Importing Point cloud to overlay on solid object

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Dhinu
Dhinu 2025-1-21
评论： Dhinu 2025-2-27
I would like to import point cloud data from metrology system into Matlab.
The datatype i have point cloud is in text/asc/spreesheet/can also be converted to matlab array
i would like to visualise these points and later place these on the solid step file object i imported earlier to see the diffrence between them.
i tried to use mesh function but i get these errors , so i tried to change the import type and it doesn't work .
Error in Test2 (line 3)
x = Experiment1coordinates.X; % All x values
^^^^^^^^^^^^^^^^^^^^^^^^
>> Test2
Error using mesh (line 71)
Z must be a matrix, not a scalar or vector.
Error in Test2 (line 6)
s = mesh(x,y,z,'FaceAlpha','0.5')
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  2 个评论
Mathieu NOE
Mathieu NOE 2025-1-21
if you have data in vectors (scattered data) , you must use scatter3 or trisurf
otherwise you must first create a 3d gridded array using meshgrid or ndgrid
William Rose
William Rose 2025-2-25
@Dhinu, provide an example of your data file or files, if you want more assistance.

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回答（1 个）

Walter Roberson
Walter Roberson 2025-2-25
You probably need to use scatteredInterpolant . In some cases the scattered data is an "unraveled" rectangular grid; in such cases you can reshape() the data to be a grid and then use griddedInterpolant
You might also consider https://www.mathworks.com/matlabcentral/fileexchange/63730-surface-reconstruction-from-scattered-points-cloud or https://www.mathworks.com/matlabcentral/fileexchange/51117-delaunay_surf or https://www.mathworks.com/matlabcentral/fileexchange/72090-tricont
  1 个评论
Dhinu
Dhinu 2025-2-27
i have the point cloud in the matlab now. I imported it as Csv file and used mesh function and later used pcshow to visualise the point cloud . but the point cloud is completely opposite to the actual surface since the point cloud was measured resting it on the surface horizontally, but the object is inverted 180 , how can i fit this when(i used pdeplot for importing the solid object)

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