Research On Dynamic Simulation Method Of Fabric By Isogeometric Mass-Spring Model

The virtual try-on technology based on dynamic simulation of cloth has a wide range of applications in textile engineering,3D animation and e-commerce,etc.With the rapid development of e-commerce,more and more people buy clothing online.The virtual nature of the Internet itself makes the clothing that users buy often cause problems such as high return rate due to the unsuitable size of the clothing.To solve this problem,the best solution is to design a real-time,efficient and realistic virtual fitting system.For this reason,the graphics industry has been continuously exploring and researching for many years.Many effective cloth simulation methods have been proposed,but it is very difficult to meet the requirements of real-time and high efficiency in virtual fitting.Furthermore,the isogeometric analysis method used in this paper is a new numerical simulation method that can realize the seamless fusion of geometric design and simulation data.It has high precision and computational efficiency in various numerical simulation problems.For the current cloth simulation method,there are some problems,such as the inaccurate geometric expression of the triangular mesh model,and separation of product modeling and simulation,etc.Based on the idea of isogeometric analysis,this paper takes the real-time and high-efficiency as the research goal,and deeply explores and studies the dynamic simulation of fabric.The details are as follows:1.Dynamic simulation method of fabric based on the isogeometric analysis.In order to simulate the dynamic fabric in real time,a dynamic simulation method by isogeometric analysis is proposed.Firstly,tensor product Bezier surface is used to construct the fabric geometric model;then the mechanics analysis is performed on the mass point of the fabric,and mass-spring model is numerically solved directly on the surface;finally,the position and velocity of the updated mass points are transformed to the control points of the isogeometric fabric surface,and collision detection is performed in real time.Experimental results show that the proposed method does not need to perform triangulation on the fabric surface,and can represent the fabric geometry exactly;furthermore,high-precision dynamic simulation results can be achieved with a small number of degrees of freedom,and the simulation efficiency is improved.Real-time dynamic simulation is performed in CPU simulation environment,which is suitable for engineering applications such as virtual try-on with high real-time requirements.2.Dynamic simulation of fabric based on triangular B-B surface.How to realize the simulation and splicing of different fabric patches is of great significance for the construction of complex garments.Aiming at this problem,a fabric simulation method based on triangular B-B surfaces is proposed.It considers that in the dynamic simulation of the cloth,each mass on the boundary is affected by the surrounding mass points.Firstly,the subdivision method is used to calculate the boundary control mass points of the triangular B-B surface;Secondly,a small number of masses are controlled by a triangular mass-spring model to simulate the global deformation effect of the fabric;Finally,seamlessly splicing the triangular fabric surface with the quadrilateral fabric surface.The experimental results show that there are no singular situations such as sharp points in the stitching boundary of the fabric during the simulation.This method is smoother in the geometric expression of the fabric,and the simulation effect is better.The hybrid modeling of the triangular B-B surface and quadrilateral surface can construct almost an arbitrarily shaped cloth surface,which is suitable for constructing complicated garment modeling.