Evaluation Of Lifelike Skin Deformation Method For 3D Virtual Human

Virtual human or computer synthesized characters is a representation of human body and behavior in a virtual environment generated by computer. With the more extensive application of virtual human in virtual reality, entertainment, surgical simulation, etc, real-time and lifelike display of virtual human become more and more important. The surface skin of virtual person is the body outer surface skin, and it is the most important and fine and complicated part of the virtual human, so the real-time lifelike deformation of skin is crucial to real-time and lifelike of virtual human.This paper is to classify the more successful four skin deformation into two classes named surface-model skin deformation and multi-layered-model skin deformation according to the geometric method and it gives assessment.Comparison and evaluation based on the surface model two algorithms generalized cross sectional method and generalized cross section of the body skin method of real-time lifelike deformation.Generalized cross sectional methods: all the vertexes in the arbitrary skin mesh are divided into groups according to given rule. Then we can gain smooth skin deformation by managing the generalized cross-section. This method can hold the details of the given skin mesh, and therefore obtain realistic deformation when virtual human is animated. The section is obtained in the standard state, so it is not applicable for any given model of virtual person.Method of body skin real-time deformation based on the generalized cross section: We refine the general cross-sectional contour method, based on which general cross-sectional contours were perfectly created according to the different features on different parts of human body. However, grouping regulations are complicated and we cannot make many sampling points by using interpolation joints adjustment, therefore it cannot meet the requirement of real-time.2) The two algorithms based on the multi-layered-model. The comparison and assessment of skin deformation of the limbs and simplified 3rd NFFD algorithm which is based on an error constrain of the virtual human anthropometry.The deformation of limbs skin within certain scope can satisfy the characteristics of real-time and lifelike, but it is not applicable to skin deformation of whole body.