stl to point cloud

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shmulik e
shmulik e 2020-4-10
评论： Ameer Hamza 2020-4-10
Hello
I have a STL file that i am tryongto convert to points clouid, or just the points cloud of the shell of the STL.
I tried differenf types of of STL reader function, but they all provide just the trigulation of the object wich includes faces and vertices, like the 'STL File Reader':
https://www.mathworks.com/matlabcentral/fileexchange/22409-stl-file-reader
The STL file was saved from SolidWorks by me, so i can save it in adifferent format if nedded.
Thank you for the help.

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-4-10
Use the stlread: https://www.mathworks.com/help/releases/R2020a/matlab/ref/stlread.html function provided in MATLAB from R2018b. To get the point cloud
stlData = stlread('stl_filename');
points = stlData.Points;
  2 个评论
shmulik e
shmulik e 2020-4-10
编辑：shmulik e 2020-4-10
This gives me only the points of the triangles. If there is a big face than they are very few points on that face, only the triangles points.
I want to have a shell of voulme point cloud which represent the STL and a I can control the density of the points.
for exmaple if i have a stl file of a cube, the TOP figure is what i will get from:
points = stlData.Points;
and the bottom two is what is want to have (either one of them, they generated just for an example)
Ameer Hamza
Ameer Hamza 2020-4-10
shmulik, This shows that the model saved in the STL file by SolidWorks just contains a few points. Is it possible to increase the use number of points in SolidWorks by using a finer mesh? Also run the following code to see if the points imported by MATLAB is same as the SolidWorks' model
stlData = stlread('filename.stl');
patchStruct.Vertices = stlData.Points;
patchStruct.Faces = stlData.ConnectivityList;
patchStruct.FaceColor = 'r';
patch(patchStruct)
view(3)

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