Apparent ridges for line drawing
Author(s): Tilke Judd, Frédo Durand, Edward Adelson.
Proceedings: SIGGRAPH '07: ACM SIGGRAPH 2007 papers, pp. 19, ACM,
2007.
[BibTeX] [DOI]
Abstract:
Three-dimensional shape can be drawn using a variety of feature
lines, but none of the current definitions alone seem to capture all
visually-relevant lines. We introduce a new definition of feature
lines based on two perceptual observations. First, human perception
is sensitive to the variation of shading, and since shape perception
is little affected by lighting and reflectance modification, we
should focus on normal variation. Second, view-dependent lines
better convey smooth surfaces. From this we define view-dependent
curvature as the variation of the surface normal with respect to a
viewing screen plane, and apparent ridges as the loci of points that
maximize a view-dependent curvature. We present a formal definition
of apparent ridges and an algorithm to render line drawings
of 3D meshes. We show that our apparent ridges encompass or
enhance aspects of several other feature lines.