Soft tissue deformation method based on metaball model driving

Abstract

The invention provides a soft tissue deformation method based on metaball model driving, which comprises the following four steps: a construction stage of a metaball model topological structure: generating a Voronoi diagram according to an original grid model by using a BradshowGareth ball tree generation algorithm, further generating a metaball model, and constructing the topological structure of the metaball model through a method of setting a threshold value; in the metaball model deformation calculation stage, an extended position dynamics algorithm is combined with Laplacian coordinate constraint to simulate the deformation process of the soft tissue body model; in the skin-covering stage of the soft tissue model, distance field functions of the metaball in the body model are established respectively, a mapping relation is established between the metaball model and the epidermis grid model, and the skin-covering process is achieved; and a realistic drawing and real-time tactile rendering stage: performing realistic drawing according to the physical deformation of the soft tissue, and performing real-time tactile rendering based on a GeomagicTouch force feedback device. The method can truly simulate the deformation process of the soft tissue in the virtual operation, and has the characteristics of strong physical reality sense and good real-time performance.

Description

technical field [0001] The invention relates to a soft tissue deformation method driven by a metaball model, which is used in the technical field of virtual surgery. Background technique [0002] With the continuous expansion and in-depth application of Virtual Reality (VR) technology in the medical field, virtual surgery (Virtual Surgery) and VR surgical simulators have attracted more and more attention. Virtual surgery technology has many advantages such as controllable surgical environment and instrument response, repeatable drills, etc., and has become the development trend of future surgical training. Doctors use VR surgical simulators for surgical training and planning, which can reduce the cost and risk of surgical training and treatment; reduce the dependence on animals and cadavers in doctor training and teaching; improve the skills and accuracy of clinical medical diagnosis and treatment; It can be popularized more quickly; it can also reduce the pain of treatment...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the authenticity problem of the traditional grid model and the iterative periodicity problem of the traditional physical method, provide a soft tissue deformation method driven by the metaball model, expand the position dynamics model, and achieve better deformation effect Good, such as better volume preservation, smoother surface after deformation, ensuring physical reality and real-time iteration, satisfying the reality of soft tissue rendering and real-time deformation iteration

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