[vtkusers] SetDataSpacing does not work

[samo]

Hello together

first of all, thanks for all the tips. Unfortunately, none of them worked. I
just don't understand why the spacing is totally ignored. 

Here is my code:

CString filename = fDlg.GetPathName();
		
m_MetaVolumeReader->GetOutput()->SetOrigin(0.0, 0.0, 0.0);
m_MetaVolumeReader->SetFileName(filename);
m_MetaVolumeReader->SetDataExtent(0,511,0,511,0,102);	
m_MetaVolumeReader->SetDataByteOrderToLittleEndian();
m_volumeData = m_MetaVolumeReader->GetOutput();

ImageReslice* reslice = vtkImageReslice::New();
reslice->SetInput(m_MetaVolumeReader->GetOutput());
reslice->InterpolateOn();
reslice->SetOutputSpacing(1.0, 1.0, 2.0);

.........marching cubes, polydata, renderer.....




David Gobbi wrote:
> 
> Hi Samo,
> 
> If you want to enlarge the image, you can do one of two things:
> 
> display the image with vtkImageActor, and use these camera methods:
> camera->ParallelProjectionOn();
> camera->SetParallelScale(scale);
> 
> - or - if you want to use vtkImageMapper (or vtkImageViewer),
> 
> change the spacing with vtkImageReslice:
> reslice->InterpolationOn();
> reslice->SetOutputSpacing(newpacing, newspacing, newspacing);
> 
> Using vtkImageReslice will resample the image.
> 
> 
> The vtkImageMapper and vtkImageViewer completely ignore the
> spacing, which is why you must resample the image before sending
> it to them.
> 
> 
>  - David
> 
> 
> samo wrote:
>> Well, I tried now vtkImageChangeInformation, and the
>> m_MetaVolumeReader->GetOutput()->SetSpacing........
>>
>> but both did not work. 
>>
>> I try to change the spacing as the picture on the screen is too small and
>> I
>> thought, the easieast way might just be to change the data spacing. But
>> maybe I should try to transform the volume. I have no idea, as I am
>> totally
>> new to vtk and do not know what possibilities I have.
>>
>> Thank you very much for any further help.
>>
>>
>>
>>
>>
>> John Biddiscombe wrote:
>>   
>>> But you should really use vtkImageChangeInformartion to preserve the 
>>> change after filter updates.
>>>
>>> JB
>>>
>>>     
>>>> samo wrote:
>>>>       
>>>>> Hello there
>>>>>
>>>>> I try to manipulate the data spacing from the data I get with
>>>>> vtkMetaImageReader. The problem is, that after a pipeline update, the
>>>>> spacing is set back to its original values. I don't understand why
>>>>> this
>>>>> happens. Why is vtk just ignoring the SetDataSpacing?
>>>>>
>>>>> This is my code:
>>>>>
>>>>> vtkMetaImageReader *in_Reader = vtkMetaImageReader::New();
>>>>> in_Reader->SetFileName( "MyFile.mhd" );   
>>>>> in_Reader->Update();
>>>>> in_Reader->SetDataSpacing(1.0,1.0,5.0);  //at this point, the spacing
>>>>> is
>>>>> correct
>>>>>         
>>>> Try changing that to:
>>>>
>>>> in_Reader->GetOutput()->SetSpacing(1.,1.,5.);
>>>>
>>>> HTH
>>>> Mathieu
>>>> Ps: why would you want to change the spacing when it is read from a 
>>>> file with a header ?
>>>> _______________________________________________
>>>> This is the private VTK discussion list. Please keep messages 
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>>>>       
>>> -- 
>>> John Biddiscombe,                            email:biddisco @ cscs.ch
>>> http://www.cscs.ch/about/BJohn.php
>>> CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
>>> Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82
>>>
>>>
>>> _______________________________________________
>>> This is the private VTK discussion list. 
>>> Please keep messages on-topic. Check the FAQ at:
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>>>
>>>     
>>
>>   
> 
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> 

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