当发生接触时，表面通常通过接触面传播剪力和法向力。
When surfaces are in contact they usually transmit shear as well as normal forces across their interface.
引入了采样不足边界检测算法，通过检测采样不足区域的边界，去除边界处因法向估计不正确而出现的狭长的错误面片。
We introduce an algorithm to detect the undersampling patch in the input data and to avoid appearance of the wrong connected triangles around the boundary.
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