[vtkusers] Re: What Is Wrong With My VTK Pipeline ?

[Sylvain Jaume]

Mark,

As Amy said, vtkImageMandelbrotSource is a source: it derived from 
vtkAlgorithm, so it has a SetInputConnection method but *it cannot be 
used*. Do not connect vtkVolume16Reader to vtkImageMandelbrotSource, 
just use one or the other.

Sincerely,
Sylvain

JohnMark wrote:
> thank you , Sylvain ,
>  
>     I have send it to the maillist .
>     I just see that vtkImageMandelbrotSource has an input port method : 
> SetInputConnection() , and it
> can take vtkImageData as input ports , so I think it will be OK if 
> I compile it . however , I get many
> errors from it . maybe I have to retest it now .
>  
>     thank you for your help again , sylvain .
>    
>     Mark  
> 
> 
> 
> 
> ------------------------------------------------------------------------
> 
>  > Date: Wed, 19 Sep 2007 09:27:12 -0400
>  > From: sylvain.jaume at kitware.com
>  > To: zhaojunxp at hotmail.com; vtkusers at vtk.org
>  > Subject: Re: What Is Wrong With My VTK Pipeline ?
>  >
>  > Hi Mark,
>  >
>  > (Please keep your postings to vtkusers mailing list.)
>  >
>  > vtkImageMandelbrotSource and vtkVolume16Reader are both sources, they
>  > don't accept an input. They both produce a vtkImageData, so either use
>  > one or the other for testing your application.
>  >
>  > You can convert a vtkImageData to a vtkUnstructuredGrid using
>  > vtkThreshold. For volume rendering a vtkUnstructuredGrid, have a look at
>  > the vtkUnstructuredGridVolumeRayCastMapper. You'll find an example in
>  > VTK/Examples/VolumeRendering/Tcl/IntermixedUnstructuredGrid.tcl
>  >
>  > Sincerely,
>  > Sylvain
>  >
>  > JohnMark wrote:
>  > > Hi , Sylvain ,
>  > > thank you for your help within these days . and this is one problem
>  > > that my friend ask me , but I
>  > > still don't know why it is , even though I have read the vtk user 
> guide
>  > > and so on :
>  > > I have been testing some examples of cells during these days . and I
>  > > find an interesting class :
>  > > vtkImageMandelbrotSource , because its output can be used by volume
>  > > rendering , although the volume
>  > > rendering is unstructured grid volume rendering .
>  > > and I find it has an input method : SetInputConnection(vtkDataObject
>  > > *) , so I think it may be OK
>  > > if I take the output of class vtkVolume16Reader as its input , but ,
>  > > luckily , I get an error :
>  > > Attempt to connect input port index 0 for an algorithm with 0 input
>  > > ports . but in other examples of
>  > > volume rendering , there is not any error like this , and all of them
>  > > work well . so I don't think
>  > > there is 0 input ports .
>  > > the codes is just as follows :
>  > >
>  > > vtkVolume16Reader *reader = vtkVolume16Reader::New();//**** the v16
>  > > codes is no problem , I have test it many times .
>  > > reader->SetDataDimensions(64,64);
>  > > reader->SetImageRange(1,93);
>  > > reader->SetDataByteOrderToLittleEndian();
>  > > reader->SetFilePrefix("../headsq/quarter");
>  > > reader->SetDataSpacing(3.2, 3.2, 1.5);
>  > > vtkImageMandelbrotSource *input = vtkImageMandelbrotSource::New();
>  > > input->SetInputConnection(reader->GetOutputPort());
>  > >
>  > > so there are the problems :
>  > > 1、of course , vtkImageMandelbrotSource can create images by itself
>  > > , is it real that
>  > > vtkImageMandelbrotSource can not take other images as input ports ?
>  > > 2、if it is so , all the unstructured grid volume rendering methods
>  > > can not take random images
>  > > as their input ports ? if it is not , what should I do before I send
>  > > the images (like .dcm images) to
>  > > vtkImageMandelbrotSource ?
>  > > and I have tried vtkUnstructuredGridAlgorithm , it can transform the
>  > > images to unstructured grid ,
>  > > just as the unstructured grid volume rendering requires , but it 
> doesn't
>  > > work .
>  > > or in other words , these methods , like
>  > > vtkUnstructuredGridVolumeZSweepMapper , can not be used
>  > > by the medical visualization system , so which field can they be used ?
>  > >
>  > > thank you with great regards !
>  > >
>  > > Mark
>  > >
>  > >
>  > > 
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