Sung-Soo Kim, Seung-Keol Choe

       Spatial Information Technology Center,
            Computer & Software Research Laboratory,
            Electronics and Telecommunications Research Insititute,
            161 Gajeong-dong, Yuseong-gu, Daejeon, 305-350, Republic of Korea 


     Silhouette information has been used to enhance artistic rendering of 3D objects.We present a new method for progressive silhouette rendering of triangle mesh of arbitrary topology by using parameterized brush functions in various styles.
The proposed progressive silhouette rendering framework is consist of two major steps; one is mesh simplification for silhouette feature preservation and the other is the stylized silhouette edge rendering. We also improve the mesh simplification algorithm that can preserve silhouette and volume of arbitrary mesh for silhouette rendering. First, for a given mesh, we can obtain progressive mesh(PM) through our proposed mesh simplification algorithm at the preprocessing step. Then, we can render silhouette edges by various kinds of effects progressively by performing the refinement of a given PM from a base mesh.
Results demonstrate that progressive silhouette rendering which use the progressive mesh and brush functions can cause effect that a person sketches an arbitrary object gradually.

Keywords: non-photorealistic rendering, mesh simplification, progressive sketching, silhouette rendering