Point cloud with Matlab

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QS
QS 2019-2-20
评论： Walter Roberson 2025-3-28
How to divide a point cloud in four quadrants? Please help me with the code in matlab.
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Walter Roberson
Walter Roberson 2025-3-28
Use pca() to find the orientation of the planes, and use the centroid of the point cloud as the center of the planes

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Dev
Dev 2025-3-28
Hi @QS,
To divide a point cloud into four quadrants, we can loop through each point using a ‘for’ loop and assign it to a quadrant. I have added a reference code snippet below which can be used inside this loop to help us achieve the same-
% Assign each point to the respective quadrant
if x >= origin(1) && y >= origin(2)
quadrant1 = [quadrant1; x, y]; % Quadrant I
elseif x < origin(1) && y >= origin(2)
quadrant2 = [quadrant2; x, y]; % Quadrant II
elseif x < origin(1) && y < origin(2)
quadrant3 = [quadrant3; x, y]; % Quadrant III
else
quadrant4 = [quadrant4; x, y]; % Quadrant IV
end
To visualize the point cloud, we can use the ‘scatter’ function in MATLAB. I have attached an example output of a point cloud divided into quadrants below, for your reference.
For more information regarding the usage of the ‘for’ loop and the ‘scatter’ function, please refer to the documentation links below-
for- https://www.mathworks.com/help/releases/R2024b/matlab/ref/for.html
scatter- https://www.mathworks.com/help/releases/R2024b/matlab/ref/scatter.html
Hope this solves the query.

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