Interactive Stylized Silhouette for Point-Sampled Geometry
Author(s): Nordin Zakaria, Hans-Peter Seidel.
Proceedings: 2nd international conference on Computer graphics and interactive techniques in Austalasia and Southe East Asia, pp. 242--249,
2004.
[BibTeX] 
Abstract:
Silhouette is a drawing feature that is popular in illustrations and
line-drawing artworks and is an important focus of research in
the field of Non-Photorealistic Rendering (NPR). Current work
on silhouette extraction and rendering tends to assume a
polygonal mesh input, where connectivity information is available
and the formation of silhouettes involves tracking of edges. On the
other hand, the availability of 3D scanning devices nowadays
leads to the proliferation of dense point data set for which no
connectivity information is initially available. We present in this
paper a hybrid image/object-space method to directly detect and
render stylized silhouettes for such data set. Our method is
simple to implement and runs at an interactive frame rate. Its
basic form involves rendering silhouette points, each with a
unique color value, to a color buffer. We show how lines can then
be quickly fitted to the points projected. We further show how
stylized silhouette can be used effectively with two other NPR
techniques that happen to work very naturally with pointsampled
geometry: stippling, and direct drawing onto surfaces.