CompAesth 05: Workshop on Computational Aesthetics
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Browsing CompAesth 05: Workshop on Computational Aesthetics by Subject "Categories and Subject Descriptors (according to ACM CCS): I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism-Color, shading, shadowing, and texture"
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Item Computational Automotive Color Appearance(The Eurographics Association, 2005) Meyer, Gary W.; Shimizu, Clement; Laszlo Neumann and Mateu Sbert and Bruce Gooch and Werner PurgathoferA computer graphic system has been developed that permits the interactive design of new automotive finishes. The software makes use of a reflection model for car paint that is based on industry standards for measuring the appearance characteristics of the paint. These measurements include gloss for the clearcoat and three aspecular measurements for the metallic basecoat. The program interface provides a means for altering the reflectance properties of the paint and for visualizing the effect of those changes on the color appearance of the car. The desired aspecular measurements for the new paint can be input to a paint formulation system so that the paint can be manufactured. A test of the system shows good correspondence between the designed and the fabricated paint.Item Computer Aided Color Appearance Design using Environment Map Based Lighting(The Eurographics Association, 2005) Shimizu, Clement; Meyer, Gary W.; Laszlo Neumann and Mateu Sbert and Bruce Gooch and Werner PurgathoferA BRDF approximation is developed that is suitable for interactive color appearance design in direct lighting provided by environment maps. The BRDFs are approximated as a linear combination of cosine lobes with a fixed set of specular exponents. A nonlinear optimization routine is used to fit the cosine lobes to BRDFs appropriate for a specific color appearance design application: automotive paint. Modification and rendering of the BRDF is made possible by linearly combining prefiltered environment maps for each cosine lobe in real time.