Line-art Illustration of Dynamic and Specular Surfaces

Yongjin Kim
POSTECH

Jingyi Yu
University of Delaware

Xuan Yu
University of Delaware

Seungyong Lee
POSTECH

ACM Transactions on Graphics (Proceedings of SIGGRAPH Asia), vol 27, no. 5, December 2008

Abstract

Line-art illustrations are effective tools for conveying shapes and shading of complex objects. We present a set of new algorithms to render line-art illustrations of dynamic and specular (reflective and refractive) surfaces. We first introduce a real-time principal direction estimation algorithm to determine the line stroke directions on dynamic opaque objects using neighboring normal ray triplets. To render reflections or refractions in a line-art style, we develop a stroke direction propagation algorithm by using multiperspective projections to propagate the stroke directions from the nearby opaque objects onto specular surfaces. Finally, we present an image-space stroke mapping method to draw line strokes using the computed or propagated stroke directions. We implement these algorithms using a GPU and demonstrate real-time illustrations of scenes with dynamic and specular 3D models in line-art styles.

BibTex

@article{kim08_lineart,
  author = {Yongjin Kim and Jingyi Yu and Xuan Yu and Seungyong Lee},
  title = {Line-art Illustration of Dynamic and Specular Surfaces},
  journal = {ACM Transactions on Graphics (SIGGRAPH ASIA 2008)},
  year = {2008},
  month = dec,
  volume = {27},
  number = {5}
}