[vtkusers] Get the pointer of Scalar data

[Jianlong Zhou]

Hi, Matthias,

I tried to add gradient->Update() in the pipeline, but it still can not work. Do you 
know other methods to get Scalar pointer?

Thank you very much.

Jianlong

> Hi,
> 
> I'm not a VTK expert, but you could try to update your pipeline before
> accessing the pointer.
> See below.
> 
> Jianlong Zhou wrote:
> > 
> > hi, all,
> > 
> > I write a vtk pipeline to computer gradient magnitude of volume data.
> > I want to get the pointer to this gradient magnitude. I wrote the
> > following pipeline.But I cannot get the pointer to this gradient
> > magnitude. The value of the pointer is always 0x0000000.Is there any
> > other method to get scalar pointer? How to get the pointer to the
> > gradient magnitude?
> > 
> > My pipeline is like this:
> > 
> > vtkImageGradientMagnitude *gradient=vtkImageGradientMagnitude::New();
> >      gradient->SetDimensionality( 3);
> >      gradient->SetInput(reader->GetOutput());
> > 
> 
> Add something like that here:
> gradient->Update();
> 
> > ////Following line is to get scalar pointer, but I can not get its
> > pointer.
> > unsigned short *Pointer = (unsigned short
> > *)gradient->GetOutput()->GetScalarPointer();
> >    ..............
> > 
> > Thank you in advance.
> > 
> > Jianlong
> 
> I hope, that helps.
> 
> Bye,
>   Matthias
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