Skeleton Driven Mesh Deformation Based on Rigid Frame in FEM

Using the deformation principle of rigid frame under force for reference,linear elastic FEM is applied to realize deformation design of mesh model.Combining skeleton-driven biological motion with linear elastic FEM,an efficient deformation algorithm is proposed based on finite element shape function interpolating.Firstly,the rigid frame is constructed by building low-solution skeleton of the original mesh.Secondly,the map between mesh vertices and beam is established to realize skeleton-driven mesh deformation.Thirdly,through adding boundary conditions and exerting external load interactively,node displacement could be calculated by solving global stiffness matrix equation.Lastly,displacement vector of mesh vertices are computed out by interpolating node displacements with shape function.Owing to the limitation of linear FEM in large deformation problem,a rotating field is established to modify this drawback and the cubic Hermite interpolation is introduced to interpolate two ends of deflection curves at common node to realize smooth deformation results.Experimental results show this algorithm is effective and can be applied to model deformation such as expanding,bending,rotating and other operations.