Soft body deformation models are commonly used in surgery simulations. However, cutting those models can have a severe impact on computation times and affects the interactivity of the simulation. We propose a novel method for modeling topology and introducing cuts in a meshless soft body simulated on a background grid, as well a way to progressively update the visual aspect of the object by adding a small number of triangles to the surface mesh to cover the cut area. We determine that the accuracy of the deformation is preserved after cutting by comparing our method to a finite element method. Tests show that this new method achieves interactive simulation rates with more than 10,000 elements while cutting the model and reconstructing the mesh. Our separation of the visual and physical aspects of the simulation allows for more flexibility when tuning the performance of the simulation. Topology modifications have little impact on computation times for either physical or visual changes.

中文翻译：

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在背景网格上变形的无网格模型的实时视觉和物理切割

软体变形模型常用于手术模拟。但是，切割这些模型会对计算时间产生严重影响，并影响模拟的交互性。我们提出了一种新的拓扑建模方法，并在背景网格上模拟的无网格软体中引入切割，以及通过向表面网格添加少量三角形以覆盖切割来逐步更新对象的视觉方面的方法区域。通过将我们的方法与有限元方法进行比较，我们确定在切割后保持变形的精度。测试表明，这种新方法在切割模型和重建网格时实现了超过 10,000 个元素的交互式仿真率。我们将模拟的视觉和物理方面分开，可以在调整模拟性能时提供更大的灵活性。拓扑修改对物理或视觉变化的计算时间几乎没有影响。