Interactive Cloth Simulation System

With the quick development of E-commerce and web technology, more and more people choose to buy something which they need on the website. Purchasing on the website has become the fashion in China. About half of the customers have bought the cloths on the website. Now web shopping only show their clothe samples through explained words and pictures which can not meet the demand of the buyers on the website. If a kind of interactive cloth simulation system can be used on the website, it will bring great benefits to the buyers and the sellers. Meanwhile, it will lead to the much quicker development of purchasing on the website.Recent years, real-time simulation system has become the hotter topic on the area of computer graphics. Interactive cloth simulation system is an important research direction of simulation system. Interactive cloth simulation has been extensively applied in virtual fitting room, computer aided design, in-game animation and so on. Mass-spring model is usually adopted in cloth simulation system to simplify the cloth model. When the distance among the particles of cloth model is too long, cloth simulation system is possible to be unstable. To solve the problem, many methods have been proposed. There are two kinds of methods to solve the problem:one is the explicit integration method, the other is the implicit integration methods. With explicit integration methods, the time step must be very small for the system not to diverge. When the time step is too large, the system will be unstable; But when the time step is too small, the cloth model need more time to reach the balance of cloth simulation system. With implicit integration methods, even if the time step is too large, the cloth simulation is still stable. But implicit integration methods need more computing resource, it can not be used in the real-time cloth simulation system. In this paper improved Velocity-Verlet integration method is used to enhance the stability of cloth simulation system. Meanwhile, when the user interact with the cloth in the three-dimensional space through the mouse or keyboard controls, the cloth simulation system is still stable. In this paper C++ stl is also adopted to bulid the related list of the particles of cloth model, although the list of cloth model is difficult to build in the cloth simulation system.In order to attain more realistic effects on the interactive cloth simulation system, the lighting effects are computed by using OpenGL Shading Language in this paper. With the programmable graphics hardware, the simulation system can have better simulation effects and much faster than other methods. Collision detection between cloth models and body models is the bottle problem to improve the real-time of the cloth simulation system. A simple method has been proposed in this paper.