Abstract: In order to improve local deformation quality of 3D human body model in motion, a local human body mesh deformation method combining bounded biharmonic weights with dual quaternion blending skinning is proposed. Firstly, the 3D human body model is tetrahedralized. Then the bone control unit of the model is set up. Next, the bounded biharmonic weights of each bone control unit for the movement deformation of each vertex in the human body local model is calculated by minimizing the sum of Laplacian energy and the boundary constraints of the weight setting. After that, the mesh vertexes of the 3D human body model are bound to the bone control unit, and the motion parameters of each bone control unit are converted to double quaternions. Finally, in the double quaternion operation space, the motion deformation of the 3D local model driven by bone control units is calculated with the bounded biharmonic weights, in order to achieve the blending skinning combining the dual quaternion with the bounded biharmonic weights in motion state. The experimental results show that this method enables the local model of 3D human body to be more smoothly and more naturally deformed in motion.

Key words:  mesh deformation, bounded biharmonic weights, dual quaternions, skinning, human body model