Tweakable shadows for cartoon animation

Hidehito Nakajima, Eiji Sugisaki, Shigeo Morishima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

The role of shadow is important in cartoon animation. Shadows in hand-drawn animation reflect the expression of the animators' style, rather than mere physical phenomena. However shadows in 3DCG cannot express such an animators' touch. In this paper we propose a novel method for editing the shadow with both advantages of hand drawn animation and 3DCG technology. In particular, we discuss two phases that enable animators to transform and deform the shadow tweakably. The first phase is that a shadow projection matrix is applied to deform the shape of the shadow. The second one is that we manipulate vectors to transform the shadow such as scaling and translation. These vectors are used in shadow volume method. The shadows are edited directably by integration of these two phases. Our approach enables animators to edit the shadow by simple mouse operations. As a result, the animators can not only produce shadows automatically but also reflect their style easily. Once the shape and location of shadow are decided by animators' style in our method, 3DCG techniques can produce consistent shadow in object motion interactively.

Original languageEnglish
Title of host publication15th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision 2007, WSCG'2007 - In Co-operation with EUROGRAPHICS, Full Papers Proceedings
Pages233-240
Number of pages8
Publication statusPublished - 2007 Dec 1
Event15th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision 2007, WSCG'2007 - Plzen, Czech Republic
Duration: 2007 Jan 292007 Feb 1

Publication series

Name15th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision 2007, WSCG'2007 - In Co-operation with EUROGRAPHICS, Full Papers ProceedingsWSCG Proceedings

Conference

Conference15th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision 2007, WSCG'2007
CountryCzech Republic
CityPlzen
Period07/1/2907/2/1

Keywords

  • Cartoon animation
  • Cel animation
  • Interactive techniques
  • Non-photorealistic rendering
  • Shadows

ASJC Scopus subject areas

  • Computer Graphics and Computer-Aided Design
  • Computer Vision and Pattern Recognition

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    Nakajima, H., Sugisaki, E., & Morishima, S. (2007). Tweakable shadows for cartoon animation. In 15th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision 2007, WSCG'2007 - In Co-operation with EUROGRAPHICS, Full Papers Proceedings (pp. 233-240). (15th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision 2007, WSCG'2007 - In Co-operation with EUROGRAPHICS, Full Papers ProceedingsWSCG Proceedings).