[Insight-users] .vtk Output in ITK-3-2 not ParaView readable

[Luis Ibanez]

Hi Rakesh,


             Thanks for pointing this out.


We managed to replicate the problem that you reported,
and we are tracking down the origin.


In principle, the tag

         VECTORS vectors float

in the legacy VTK file is a valid description of the data.



We are suspecting that something downstream of the file
is the actual reason for the problem.



    We will keep you posted.



       Luis


---------------------------------------
Mullick, Rakesh (GE, Research) wrote:
> Hi Luis,
> 
> We have been using .vtk extension to write the deformation field and 
> when we switched from ITK-2-8-1 to ITK-3-2 we notice that 
> itkVTKImageIO.cxx (Line 480) has changed. The following now appears (in 
> ITK-3-2) to define the nature of the stored data:
> 
>   file << "POINT_DATA " << this->GetImageSizeInPixels() << "\n";
> 
>   if( this->GetPixelType() == ImageIOBase::VECTOR )
> 
>     {
> 
>     file << "VECTORS vectors "
> 
>          << this->GetComponentTypeAsString(m_ComponentType) << "\n";
> 
>     file << "LOOKUP_TABLE default\n";
> 
>     }
> 
>   else
> 
>     {
> 
>     file << "SCALARS scalars "
> 
>          << this->GetComponentTypeAsString(m_ComponentType) << " "
> 
>          << this->GetNumberOfComponents() << "\n";
> 
>     file << "LOOKUP_TABLE default\n";
> 
>     }
> 
> Whereas, in ITK-2-8-1 we only had the option available in the else clause:
> 
>     file << "SCALARS scalars "
> 
>          << this->GetComponentTypeAsString(m_ComponentType) << " "
> 
>          << this->GetNumberOfComponents() << "\n";
> 
>     file << "LOOKUP_TABLE default\n";
> 
> The outcome is that ParaView is unable to***___ correctly_* read the 
> field now. Can you please check on it and see how the itkVTK writer is 
> VTK Legacy compatible. The new code adds the line:
> 
> *VECTORS vectors******** float*
> 
> Instead of
> 
> *SCALARS scalar float 3*
> 
> For a typical deformation field which stores the deformation vector as 3 
> float scalar components.
> 
> Let me know if you need further clarification.
> 
> regards,
> rakesh
> __________________________________________________________________________
> *****Rakesh Mullick*, Ph.D., Senior Scientist*********** 
>              ****** EMail*: ___Rakesh.Mullick at ge.com_ 
> <mailto:Rakesh.Mullick at ge.com>
> 
> 
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