[vtkusers] resizing a volume

[Cory Quammen]

Try vtkImageConstantPad:
http://www.vtk.org/doc/nightly/html/classvtkImageConstantPad.html. It
should do exactly what you want.

-Cory

On 9/12/07, Olowoyeye,  Adebayo Ol Uwole <aolowoye at indiana.edu> wrote:
> Hi all,
>   I want to resize a structuredPoints object.  The dimensions are
> initially 128x128x57.  I want to resize this volume to 128x128x128.
> The tricky part is this:
>   I want to zero out every point that is not part of the original
> volume.  In other words, I want the small volume inside the bigger one.
>   Is there a way to do this without having to set the points manually
> as I did below:
>
> vtkUnsignedCharArray* vectors = vtkUnsignedCharArray::New();
> //vectors->SetNumberOfComponents(3);
> //vectors->SetNumberOfTuples(dimX*dimY*dimZ);
>                 //volData->SetNumberOfComponents(permute->GetOutput()->GetNumberOfScalarComponents());
> //volData->SetNumberOfValues(dimX*dimY*dimZ);
> int kOffset, jOffset, offset;
> for(int k=0; k<dimZ; k++){
>         kOffset = k * dimY * dimX;
>         for(int j=0; j<dimY; j++){
>                 jOffset = j * dimX;
>                 for(int i=0; i<dimX; i++){
>                         offset = i + jOffset + kOffset;
>                         if((i>=origDimX) || (j>=origDimY) || (k>=origDimZ)){
>                                                 //points->InsertPoint(offset,i,j,k);
>                                 vectors->InsertTuple1(offset, 0.0);
>                         }
>                         else{
>                                 //points->InsertPoint(offset,i,j,k);
>                                 vectors->InsertTuple1(offset,
> permute->GetOutput()->GetScalarComponentAsDouble(i,j,k,0));
>
>                         }
>                }
>         }
> }
>
> newVolume->SetDimensions(dimX, dimY, dimZ);
> newVolume->SetExtent(0,dimX-1,0,dimY-1,0,dimZ-1);
> newVolume->SetScalarType(permute->GetOutput()->GetScalarType());
> newVolume->GetPointData()->SetScalars(vectors);
>                 newVolume->SetNumberOfScalarComponents(permute->GetOutput()->GetNumberOfScalarComponents());
> newVolume->GetPointData()->Update();
> newVolume->Update();
>
>
> Thanks in advance!!
>
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-- 
Cory Quammen
Department of Computer Science
University of North Carolina at Chapel Hill
http://www.cs.unc.edu/~cquammen