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Physically-Based Interactive Bi-Scale Material Design



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Physically Based Interactive Bi Scale Material Design Hongzhi Wu Julie Dorsey Holly Rushmeier Computer Graphics Group Yale University Large Scale View Small Scale View Editing Sliders b a c d e Figure 1 Bi scale material design large scale appearance changes produced by editing of small scale geometry b c color d and BRDFs e using our interactive system a which quickly updates the appearance of the large scale object after small scale edits The small scale details rendered with a Lambertian BRDF for a better visualization are shown in the bottom right corner of b e In d the color of the small scale side faces is adjusted to yellow In e the small scale material is changed from a measured silver metallic paint2 BRDF to a Lambertian model Abstract We present the first physically based interactive system to facilitate the appearance design at different scales consistently through manipulations of both small scale geometry and materials The core of our system is a novel reflectance filtering algorithm which rapidly computes the large scale appearance from small scale details by exploiting the low rank structures of the Bidirectional Visible Normal Distribution Function and pre rotated BRDFs in the matrix formulation of our rendering problem Our algorithm is three orders of magnitude faster than a ground truth method We demonstrate various editing results of different small scale geometry with analytical and measured BRDFs In addition we show the applications of our system to physical realization of appearance as well as modeling of real world materials using very sparse measurements CR Categories I 3 7 Computer Graphics Three Dimensional Graphics and Realism Color shading shadowing and texture Keywords rank matrix Links 1 bi scale material editing reflectance filtering lowDL PDF W EB V IDEO Introduction The appearance of materials can vary considerably when viewed at different scales For example individual grains of sand or fab ric threads that are visible on close view



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