How to format surface data into XYZ point cloud?
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I have a .csv data set that is 10x22 surface data and i'd like to convert it to XYZ point cloud. What is the best way to do this in Matlab?
3 个评论
Luna
2019-1-4
Could you please share your .csv file and what have you done so far?
Walter Roberson
2019-1-4
编辑：Walter Roberson
2019-1-5
to confirm you want a 3d pointcloud with 220 points ?
do you have the marginal coordinates , 10 y and 22 x?
Cris LaPierre
2019-1-4
What determines Z in your surface?
采纳的回答
Walter Roberson
2019-1-5
vector_of_x = as appropriate
vector_of_y = as appropriate
[X, Y] = meshgrid(vector_of_x, vector_of_y);
points = [X(:), Y(:), z(:)];
ptCloud = pointcloud(points);
3 个评论
Walter Roberson
2019-1-7
z = csvread('Example data.csv');
vector_of_x = 1:size(z,2);
vector_of_y = 1:size(z,1);
[X, Y] = meshgrid(vector_of_x, vector_of_y);
points = [X(:), Y(:), z(:)];
ptCloud = pointCloud(points);
Onur Kurum
2020-5-12
Hi,
I need to do the exact same thing but I don't have the Image Processing Toolbox. Is there a 'vanilla' way of doing this?
Walter Roberson
2020-5-12
pointCloud is part of the Computer Vision Toolbox
pointCloud() is a particular data type in MATLAB. If you do not have Computer Vision, then you cannot create the datatype, so it is not clear what you want to do? If you just want an array of three columns, X, Y, Z, and you are starting from a 2D array, then use the code I posted but stop after the assignment to points
更多回答（2 个）
Cris LaPierre
2019-1-4
0 个投票
If you can successfully create a surface with your data using surf(X,Y,Z), the best way to create an X,Y,Z point cloud is to use scatter3(X,Y,Z).
4 个评论
Walter Roberson
2019-1-4
surf permits vector x and y with array z. scatter3 requires vector x and y and z. If you have the marginal values then meshgrid or ndgrid to get array X and array Y and then work with X(:) Y(:) z(:)
Cris LaPierre
2019-1-4
Good point!
Don jaya
2020-4-9
I create a surface from the data i have. How to get the Z value of the surface with using only random x and y cordinates
Walter Roberson
2020-5-12
Don jaya, could you describe what your available inputs are, and what outputs you want?
flemingtb
2019-1-7
0 个投票
3 个评论
Cris LaPierre
2019-1-7
We can help you format it, but can you describe your data? How would you create a point cloud from your CSV data? Specifically, what would you X, Y and Z data be? Is your CSV the Z values and the column number your X and the row number your Y?
flemingtb
2019-1-7
Cris LaPierre
2019-1-7
See walter's answer.
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