STL to Point cloud or Alpha shape
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Alec York
am 29 Dez. 2017
Kommentiert: Alec York
am 23 Aug. 2018
Hello, I was wondering if there was a way to convert an imported STL file to a 3D point cloud or alpha shape. Thanks
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Joe Murphy
am 2 Jan. 2018
Hello Alec,
After importing an STL file to MATLAB (using any preferred method, such as the 'importGeometry' function), you can use the 'alphaShape' function to create a three-dimensional alpha shape using the geometric data imported from your STL:
shp = alphaShape(x,y,z)
where 'x', 'y' and 'z' correspond to the points of the shape in each dimension. In addition, if you have access to the Computer Vision System Toolbox, you can simply use the 'pointCloud' function to create a point cloud:
ptCloud = pointCloud(xyzPoints)
where 'xyzPoints' is a matrix with the x y and z point locations retrieved from your STL. You can read more about these functions and see some examples in the documentation below:
https://www.mathworks.com/help/matlab/ref/alphashape.html?s_tid=srchtitle
https://www.mathworks.com/help/vision/ref/pointcloud-class.html?s_tid=srchtitle
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Atia Najafi
am 23 Aug. 2018
Bearbeitet: Atia Najafi
am 23 Aug. 2018
Hello Joe, can you please expand your answer? my problem is that after I imported stl file, do not know how create point cloud, how should define x, y ,z in following code, do not know what is wrong with it any help is appreciated
model = createpde(3);
>> importGeometry(model,'Part1.stl');
>> shp = alphaShape(x,y,z)
Undefined function or variable 'x'.
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