[vtkusers] Problem connecting vtkImageData with vtImageWrapPad in VTK 5.0

[Merchan, Alejandro]

Hi Berk!

Here are some images, the tcl-scripts for vtk 4.2 and 5.0, and the file from which we build the vtkImageData. 

ftp://ftp.sulzer.com/2+itag+/imageWrapPad

Thanks for your reply.

Alejandro



-----Ursprüngliche Nachricht-----
Von: Berk Geveci [mailto:berk.geveci at kitware.com] 
Gesendet: Dienstag, 27. Mai 2008 23:02
An: Merchan, Alejandro
Cc: vtkusers at vtk.org
Betreff: Re: [vtkusers] Problem connecting vtkImageData with vtImageWrapPad in VTK 5.0

What do you mean by "different result"? Some images may help.

On Mon, May 26, 2008 at 12:37 PM, Merchan, Alejandro <Alejandro.Merchan at sulzer.com> wrote:
> Hi vtkusers
>
> I'm updating a vtk-application from version 4.2 to 5.0 and I'm having 
> some problems connecting  an instance of vtkImageData with an instance 
> of vtkImageWrapPad in VTK 5.0.  VTK 5.0 does accept my vtkImageData as 
> Input and does not complain about it, anyhow it produces a different 
> result than VTK 4.2. I could not load the whole Example because it was 
> bigger than 100 KB.
>
> After Reading a VTK-file (with Dataset Format structured points)  I 
> extract a Volume of Interest with extractPlane (an instance of 
> vtkExtractVOI) and set some scalars of it to an instance of 
> vtkImageData. (I used SetInputConnection and GetOutputPort for VTK 
> 5.0)
>
> vtkStructuredPointsReader reader
> reader SetFileName "/data/home/vm/Documents/extractedConcentration.vtk"
> reader UpdateWholeExtent
>
> vtkExtractVOI extractPlane
>   #extractPlane DebugOn
>   extractPlane SetInput [reader GetOutput]
>   extractPlane SetVOI 0 201 0 201 1 1
>   extractPlane UpdateWholeExtent
>
> vtkImageData imagePlane
> imagePlane SetDimensions 200 200 1
> [imagePlane GetPointData] SetScalars [[[extractPlane GetOutput] 
> GetCellData] GetScalars]
>
>  Till this point everything works fine and both VTK 4.2 and 5.0 
> produce the same results. The problem appears in the next step when 
> passing imagePlane as input to an instance of vtkImageWrapPad.
>
>  vtkImageWrapPad imageWrap
>   imageWrap SetInput imagePlane
>   #imageWrap SetOutputWholeExtent 0 [expr $power2x - 1] 0 [expr 
> $power2y - 1] 0 0
>   imageWrap UpdateWholeExtent
>
> Since imagePlane as an instance of vtkImageData does not have an 
> output or outputport directly I try to pass it to imageWrap using the 
> SetInput method just like it worked on our program with VTK 4.2 . VTK 
> 5.0 actually accepts this and does not complain about it, however it 
> produces a different result than VTK 4.2 does. Since I saw on the 
> examples of VTK that imageWrap should be actually used with 
> SetInputConnection and GetOuputPort I tried passing imagePlane to 
> other graphic Filters bevor passing it to vtkImageWrapPad ( For 
> example here VTK 4 syntax )
>
> vtkImageMagnify mag
>  mag SetInput ImagePlane
>  mag SetMagnificationFactors 1 1 1
>  mag UpdateWholeExtent
>
> vtkImageWrapPad imageWrap
>   imageWrap SetInput [mag GetOutput]
>   #imageWrap SetOutputWholeExtent 0 [expr $power2x - 1] 0 [expr 
> $power2y - 1] 0 0
>   imageWrap UpdateWholeExtent
>
> But it also only worked as expected on VTK 4.2.  The only solution 
> that actually kind of worked was writing imagePlane (vtkImageData) in 
> a temporary file with vtkStructuredPointsWriter and passing the Output 
> of a vtkStructuredPointsReader (which reads the file produced by
> vtkStructuredPointsWriter) to vtkImageWrapPad. It worked in such a 
> way, that  the right image is shown well in the render Window, but it 
> changes the behaviour of my programm, so that other function which are 
> based on the Output of vtkImageWrapPad are not working anymore 
> (neither on vtk 4.2 nor in 5.0).
>
> Has anybody of you had such kind of problems?. Isn't it possible 
> anymore to connect a vtkImageData with vtkImageWrapPad directly so 
> that it just works the way it did in VTK 4.2?
>
> Thanks for any help!
>
> Alejandro
>
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