Local sharp feature generation and shape control of recursive subdivision surface

Local sharp feature generation and shape control of surface model are the fundamental issues of surface modeling in the field of CAD/CG. The basic principle of surface modeling based on static recursive approximating subdivision schemes is briefly introduced to deal with the arbitrary topological surface modeling. Method for generating local sharp feature on the subdivision surface by modifying the topological attribute of the vertices is presented. By means of pre-subdivision of the initial mesh, the shape of subdivision surface can be controlled by assigning different weights to the vertices of the initial mesh. The examples of complex surface modeling show that subdivision schemes have prosperous prospect in the field of CAD/CG.