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Lit-Sphere extension for artistic rendering
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AI
DOI：10.1007/s00371-013-0811-7.png)
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Abstract
En 中文
The Lit-Sphere model proposed by Sloan et al. (Proceedings of Graphics Interface 2001, pp. 143-150, 2001) is a method for emulating expressive artistic shading styles for 3D scenes. Assuming that artistic shading styles are described by view space normals, this model produces a variety of stylized shading scenes beyond traditional 3D lighting control. However, it is limited to the static lighting case: the shading effect is only dependent on the camera view. In addition, it cannot support small-scale brush stroke styles. In this paper, we propose a scheme to extend the Lit-Sphere model based on light space normals rather than view space normals. Owing to the light space representation, our shading model addresses the issues of the original Lit-Sphere approach, and allows artists to use a light source to obtain dynamic diffuse and specular shading. Then the shading appearance can be refined using stylization effects including highlight shape control, sub-lighting effects, and brush stroke styles. Our algorithms are easy to implement on GPU, so that our system allows interactive shading design.
Keywords:
Non-photorealistic rendering
Stylized rendering
Lit-Sphere
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