How does matalb function pc2surfacemesh find a suitable spherical radius for ball-pivoting algorithm?

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I was recently learning about the algorithm for reconstructing point cloud into meshe, and I focused on an algorithm called ball-pivoting. Looking through some open source code libraries, such as open3d, I found that the key to this algorithm is to find the right radius of the sphere. pc2surfacemesh in matlab is the first function I found to provide the optimal radius calculation, but the official website does not introduce the principle of the algorithm. This is the official link to pc2surfacemesh : https://ww2.mathworks.cn/help/lidar/ref/pc2surfacemesh.html

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