[vtkusers] About vtkImageData

[Wagner Sales]

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Hi Marium,

I was solved a problem on my class by using the following method:
double MyClass::computeScalarValue( vtkImageData *image, double *coords)
{

  double tol2;
  vtkCell *cell;
  vtkPointData *pd;
  int subId;
  double pcoords[3], weights[8];


  pd = image->GetPointData();

  vtkPointData* outPD = vtkPointData::New();
  outPD->InterpolateAllocate(pd, 1, 1);

  tol2 = image->GetLength();
  tol2 = tol2 ? tol2*tol2 / 1000.0 : 0.001;

  cell = image->FindAndGetCell(coords,NULL,-1,tol2,subId,pcoords,weights);
  if (cell)
    {
        outPD->InterpolatePoint(pd,0,cell->PointIds,weights);
        return outPD->GetScalars()->GetTuple1(0);
    } else {
        return -1;
        }

  outPD->Delete();
}

This method are copied from vtkImageViewerWidget, and in my class
receives vtkImageData just because are a static method. Just take a
look on original code ( are more explained ). In above case, I need
the coordinates from the pixel to give this information.

May be that's no completely solve your problem, but can put you in the
right way.

Regards

Wagner

marium ahmed wrote:
> Dear all, I'm trying to manipulate vtkImageData to access its cell
>  and get, for example, the pixels grey level in order to use them
> in making some filter. I was told that the function
> "GetScalarPointer" returns a pointer to the cells grey levels but
> upon trial, this doesn't seem true. So which function can I use to
> get the pixels grey level and location?
>
> thanks in advance, marium
>
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