[Paraview] Feature Request: vtkImageResample

[Bryn Lloyd]

Hi,

I have tried it in a similar way with no success.


It works though using following Set-methods:

//----------------------------------------------------------------------------
void vtkImageResample2::SetOutputSpacing(double v[3])
{
   this->SetOutputSpacing(v[0],v[1],v[2]);
}

//----------------------------------------------------------------------------
void vtkImageResample2::SetOutputSpacing(double v0,double v1,double v2)
{
   this->SetAxisOutputSpacing(0,v0);
   this->SetAxisOutputSpacing(1,v1);
   this->SetAxisOutputSpacing(2,v2);
}



With standard xml description:

       <DoubleVectorProperty
          name="OutputSpacing"
          command="SetOutputSpacing"
          number_of_elements="3"
          default_values="0 0 0" >
       </DoubleVectorProperty>



I have place the code here:

http://www.vision.ee.ethz.ch/~blloyd/vtkImageResample2/



This seems to work (extent is changed say for MagnifactionFactos="0.5 
0.5 1.0"). But the image data becomes invisible. I think it converts the 
PointData->Arrays to some other form, e.g. image scalars or something, 
which paraview doesn't display.


--Bryn










Jérôme wrote:
> Hi,
> 
> I tried to do what you talked about, because I need isotropic volumes
> for a number of algorithms. I think it is the same for you, right?
> 
> I wrote an xml file that you can load in the plugin manager menu,
> according to this wiki page:
>    http://paraview.org/Wiki/Plugin_HowTo#Enabling_a_filter_in_VTK
> 
> The problem is that the VTK filter seems not to be paraview-compliant:
> it didn't work, but unfortunately I didn't have time to describe the
> bugs. I joint the xml file, so that you can try and please tell me if
> it works for you -then I may guess it is because of my settings...-.
> 
> In a nutshell, here are my problems for a volume of spacing 0.5x0.5x1
> that I want to be 0.5x0.5x0.5 ie magnification factor = 0.5 on axis z
> (= 2)
> - The filter updates, but the extent does not change in the output
> - When representation of input is 'Slice', the output dimensionality is 2 !!!
> 
> I hope someone could find the mistake, wherever it comes (my xml,
> paraview, or VTK)
> 
> I also write a Cxx class that inherites from vtkImageResample and
> computes automatically the magnification factor depending on a
> user-chosen reference axis (in my example, x or y). Today, I use an
> independent executable that converts an input mhd file into an
> isotropic volume, and then I open it in paraview. I would be glad if
> this step is part of a paraview pipeline, but my inherited class has
> the same behaviour than vtkImageResample (and I think that when I
> tried with the parent class vtkImageReslice, the same problem
> occured...).
> 
> Jerome
> 
> 2009/1/30 Bryn Lloyd <blloyd at vision.ee.ethz.ch>:
>> Dear VTK Developers
>>
>>
>> I would like to use the vtkResampleImage class in Paraview (plugin). For
>> this purpose it would be helpful if in addition to the methods
>>
>> SetAxisMagnificationFactor (int axis, double factor)
>> SetAxisOutputSpacing (int axis, double spacing)
>>
>>
>> which are valid for axis 0,1 and 2, following new functions could be added:
>>
>> SetAxisMagnificationFactor (double, double, double)
>> SetAxisOutputSpacing (double, double, double)
>>
>>
>> i.e. taking values for all three axis directions simultaneously.
>>
>>
>> Could this be done?
>>
>>
>> Thanks in advance!
>>
>> Bryn
>>
>>
>>
>>
>> --
>> -------------------------------------------------
>> Bryn Lloyd
>> Computer Vision Laboratory
>> ETH Zürich, Sternwartstrasse 7
>> CH - 8092 Zürich, Switzerland
>> Tel: +41 44 63 26668
>> Fax: +41 44 63 21199
>> -------------------------------------------------
>> _______________________________________________
>> ParaView mailing list
>> ParaView at paraview.org
>> http://www.paraview.org/mailman/listinfo/paraview
>>


-- 
-------------------------------------------------
Bryn Lloyd
Computer Vision Laboratory
ETH Zürich, Sternwartstrasse 7
CH - 8092 Zürich, Switzerland
Tel: +41 44 63 26668
Fax: +41 44 63 21199
-------------------------------------------------