[vtkusers] Please help

[Bill Lorensen]

Ahmed,
You need to apply an Update to your ImageToStructuredPoints:
toStructuredPoints->SetInput(reader->GetOutput())
toStructuredPoints->Update()

In your first example, the GetImage(1) forces a read. But the second example has nothing to force the read.

Bill


At 07:31 PM 6/8/00 +0300, AHMED MAHMOUD wrote:
>Hello ,
>I have 16 bit image I used this pipeline to access the pixels values
>vtkVolume16Reader reader
>vtkStructuredPoints sp
>sp=reader->GetImage (1)
>vtkScalars scalar
>scalar = sp->GetPointData()->GetScalars()
>and it works,
>but when I used the same pipeline to read bmp data the scalar  pointer was
>Null why ?? here is my code
>///////////////////
>vtkBMPReader reader
>vtkImageToStructuredPoints  toStructuredPoints
>toStructuredPoints->SetInput(reader->GetOutput())
>vtkStructuredPoints sp
>sp=toStructuredPoints->GetOutput()
>vtkScalars scalar
>scalar = sp->GetPointData()->GetScalars();
>////////////
>Why scalar is Null ??
>Thank you very much
>
>
>
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