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

[JohnMark]

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 > > > > > > ------------------------------------------------------------------------> > 使用新一代 Hotmail，更强大、更安全、更多存储空间！ 立刻体验！ > > <http://www.hotmail.com>
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