[vtkusers] Data pipeline between vtkContourFilter and vtkImageMapToColors

[Iyas Hamdan]

Sorry for the late reply,
And thanks for the info Bill!
I added both actors to the renderer and it worked just fine.

Another problem though, since i'm now working with 3D volumes, would
ContourFilter still work in this case ?
I tested it on 2D images and it works fine but when I try it a 3D imagedata
the result is a bit strange.

Actually, what I'm looking for is to show the CT volume slice by slice, and
I want to show the isolines of the corresponding dose slice  on top of each
CT one.
But what I got is the whole isosurface shown over all the slices.

So my question is, can the ContourFilter be used in my case ?
or should I extract slices from my dose volume one by one, find the
isolines in each slice then combine them all back in one volume and show
this one on top of the CT ?

Thanks in advance,

Iyas

On Tue, Feb 3, 2015 at 5:33 PM, Bill Lorensen <bill.lorensen at gmail.com>
wrote:

> Each contour line has a scalar value associated with it (the iso value
> for that line). You just need to create a lookup table for the
> polydata mapper that maps the isovalues to the colors you want. No
> need to use image blend. Just render the contour lines as polydata.
>
>
> On Tue, Feb 3, 2015 at 11:21 AM, Iyas Hamdan <iyas.hamdan at gmail.com>
> wrote:
> > Hello vtkusers,
> >
> > I'm trying to visualize the RT dose on top of a CT image. To do so, I
> first
> > find the iso-dose lines using vktContourFilter which works just fine.
> > Then I want to add colors to those iso-lines depending on their value.
> So I
> > creat a lookup table and then ( I think ) I have to map my image through
> > this lookup table using vtkImageMapToColors.
> > Afterwards, I have to use vtkImageBlend with two mappers as inputs ( one
> for
> > iso-lines and one for the CT image).
> >
> > So it goes something like this:
> >
> > vtkSmartPointer<vtkImageMapToColors> DoseColorMapper =
> > vtkSmartPointer<vtkImageMapToColors>::New();
> > DoseColorMapper->SetInputData(contourFilter->GetOutput());
> > DoseColorMapper->SetLookupTable(l_lut);
> > DoseColorMapper->SetOutputFormatToRGB();
> > /// ... the same for the CT image
> > vtkSmartPointer<vtkImageBlend> imgBlender =
> > vtkSmartPointer<vtkImageBlend>::New();
> >  imgBlender->SetOpacity(0, 0.5);
> >  imgBlender->SetOpacity(1, 0.5);
> >  imgBlender->AddInputConnection(CtColorMapper->GetOutputPort());
> >  imgBlender->AddInputConnection(DoseColorMapper->GetOutputPort());
> >
> >
> >
> > The problem is, when I trying doing passing the output of the
> ContourFilter
> > to the mapper I get this error :
> > vtkCompositeDataPipeline (037DBD78): Input for connection index 0 on
> input
> > port index 0 for algorithm vtkImageMapToColors(037DBC50) is of type
> > vtkPolyData, but a vtkImageData is required.
> >
> > So my question is, do I have to convert the output of ContourFilter from
> > polydata to imagedata ?
> > or is there another way around this by giving the mapper an input of type
> > polydata ?
> >
> > any help would be really appreciated.
> >
> > Thanks in advance
> >
> > Iyas
> >
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