Simulation modeling method of flexible body deformation supporting real-time pressing

Abstract

The invention discloses a flexible deformation simulation modeling method for supporting real-time pressing. The method includes the steps of initializing a virtual scene; detecting a position, wherein when a virtual agent crashes to any point on the surface of a virtual flexible body, giving the virtual touch pressure function; filling the inner part of an interactive partial zone of the virtual agent and the virtual flexible body by means of a combination spiral virtual model formed by laminating disk springs with different thicknesses; calculating the deformation in the partial zone of the virtual flexible body by the virtual model of the combination spring; refreshing images, continuously feeding back the touch information of an output force, and applying the information to the real-time deformation simulation process of the virtual man-machine interacted virtual flexible body. The modeling approach is simple in calculation, the deformation can be exactly and rapidly calculated, and the real-time deformation simulation of the flexible body can be realized; the force touch information returned to an operator is true, the soft tissue is vivid in deformation, and the man-machine interactive process is nature.

Description

technical field [0001] The invention relates to a force-tactile modeling method, in particular to a flexible body deformation simulation modeling method for real-time deformation simulation that supports real-time pressing. Background technique [0002] Studies have shown that nearly 80% of surgical errors in clinical medicine are caused by human factors, so surgical training is particularly important. However, in traditional training, the real surgical training mode is prone to medical accidents due to its high cost and high risk. Surgical training using physical objects such as cadavers, animals, or models is difficult to achieve the desired effect of actual surgical training, and virtual surgery simulation systems can effectively solve the problems in the above training methods, and are gradually occupying a major position in medical training. [0003] In the process of virtual force-tactile interaction, the modeling method of flexible body deformation simulation is the ...

AI Technical Summary

Problems solved by technology

Among the currently commonly used simulation modeling methods for flexible body deformation based on physical meaning, the spring-mass point has the advantages of simple modeling and low computational complexity, but the model has limited accuracy and is prone to distortion when the deformation is large

Finite elements can construct a more accurate model, but the calculation is relatively complicated, and when the number of network nodes is large, the interaction is poor

The modeling method based on the spherical harmonic function has a predictive function, and can well express the surface contour and details of the flexible body, but the geometric complexity that can be expressed is limited, and the running time is long

The layered diamond-shaped chain connection improves the modeling calculation speed and ensures the fidelity of the deformation effect, but does not conduct an in-depth analysis of the deformation amount of each particle on the boundary

Smoothed Particle Flow (SPH) has the advantages of simple calculation, easy implementation, and high real-time performance. It can meet the large-scale deformation of flexible bodies, but it has problems such as low stability and poor viscoelasticity.

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