Non-Photorealistic Computer Graphics Library

Creating High Quality Hatching Illustrations

Author(s): Johannes Zander, Tobias Isenberg, Stefan Schlechtweg, Thomas Strothotte.
Technical Report: Department of Computer Science, Otto-von-Guericke University of Magdeburg, No. 12/2004, Germany, 2004.
[BibTeX]

Abstract:
Hatching lines are often used in line illustrations to convey tone and texture of a surface. In this report an approach for rendering hatched line drawings for polygonal meshes is presented.The proposed method allows the generation of hatching lines for interactive on-screen display as well as for vector-based printer output.We use local curvature information to compute streamlines on the surface of the model. A new algorithm ensures here an even distribution of the streamlines such that the visual quality of the final rendition is enhanced.These streamlines form the basis for the calculation of hatching lines. Line shading methods in general are presented that adapt the drawing to lighting conditions. To achieve interactive frame-rates the shading of the hatching lines is calculated at run-time using a virtual machine. For printer output a vector oriented format is generated.