Tweakable Light and Shade for Cartoon Animation (R&D)

Light and shade in the context of non-photorealistic imaging, such as digital cel animation, are semantic notations, rather than physical phenomena. Therefore stylized light and shade should be intentionally animated instead of simulated. This project proposes an intuitive, direct manipulation method for animating stylized light and shade in real-time. Our method provides intuitive click-and-drag operations for translating and deforming the shaded areas, including rotation, directional scaling, splitting, and squaring of highlights, all without tedious parameter tuning. Our prototype system demonstrates the algorithms in our method, which are implemented along with a real-time cartoon shader on commodity graphics hardware. This system allows the interactive creation of stylized shading keyframes for animations, illustrating the effectiveness of the proposed techniques.

[DEMO Movies]　

operation examples (58.3MB)
The directional light is changed simply by dragging the shaded area on the apple. The rounded highlight is then continuously deformed by the drag operations, showing window reflection.

making a key-frame animation (24.8MB)
The highlight shape on the blue lampshade was originally similar to that on the green one. It was squared and then translated in real-time by the drag operations. The bottom window is used for setting key-frames.

[Publication]
Ken-ichi Anjyo , Shuhei Wemler , William Baxter ,"Tweakable Light and Shade for Cartoon Animation", In the proceedings of NPAR 2006, The 4th International Symposium on Non-Photorealistic Animation and Rendering, pp.133-139 (Annecy, France, June 7 2006)

Tweakable Light and Shade for Cartoon Animation

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