paper is the result of a review conducted in conjunction with several key players in the automotive field.
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    Interactive Appearance Design in the Presence of Optically Complex
    (The Eurographics Association, 2013) Schroeder, K.; Zincke, A.; Reinhard Klein and Holly Rushmeier
    In this position paper, we discuss the usability of different material representations for interactive appearance design in the context of visual prototyping. We emphasize the importance of methods explicitly considering microgeometry, particularly when combined with efficient volumetric representations. Decoupling of small-scale geometric structure and optical properties allows for the most comprehensive edits while still achieving physically plausible results, even for optically complex materials such as cloth.
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    Material Modeling with Physical Constraints
    (The Eurographics Association, 2013) Weidlich, A.; Meseth, J.; Reinhard Klein and Holly Rushmeier
    The workflows and interfaces of commercial rendering software are currently designed for believable rendering purposes. However, for predictive rendering other approaches are needed; for example, the usual approach to describe a material or a colour is to use RGB values for diffuse and specular. Since these parameters do not have a physical meaning, these approaches are clearly not suitable for physically based rendering and in particular predictive rendering where we have to deal with complex BRDFs. An investigation is missing on how existing workflows have to be changed and expanded to make them suitable for predictive rendering without losing existing workflows.
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    Towards a Practical Gamut of Appearance Acquisition
    (The Eurographics Association, 2013) Fuchs, M.; Koch, S.; Gieseke, L.; Mozer, F.; Eberhardt, B.; Reinhard Klein and Holly Rushmeier
    We propose discussing the performance of appearance modeling in terms of supported material and illumination gamut. While we have a precise understanding of the cost of any given appearance modeling method, performance is intrinsically hard to express without standardized material and illumination test scenarios. This lack of vocabulary hampers comparability between alternative approaches as well as the communication with community outsiders.