[Paraview] Viewing itk vector images with glyphs properly

[Floca, Ralf]

Hi

I am not sure, if it is better posted here or in the itk mailinglist,
because it mingels both. So please don't mind if it's ill posted.

I have generated itk images with itk::vector as pixel type (as e.g.
produced by itk::fem::FEMRegistrationFilter::GetDeformationField())

Afterwards I have saved this deformation fields as a meta image (*.mhd).
For saving the image I used the same code snippets like in chapter 7.8
of the itkSoftwareGuide 2.2.0.

When I load this meta image (2D image with 2D vectors) into ParaView, it
shows the norm of vectors. The components of the vector seems to be
available and correct, because in the "Edit Color Map" menu it has been
recognized as vector and I can choose to show single components of the
vector instate of the norm.

Now I want to visualize the vectors with a glyph filter. When I add the
glyph filter directly to the reader, the only available orient mode is
"Off", "Vector" is disabled and for "Scale Mode" there is only "Data
Scaling Off" available. As a result of this, I only have unsigned glyphs
instate of glyphs showing the deformation field.

The information given in a post with a similar topic
(http://public.kitware.com/pipermail/paraview/2004-February/000478.html)
didn't helped me, because I think I did everything as explained, but
wasn't able to properly setup the glyph filter.

I would be very thankful, if anybody could give me a clue what I did
wrong.

The header of a sample meta image is:
ObjectType = Image
NDims = 2
BinaryData = True
BinaryDataByteOrderMSB = False
TransformMatrix = 1 0 0 1
Offset = 0 0
CenterOfRotation = 0 0
ElementSpacing = 1 1
DimSize = 20 20
AnatomicalOrientation = ??
ElementNumberOfChannels = 2
ElementType = MET_DOUBLE
ElementDataFile = sample.raw

Best regards,

Ralf o Floca

---------------------------------------------------------------------
Ralf Floca
University of Heidelberg                           
Institute for Medical Biometry and Informatics
Department of Medical Informatics
Im Neuenheimer Feld 400            
D-69120 Heidelberg, Germany             Tel. : +49 (0)6221 56-7484  
http://www.med.uni-heidelberg.de/mi     Fax  :               -4997    
ralf_floca at med.uni-heidelberg.de        Sekr.:               -7483
---------------------------------------------------------------------