An improved mass spring model based on internal point set domain constraint

Virtual surgery system aims to simulate the real surgery for doctor-training, while the soft tissue deformation is the one of the most significant part. To solve the lacks of object volume feature due to the problem that surface model defects in internal volume force together with the stability and real-time of the mass spring model, this paper proposes a mass spring model based on the internal point set domain constraint. First, this paper performs preprocessing, recording the information between adjoining points so the point search in further algorithm is easy to implement. The internal volume force interaction simulation is attained from establishing internal point set domain constraint, which guarantees the volume feature in deformation. Then, a dynamic deformation method is applied to update the deformed region on the surface based on internal point set domain constraint so the arithmetic speed is enhanced simultaneously. The experimental results show that the proposed method inherits the advantages of the traditional mass spring model while effectively conquers the defect in lacking the interaction of internal volume force and ensures the real-time superiority.