Point Cloud Segmentation by Distance

Hi everyone,
I am a beginner to MATLAB and I am doing a project which required a regular segmentation of 3D pointcloud. After some research, "Kd-Tree" may be one of the solution, is there anyway to implement "Kd-Tree" in MATLAB or there's another alternative for segmenting 3D point cloud into a regular cube? Thank you!
Something i imagine like this:

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Samatha Aleti
Samatha Aleti 2020-4-27

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It will result in circular searching radius. Any method to search in rectangular?

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