Anistropic Cloth Modeling And Simulation

The simulation of fabric deformation has been a hot research topic in computer graphics since 1980. Mass-Spring system, which is easy to understand and implement, is widely used in Cloth Simulation. However, the model only considers the physical characteristics of isotropic fabric, and would easily leads to the super-elastic effect during the simulation, which would lower the reality of the simulation results. Considering the specific requirements of Cloth Simulation, this thesis analyzes the physical characteristics of the fabric, and uses an anisotropic cloth model, which is based on the classic Mass-Spring system, to meet the requirements. In the anisotropic model, we use the semi-rigid rods, take full consideration of the fabric tensile, compression, shear, bending and surface roughness, effectively solve the anisotropy and super-elastic issues of Cloth Simulation, and improve the reality of the simulation results.Cloth Simulation involves numerical integration of equation of motion and a large number of collision handling, which are the bottleneck of the simulation efficiency. In order to improve the efficiency and stability, we use the Verlet integration method, instead of the general explicit Euler in the numerical integration section. We also make a simplification in the collision model, only considering two types of collision model, "Point-Triangle" model and "edge-edge" model, to reduce the number of collision handling and speed up the calculation.Finally, a cloth simulation system based on the anisotropic cloth model, Verlet method and collision handling is developed. The simulation results of curtains under the constant wind and the drape of the table cloth shows that our system is able to effectively simulate fabric anisotropy and folds.