[vtkusers] Extract Polydata points with same scalar value

[Sara Rolfe]

Hi Jochen,

I was able to use vtkThresholdPoints to do exactly what I wanted.   
Thanks for your help!

Sara

On Jun 26, 2012, at 1:52 AM, Jochen K. wrote:

> Hi Sara,
>
> you may try to separate your polydata by scalar values using a  
> vtkThresholdPoints object:
>
> untested snippet:
>          //...
>          vtkSmartPointer<vtkThresholdPoints> threshold =  
> vtkSmartPointer<vtkThresholdPoints>::New();
>          threshold.SetInput(contourPolydata);
>          threshold.SetInputArrayToProcess(
>             0,
>             0,
>             vtkDataObject::FIELD_ASSOCIATION_POINTS,
>             vtkDataSetAttributes::SCALARS,
>             "NameOfYourScalarArray");
>          threshold->ThresholdBetween(0, 1); // would give you the  
> points labeled with 1
>          // you may have to experiment with the value range a bit
>          //threshold->ThresholdBetween(1, 2); // would give you the  
> points labeled with 2
>
>          threshold->Update();
>
>          vtkSmartPointer<vtkPolyData> part =  
> vtkSmartPointer<vtkPolyData>::New();
>          part->SetInputConnection(threshold->GetOutputConnection());
>          //...
>
> best regards
> Jochen
> View this message in context: Re: Extract Polydata points with same  
> scalar value
> Sent from the VTK - Users mailing list archive at Nabble.com.
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