Method of simulating angle bending model using position based dynamics

Abstract

The invention relates to a method of simulating angle bending model using position based dynamics. The method includes the steps of 1, making a grid model file of a deformable body to be simulated, and importing the grid model file into a deformable body simulation system; 2, defining variants of the grid model file of the deformable body; 3, according to Newton's second law and theorem of motion for particles, calculating a node prediction position p of a deformable body grid model after the deformable body grid model experiences an external force f<ext> for a time step Deltat; 4, building an angle bending model among nodes of the deformable body grid model; 5, outputting an image of the deformable body grid model at a node accurate position x, and using the node accurate position x as a node initial position of a next time step; 6, repeating the steps 3 to 5, and sequentially outputting images of frame of the deformable body grid model until simulation animation of bending deformation of the deformable body is obtained. The method has the advantages that the calculating process is easier, and calculation cost is reduced.

Description

technical field [0001] The invention belongs to the field of dynamic simulation based on physics in graphics, and in particular relates to a simulation method of an angle bending model based on positional dynamics. Background technique [0002] Much research has been done on how to model bending in computer graphics, especially in the field of cloth simulation. The traditional approach is to build springs between two spaced nodes in a regular grid to resist bending. PROVOT X. et al. used this bending spring model to simulate the bending behavior in "Deformation constraints in a mass-springmodel to describe rigid cloth behavior". They used a rectangular grid to simulate the cloth, and the nodes in the grid There is mass, that is, the spring mass model. Build a spring for two mass points in the vertical, horizontal and diagonal directions in the grid. The two mass points of the spring are separated by a node. This spring can be used to simulate the bending force of the cloth...

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: The present invention makes improvements to the problems existing in the above-mentioned prior art, that is, the technical problem solved by the present invention is that the calculation cost of the dihedral angle bending model in the existing position-based dynamics method is large, and the simulation effect is not ideal enough. limitations

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