[vtkusers] Writing point cloud to .vtk using MATLAB

[Haluk Noyan Tokgozoglu]

Hi,

I have point cloud data in the form of 3 vectors, x y z which are n-by-1 and
contain the 3 coordinates of the points. I am trying to swiftly generate a
.vtk file in MATLAB so I can view it in Paraview, but I am having trouble
understanding the documentation at
http://www.vtk.org/VTK/img/file-formats.pdf

I have written some code, where I write the points as an unstructred grid,
but paraview doesn't show anything when I try to view the file.

Here's my code:

function [] = write_vtk(x,y,z)

    n=size(x);
    delete('data.vtk');
    fid=fopen('data.vtk','w');
    fprintf(fid,'# vtk DataFile Version 2.0\n');
    fprintf(fid,'blah\n');
    fprintf(fid,'ASCII\n');
    fprintf(fid,'DATASET UNSTRUCTURED_GRID\n');
    fprintf(fid,'POINTS %d float\n',n);
    for i=1:n
        fprintf(fid,'%f %f %f\n',x(i),y(i),z(i));
    end
    fprintf(fid,'POINT_DATA %d\n',n);
    fclose(fid);


end

What am I doing wrong?


Haluk Noyan Tokgozoglu

Johns Hopkins University
Computer Science PhD Student
Computational Interaction and Robotics Library
Secretary of the GRO
Treasurer of UPE
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