Research On 3D Textile Simulation

Textile simulation technology is mainly about computer animation for vision effect and static or dynamic attributes of flexible fabric fashion. Different textile material and weaving structure have been simulated and displayed for many decades, while it is a newly born study in the world to simulate 3D textile material and weaving structure. Most researchers turn to finite element methods, and proper results occur accordingly. But they fail to resolve the important problem of these finite elements methods, i.e., massive calculation. Textile style simulation began from an early stage in textile research field. While in computer graphic field, it was the focus of researchers in the middle of 1980s. The typical reference is written by Weil Jerry, who proposed a method to represent 3D textile vision effect when it is hanging under some certain forces. Recently, textile virtual simulation is mainly concerned with illumination process and texture mapping, from which most detailed attributes can be displayed efficiently, such as wrinkle, drapping, and texture. These techniques may be capable of simulating one or two certain attributes on textile surface. Aiming at simulating 3D textile material and weaving structure, this study proposes some fast and efficient algorithms to realize 3D textile dynamical display effect. Its content mainly consists of textile static and dynamic simulation. The former pays more attention to 3D textile geometrical and illumination model, and the latter realizes simulating of textile flagging in the wind. This method will contribute to simulating and displaying 3D textile material and weaving structure.When textile 3D model, based on its weaving structure, and vision effect are concerned, this study employs some 3D algorithms according to its material attributes. In recent years, 3D object illumination effect is often realized with Phong illumination model, which is used to deal with those materials with smooth instead of coarse surface. Considering that most surface of textile is not smooth, some improvements have to be made when Phong illumination model is applied in textile simulation. In this study, Phong illumination model, integrated with BRDF model, is proposed to simulate textile dynamics. The former model is used to simulate textile 3D geometrical structure, and the latter to simulate its weaving structure. Improvements have to be made on the two models depending on textile detailed feature. Certain parameters are possible controlled so as to apply these two illumination models in 3D textile material. Meanwhile, parametrical relationship between them is also found out. Thus, we can realize the simulation and display for textile weaving structure and 3D geometrical model.The focus is upon simulating woolen fur when talking about 3D model and vision effect of woolen textile material microcosmic attributes. According to different woolen textile surface attributes, the simulation for woolen textile material and weaving structure can be realized easily by integrating regularity and randomization of the textile light intensity. A novel mapping synthesize method is proposed as the main technique to realize woolen textile simulation. It is able to represent texture and fuzz of the woolen textile efficiently and vividly. Firstly, the geometrical and illumination model of the wool is simulated except for the fur, which may be simulated in the next step. When the wool and fur being simulated efficiently, the vision effect of fuzz is mapping synthesized into that of wool yarns.The wind noise and Perlin noise are taken as the basic equations when we apply 1/f noise theory in 3D textile dynamic simulation. The motion equation can be built to simulate textile dynamics by statistical method. With an efficient algorithm instead of any iteration, the process has a fast speed and can simulate textile dynamics in real time when it is flagging in the natural wind.Signal modulation method is used to simulate textile flagging in the wind. In this method, the wind noise is possible made some improvement when it is used to simulate 3D textile dynamics. Stochastic signal functions are used to represent textile flagging in the wind. We consider two kinds of influences on textile motion, which are the wind force and textile material. The influences of textile material and the wind force are represented by different frequencies of the stochastic functions. 3D textile dynamic simulation is realized eventually by integration of these functions with an amplitude modulation method. The stochastic functions are mainly sine wave functions whose amplitude is changing continuously. Thus, the shape of textile flagging in the wind can be obtained by such sine wave functions. The characteristic of textile swaying in the wind can be displayed efficiently and vividly. The algorithm has a fast speed, and different results can be obtained easily by selecting different textile materials.Although it's a common topic to simulate and represent different textile material and weaving structure, few studies show that it is promising thoughout the world to simulate 3D textile material, and weaving structure.These methods mainly pay more attention to the finite element iteration algorithm. Despite of some simulation display effects being obtained, they fail to overcome the problem of numerous calculations. Based on texture mapping, a research on 3D textile visual effect proposes different efficient and fast algorithms. Some better results can be achieved when the algorithms,metioned above, are adopted to simualte 3D textile material and weaving sturcture. The simualtion for textile material and weaving sturcture can form the technology support to 3D garment dynamic display.This research includes two components: static and dynamic simulation. To begin with, 3D textile texture mapping is done to simulate the 3D textile structure. From the microscopic view point, a novel illumination model can be built to synthesize the textile material feeling and weaving structure. The 3D simulation of textile material such as woolen can be realized. Furthermore, in order to simulate 3D effect of the textile dynamic motions, the 3D textile shape's functions are defined on the basis of the noise theory. It makes,on the basis of fast simulation, the further research possible to simulate the deformation of textile in motion. The final work is to make a detailed plan of the further research, in which the 3D textile simulation, based on texture mapping, is applied to the field of 3D garment display. In order to discuss the further work, we try to simualte the clothes' illumination and wrinkles of a virtual humman. By sampling method, its net points is built to form the framework. A cone curved suface is used to form the clothes geometryic outline. The simulation of clothes wrinkles of the mannequin is easily realiezed with the method of illumination technology in the static simulation.To start from the simulation for 3D textile dynamics on the basis of texture mapping, this research employs a efficient and fast algorithm, based on which the theory of 3D textile texture mapping is possibly formed, and the computere graphic virtual reality technology is promoted.Textile dynamic simulation may also be realized by physical model and signal synthesis method. The influence of different wind forces on textile dynamics is possible done with synthesis of physical functions and the textile dynamic model built by wind noise theory. The forces upon textile, when it is motionless, can be simulated with the proposed physical model. Synthesizing the physical model and signal, we can obtain the simulation results of the textile flagging in the wind. The textile basic shape equation is defined by the forces analysis from macro point of view. Therefore, when forced by different wind strength, textile dynamic simulation is done by synthesis of stochastic functions and physical model.Textile pattern deformation is simulated with the improvement genetic algorithm. The textile pattern style must be various when it is flagging in the wind. As the structure of textile is conformed to a certain kind of regularity, the deformation of textile pattern can be realized with iteration method. Some improvements have to be made upon the traditional genetic algorithm. The gene of child generation is derived from that of his parent and his parent's adjacent points. The definition of mutation proposes the cause for mutation is that there are some outsides forces upon the point simulated. And it also presents the deformation equation of the mutated points on its curved surface.The fitness function is built in simulating textile with the improved genetic algorithm. In the traditional genetic algorithm, some certain attributes of textile can be simulated by iteration method and some good results occur. However, the fitness function cannot be adjusted according to different iteration results. The convergence is formed only after numerous iteration times. In order to speedup, we have to reduce the iteration times depending on different computer calculations processing with the result that the results must be deteriorated. This study makes some improvements upon the fitness function. Integrated with textile attributes, an inherited fitness function algorithm is proposed. In iteration, the convergence and population number of the genetic algorithm are calculated statistically. The fitness function may be adjusted and optimized by stochastic method. Thus, the iteration time is reduced a lot and the results are fast and efficient. Taking one type of textile as an example, the difference in display effects and simulation speed between the traditional and improved genetic algorithms is clearly proved.The further research of this study is outlined briefly. We will apply the 3D textile simulation based upon texture mapping in fashion display. The further research is illustrated by analysis the display effect of the illumination model and wrinkle attribute of a virtual human when he is addressed. The human framework is built and his clothes surface is substituted with cone curve surface. The wrinkle attribute can be simulated with the illumination model is adopted the one that we built in textile static process.This research includes two components: static and dynamic simulation. To begin with, 3D textile texture mapping is done to simulate the 3D textile structure. From the microscopic view point, a novel illumination model can be built to synthesize the textile material feeling and weaving structure. The 3D simulation of textile material such as woolen can be realized. Furthermore, in order to simulate 3D effect of the textile dynamic motions, the 3D textile shape's functions are defined on the basis of the noise theory. It makes,on the basis of fast simulation, the further research possible to simulate the deformation of textile in motion. The final work is to make a detailed plan of the further research, in which the 3D textile simulation, based on texture mapping, is applied to the field of 3D garment display. In order to discuss the further work, we try to simualte the clothes' illumination and wrinkles of a virtual humman. By sampling method, its net points is built to form the framework. A cone curved suface is used to form the clothes geometryic outline. The simulation of clothes wrinkles of the mannequin is easily realiezed with the method of illumination technology in the static simulation.