Project supported by the NSF CAREER Award (Nos. CCF-0448339 and DMS-0528363) of the USA;the National Natural Science Foundation of China (No. 60503067)
We give the topology changing of the silhouette in 3D space while others study the projections in an image. Silhou- ettes play a crucial role in visualization, graphics and vision. This work focuses on the global beha...