Lux, RolandTrapp, MatthiasSemmo, AmirDöllner, JürgenSilvester Czanner and Wen Tang2014-01-312014-01-312013978-3-905673-98-2https://doi.org/10.2312/LocalChapterEvents.TPCG.TPCG13.101-108This paper presents a novel interactive rendering technique for creating and editing shadings for man-made objects in technical 3D visualizations. In contrast to shading approaches that use intensities computed based on surface normals (e.g., Phong, Gooch, Toon shading), the presented approach uses one-dimensional gradient textures, which can be parametrized and interactively manipulated based on per-object bounding volume approximations. The fully hardware-accelerated rendering technique is based on projective texture mapping and customizable intensity transfer functions. A provided performance evaluation shows comparable results to traditional normal-based shading approaches. The work also introduce simple direct-manipulation metaphors that enables interactive user control of the gradient texture alignment and intensity transfer functions.Computer Graphics [I.3.3]Three Dimensional Graphics and RealismDisplay Algorithms Computer Graphics [I.3.6]Methodology and TechniquesInteraction techniques Computer Graphics [I.3.7]Three Dimensional Graphics and RealismColorshadingshadowingand texture