Fitting a cilinder to 3D vertices

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Alonso Figueroa
Alonso Figueroa 2018-5-29
评论： Walter Roberson 2020-5-31
I am having problems fitting a cylinder to a point cloud. Trying to use "pcfitcylinder", an error saying 'the value of 'ptCloud' is invalid. Expected ptCloud to be a pointCloud object' while the pointcloud is a nx3 created from the vertices of an .stl file. The code is:
Bone_model=stlread(fullfile(Bone_path,Bone_file));
maxDistance=.5
cilinder = pcfitcylinder(Bone_model.vertices,maxDistance);
pcshow (Bone_model.vertices);hold on;
plot(cilinder)
Is there anything i'm doing wrong?

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Walter Roberson
Walter Roberson 2018-5-30
stlread() appears to be one of the functions from the File Exchange, probably https://www.mathworks.com/matlabcentral/fileexchange/22409-stl-file-reader
The vertices returned by that stlread() function are configured for use by patch(). pcfitcylinder() requires that a pointcloud object be passed in.
You might be able to use
pc = pointcloud(Bone_model.vertices);
[cilinder,inlierIndices] = pcfitcylinder(pc, maxDistance);
cylpc = select(cilinder, inlierIndices);
pcshow(cylpc)
Note that pcfitcylinder attempts to find a subset of the pointcloud that is in the form of an cylinder.
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M.S. Khan
M.S. Khan 2020-5-31
Hi Danny,
could you please explain the coding to me. i also want to apply it on my problem.
Warm regards,
Walter Roberson
Walter Roberson 2020-5-31
M.S. Khan, which coding are you referring to? The only line of code that Daniel posted was
TalusPtCloud = pointCloud(Talus.solidVertices{1,1}, 'Normal', Talus.solidNormals{1,1});

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