Meshless cloth-based simulation method

A simulation method and mesh-free technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem that the mesh-free model technology does not last long

Inactive Publication Date: 2011-01-12
陈玉君 +1
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Problems solved by technology

However, due to the fact that the technical time of the meshless model itself is not long, and the ap

Method used

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  • Meshless cloth-based simulation method
  • Meshless cloth-based simulation method
  • Meshless cloth-based simulation method

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Embodiment Construction

[0040] The cloth animation model has gone through the stage from the pure geometry stage to the stage based on the mechanics model. Its main applied models include discrete particle spring model and continuous finite element and finite difference model. Discrete particle spring model application technology has been around for about ten years, and it can also achieve relatively realistic animation effects. However, due to its dependence on spring parameters, it is difficult to obtain the mechanical properties of specified materials, which brings essential difficulties to the application. , for example clothing of different materials should not animate the same.

[0041] Therefore, the continuum model is a developmental necessity. The continuous model currently used is mainly a simplified finite element model, but due to the limitation of the mesh itself in the finite element model and the inherent characteristics of large deformation of cloth, the animation and mesh division o...

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Abstract

The invention relates to a meshless cloth-based simulation method. The method comprises the following steps of: (a) parameterizing a given cloth model omega onto a middle surface lambda and determining a configuration before deformation and a reference configuration when calculation is started; (b) selecting a limited number of nodes in the parameterized middle surface lambda and determining a local subdomain omega s of each node; (c) calculating a shape function phi I in a definition domain of each node and calculating a derivative of the shape function; (d) determining Gauss integral points of all nodes, calculating a numerical integral and assembling a stiffness matrix; (e) assembling a node mass matrix and a viscosity matrix; and (f) determining the number of cycles according to the simulation time t and the set time step interval delta t to cycle the following steps for t/delta t times: calculating a rotated global stiffness matrix, implementing constraints on the global stiffness matrix, the node mass matrix and the viscosity matrix, obtaining and solving a system linear equation set according to time integral to obtain nodal displacement, implementing meshless collision detection and a response algorithm to modify the nodal displacement, and generating the displacement of all sampling points of each time step after re-sampling.

Description

technical field [0001] The invention relates to the field of cloth simulation technology, in particular to a mesh-free cloth discrete method and a mesh-free cloth collision detection method. Background technique [0002] Physics-based cloth simulation has been widely used in virtual reality, computer animation and computer-aided design of textile industry. The cloth animation model has gone through the stage from the pure geometry stage to the stage based on the mechanics model. Its main applied models include discrete particle spring model and continuous finite element and finite difference model. [0003] The mass spring model has been widely used in cloth simulation because of its simple model and easy realization. The mass spring is a simple deformable model, which belongs to the discrete model. As its name suggests, the mass spring model simply includes the mass points and the springs connected to them, which together form the corresponding network. It can also achi...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 陈玉君苑维然
Owner 陈玉君
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