Reproduction of perspective in cel animation 2D composition for real-time 3D rendering

Takeshi Okuya, Shigekazu Sakai

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

Abstract

Many 2D cel animations and 3DCG cel-style animations are still being actively produced in Japan. Cel animation has its own perspective, which is different from general 3D space. In this paper, we focus on the perspective generated by the compositing process and reproduce it by moving the vanishing point and adjusting the perspective strength. In the proposed method, we modify the projection matrix. This makes it possible to change the appearance of the 2D shape in real-time without changing the 3D shape of the model. The user controls the matrix using three 3D points called the vanishing guidance point, virtual viewpoint, and model focus point. A matrix is generated for each model. In addition, to operate the proposed method with the current major shading algorithms, we provide modified shadow mapping and rim lighting methods. Furthermore, we consider effective hierarchical structures for using the proposed method in general computer graphics software. The results confirm that this method reproduces the features of cel animation. Moreover, they show that the processing speed achieves the performance required for use in real-time rendering.

Original languageEnglish
Title of host publicationProceedings - CVMP 2019
Subtitle of host publication16th ACM SIGGRAPH European Conference on Visual Media Production
EditorsStephen N. Spencer
PublisherAssociation for Computing Machinery, Inc
ISBN (Electronic)9781450370035
DOIs
Publication statusPublished - 2019 Dec 17
Event16th ACM SIGGRAPH European Conferenceon Visual Media Production, CVMP 2019 - London, United Kingdom
Duration: 2019 Dec 172019 Dec 18

Publication series

NameProceedings - CVMP 2019: 16th ACM SIGGRAPH European Conference on Visual Media Production

Conference

Conference16th ACM SIGGRAPH European Conferenceon Visual Media Production, CVMP 2019
CountryUnited Kingdom
CityLondon
Period19/12/1719/12/18

Keywords

  • Anime
  • Hand-drawn animation
  • Perspective strength adjustment
  • Rim light
  • Shadow mapping
  • Vanishing point movement

ASJC Scopus subject areas

  • Visual Arts and Performing Arts

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