Y. Li's scientific contributions
Based on the deformation principle of rigid frame under force in FEM, a novel surface modeling method is proposed. A rigid frame is created according to topological relation of mesh, so the mesh surface deformation can be driven by rigid frame deformation. Two ways are introduced to get loads that urge rigid frame to deform, that is, directly exerting loads on nodes of rigid frame and adding geometric constraint interactively to get the inverse calculation of load. Aiming at geometric constrain deformation, a constrained optimization problem is established with minimization of external load and node displacement. In deformation process, the elastic modulus of elements associating with features of mesh is increased to preserve form feature. Compared with traditional method, sophisticate equations describing geometric feature information are avoided. Experimental results show that the method is straightforward and can generate desired deformation results.