Turn a X Y Z matrix into a point cloud

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Sushmitha Kudari
Sushmitha Kudari 2020-2-21
评论： Adam Danz 2021-1-12
I have a matrix as follows for example where the first column is X coordinate, second column is the Y coordinate and third column is the Z coordinate. How can i turn this matrix into a point cloud with pcwrite and pcshow? It has to be in a point cloud format.
[1 8 9; 2 3 4; 9 8 6]
  1 个评论
Adam Danz
Adam Danz 2021-1-12
Ran in:
xyz = [1 8 9; 2 3 4; 9 8 6];
ptCloud = pointCloud(xyz)
ptCloud =
pointCloud with properties: Location: [3×3 double] Count: 3 XLimits: [1 9] YLimits: [3 8] ZLimits: [4 9] Color: [] Normal: [] Intensity: []
pcshow(ptCloud,'MarkerSize',1000)

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回答（3 个）

Image Analyst
Image Analyst 2020-2-21
Try
plot3(x, y, z);
or
scatter3(x, y, z);
or, if you have a surface rather than a cloud
surf(x, y, z);
  2 个评论
Sushmitha Kudari
Sushmitha Kudari 2020-2-21
I have to have it in a point cloud format for when I export it.
Image Analyst
Image Analyst 2020-2-22
I never heard of it but I guess Hiroki has and it seems there is a function to put it into that class. Then you can export it somehow, like using save() to put it into a .mat file. What program are you exporting it for? What program will use this data that you exported? Does that program know how to read in .mat files? If not, what formats does that program know about?

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the cyclist
the cyclist 2020-2-21
xyzPoints = [1 8 9; 2 3 4; 9 8 6];
ptCloud = pointCloud(xyzPoints);
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Hiroki Okawa
Hiroki Okawa 2020-2-21
can you please show the error messages?
Sushmitha Kudari
Sushmitha Kudari 2020-2-21
There is no error message but the plot is a linear line which is incorrect. It is supposed to be topography map.

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Hiroki Okawa
Hiroki Okawa 2020-2-21
编辑：Hiroki Okawa 2020-2-21
I think that pcshow function will woks
pcshow([1 8 9; 2 3 4; 9 8 6])
By the way, you can convert xyz matrix into point cloud format by pointCloud function
https://www.mathworks.com/help/vision/ref/pointcloud.html
ptCloud = pointCloud(xyzPoints)
in this case,
ptCloud = pointCloud([1 8 9; 2 3 4; 9 8 6])

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