Human Skin Simulation by Generating Wrinkles along Vector Fields by

In computer graphics, one of the important factors for rendering realistic human bodies is quality of skin. To improve this, it is necessary to represent small wrinkles on skin surfaces, which are locally oriented to certain directions. However, no method is developed to generate wrinkles over body parts like hands or arms, taking into account local directions. Thus, this paper proposes a method to generate wrinkles along the vector field assigned over the mesh which represents a body part. A vector field is obtained by interpolating the direction vectors which the user specified at some vertices of the mesh. A wrinkle pattern is generated by drawing along the vector field a number of line segments as wrinkle furrows, and by changing depth and width of the furrows depending on the magnitude of the vector field. The obtained wrinkle pattern is displayed using the bump mapping technique. An interface was implemented so that the user can easily edit a vector field, and it was shown that using the vector field whose assignment required relatively simple operations through this interface, the generated wrinkle patterns simulated the actual ones well.