[vtkusers] Extract all cell within range by thresholding.

[David E DeMarle]

Apply the threshold filter to an unstructured grid that contains the 3D
elements (voxels and tetrahedrons for example). Polydata can only contain
2D elements (quadrilaterals and triangles for example.)

Was the polydata produces by an extract surface filter? If so, apply the
threshold to whatever you fed into that instead.

hth






David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Fri, Jun 26, 2015 at 5:15 AM, madz <madaramh at gmail.com> wrote:

> I tried the following method to extract cells from a polydata within a
> range,
>
>   vtkSmartPointer<vtkThreshold> threshold =
> vtkSmartPointer<vtkThreshold>::New();
> #if VTK_MAJOR_VERSION <= 5
>   threshold->SetInput(polydata);
> #else
>   threshold->SetInputData(polydata);
> #endif
>   threshold->ThresholdBetween(1364623,1598476);
>   threshold->SetInputArrayToProcess(0, 0, 0,
> vtkDataObject::FIELD_ASSOCIATION_CELLS, "Index1");
>   threshold->Update();
>
> However both this only gives an unstructured grid which displays the outer
> cells of the threshold with none of the inside cells.
>
> How do I get all the cells within the range, and not just the crust.
> Thank you.
>
>
>
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