[vtkusers] Re: What Is Wrong With My VTK Pipeline ?
Amy Squillacote
amy.squillacote at kitware.com
Wed Sep 19 10:41:23 EDT 2007
Hi John,
The vtkImageMandelbrotSource produces only vtkImageData output; it does
not produce vtkUnstructuredGrid. Please try the simple pipeline that
Sylvain describes below. Only use vtkUnstructuredGridVolumeMapper
classes if the dataset you are rendering is a vtkUnstructuredGrid.
- Amy
Sylvain Jaume wrote:
> Hi Mark,
>
> Please create this pipeline:
>
> vtkImageMandelbrotSource -> vtkVolumeTextureMapper3D
>
> You don't need to convert your vtkImageData to vtkUnstructuredGrid.
>
> You'll find an example of vtkVolumeTextureMapper3D here:
> VTK/VolumeRendering/Testing/Tcl/volTM3DCropRegions.tcl
>
> Sylvain
>
> JohnMark wrote:
>> thank you , Sylvain ,
>> I have read the information of vtkImageMandelbrotSource , it says
>> that vtkImageMandelbrotSource creates an _*unsigned char image*_ of
>> the _*Mandelbrot set*_ . and then I will ask if its data type is
>> vtkUnstructuredGrid and be used in vtkUnstructuredGridVolumeMapper ,
>> why can it create an unsigned
>> char image ? should I can consider it as a vtkImageData type ? and is
>> there an clash between them ? a
>> Mandelbrot set woule have the vtkUnstructuredGrid and vtkImageData
>> type at the same time ?
>>
>> thank you again !
>>
>> Mark
>>
>>
>>
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>> > Date: Wed, 19 Sep 2007 09:54:40 -0400
>> > From: sylvain.jaume at kitware.com
>> > To: zhaojunxp at hotmail.com
>> > CC: vtkusers at vtk.org
>> > Subject: Re: What Is Wrong With My VTK Pipeline ?
>> >
>> > 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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--
Amy Squillacote
Kitware, Inc.
28 Corporate Drive
Clifton Park, NY 12065
Phone: (518) 371-3971 x106
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