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Soft tissue deformation method based on mixing of gridding method and non-gridding method

A mesh-free, soft-tissue technology, applied in instrumentation, computing, electrical digital data processing, etc., can solve problems such as the calculation amount affecting the system running speed and affecting the real-time performance of the simulation

Active Publication Date: 2016-04-20
FUQING BRANCH OF FUJIAN NORMAL UNIV
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Problems solved by technology

However, the calculation amount of this scheme is too large, which will affect the running speed of the system, and then affect the real-time performance of the simulation.

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  • Soft tissue deformation method based on mixing of gridding method and non-gridding method
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  • Soft tissue deformation method based on mixing of gridding method and non-gridding method

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Embodiment Construction

[0051] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0052] A soft tissue deformation method based on mesh and meshless mixture of the present invention comprises the following steps,

[0053] S1: Use the collision detection algorithm to complete the confirmation of the meshless modeling position with variable regions;

[0054] S2: Establish a layer of mesh-free model according to the stored virtual soft tissue geometric connection topology information;

[0055] S3: Expand the meshless model that cannot cover the large deformation area in the deformation simulation and cannot meet the real effect;

[0056] S4: Repeat step S3 to complete the dynamic expansion of the region-variable meshless modeling area, form an N-layer meshless model, and establish a hybrid model that dynamically converts from mesh to meshless;

[0057] S5: Use a meshless model to model the local large deformation region...

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Abstract

The invention relates to a soft tissue deformation method based on mixing of a gridding method and a non-gridding method. The non-gridding method is adopted in a large-deformation region of an operation, and the gridding method is adopted in a non-operation region. By means of the non-gridding method in the operation region, the gridding deformation problem during large deformation can be avoided, deformation is in smooth transition so that deformation-simulated real sense can be achieved easily, meanwhile, the region model joint number is small while the operation region is small, and the real-time requirement can be met when the non-gridding method is adopted for the operation region; a particle-spring-based gridding deformation method is adopted in the non-operation region so that the defect that non-gridding calculation efficiency is low can be avoided, the advantages of a particle spring on real-time performance are given play to, meanwhile, because the non-operation region deformation is small, gridding deformation will not occur even a particle-spring method is adopted, and a deformation simulating effect is good. By means of the soft tissue deformation method, advantages of the gridding method and the non-gridding method in deformation simulation are given play to, the real sense and the real-time performance compromise, and the soft tissue deformation method is applicable to virtual deformation operation simulation.

Description

technical field [0001] The invention relates to the field of computer graphics, in particular to a soft tissue deformation method based on a mixture of mesh and meshless in virtual surgery. Background technique [0002] Traditionally, for example, soft tissue will undergo large deformation in the local area where the direct pressure of surgical instruments is applied. The method based on mesh deformation will cause mesh distortion in this large deformation area, which will affect the realism of deformation simulation. The meshless deformation technology method directly operates the large deformation area in the operation, because there is no mesh connection, no mesh reconstruction is required, and no mesh distortion will be generated. At the same time, it has the advantage of smooth transition deformation, which is suitable for large deformation area simulation; However, the calculation amount of gridless will greatly affect the running speed. If this method is used in the g...

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Application Information

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IPC IPC(8): G06T17/00G06F19/00
CPCG06T17/00G06T2210/41G16H50/50
Inventor 王娜
Owner FUQING BRANCH OF FUJIAN NORMAL UNIV
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