Soft tissue deformation and cutting simulation method based on position dynamics

A simulation method and dynamic model technology, which is applied in the field of soft tissue deformation and cutting simulation, can solve the problems of unstable reality and lack of deformation by geometric methods, and achieve the effects of improving authenticity and stability, real deformation, and high real-time performance

Active Publication Date: 2015-01-28
BEIJING UNIDRAW VR TECH RES INST CO LTD
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Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the lack of reality and instability of ge

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  • Soft tissue deformation and cutting simulation method based on position dynamics
  • Soft tissue deformation and cutting simulation method based on position dynamics
  • Soft tissue deformation and cutting simulation method based on position dynamics

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Embodiment Construction

[0042] figure 1 The processing flow of the soft tissue deformation and cutting simulation method based on positional dynamics is given, and the present invention will be further described below in conjunction with other drawings and specific embodiments.

[0043] The present invention provides a soft tissue deformation and cutting simulation method based on positional dynamics. The main steps are introduced as follows:

[0044] 1. Grid preprocessing

[0045] This method generates a simulation mesh for simulating deformation and cutting based on the input triangular mesh, tetrahedral mesh and dynamic parameters. The initial input is a triangular mesh containing texture information, which is stored in obj format. Polygon Triangulation is performed on the triangular mesh to obtain a tetrahedral mesh. This method makes the vertices on the tetrahedral mesh include the vertices of the triangular mesh. The resulting tetrahedral mesh includes vertex coordinates and vertex indices fo...

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Abstract

The invention provides a soft tissue deformation and cutting simulation method based on position dynamics. The method comprises the following four steps: grid preprocessing: according to an original triangular grid and a tetrahedron grid, and calculating a texture coordinate of each peak, calculating a set of edges in the grid, setting dynamics simulation parameters, and generating an improved tetrahedron grid; the deformation calculation of a soft tissue object: according to the current positions and the stressing situation of the peaks of the grids, calculating the positions of the peaks of the grids at a next moment according to the position dynamics; updating during grid topology change: according to an intersection situation of a cutting plane and grid intersection points, dividing an original tetrahedron, and updating the parameters of a geometric model and a position dynamics model; and visual rendering and touch rendering: displaying the soft tissue object and generating force feedback. The invention can truly simulate a process of cutting soft tissues in a virtual surgery, and exhibits high instantaneity.

Description

technical field [0001] The invention relates to a soft tissue deformation and cutting simulation method based on positional dynamics. Background technique [0002] With the improvement of computer hardware processing performance, surgical simulators based on virtual reality technology have been extensively studied. The deformation and cutting simulation is the key technology in virtual surgery. The simulation of soft tissue deformation and cutting mainly includes three aspects: the first is to use a suitable physical model for deformation calculation; the second is to deal with the coupling between the physical model and the geometric model during cutting; the third is the collision detection, force feedback and control of the system and other mechanisms. When designing deformation and cutting algorithms, the above three issues should be considered at the same time to ensure that the system has better real-time and authenticity. [0003] Cutting simulation is very critica...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 潘俊君白隽瑄赵鑫郝爱民
Owner BEIJING UNIDRAW VR TECH RES INST CO LTD
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