[vtkusers] Writing point cloud to .vtk using MATLAB

[Haluk Noyan Tokgozoglu]

Hi,

What are those scalar values supposed to denote?

Haluk Noyan Tokgozoglu

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



On Wed, Sep 14, 2011 at 12:21, rakesh patil <prakeshofficial at gmail.com>wrote:

> Hi,
>
> As mentioned in the pdf file
>
>
> http://www.vtk.org/VTK/img/file-formats.pdf
>
> There must be some scalar values for the POINT_DATA. Check for the example
> on page number 8 in that file. Your code only writes the x,y,z points in the
> file. Scalar values should follow after POINT_DATA.
>
> Hope that helps.
>
> Regards
> Rakesh Patil
>
> On Wed, Sep 14, 2011 at 9:08 PM, Haluk Noyan Tokgozoglu <htokgoz1 at jhu.edu>wrote:
>
>> 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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