[vtkusers] remove triangles from polydata

[Dean Inglis]

Hi,

 

I have a vtkPolydata 3D surface comprised of triangles

with scalar values associated with the point data.  I want

to remove all triangles having a scalar value of 0 at all

three points of the triangles.  After which, I want to measure

the volume of the surface using vtkMassProperties.  

vtkThreshold does almost exactly

what I need with the exception that it outputs a

vtkUnstructuredGrid and not a vtkPolyData.  

 

vtkThreshold* threshold = vtkThreshold::New();

threshold->SetInputConnection( poly );

threshold->AllScalarsOn();

threshold->SetPointsDataTypeToFloat();

threshold->SetAttributeModeToUsePointData();

threshold->ThresholdByUpper( 0 );

 

How can I recover a vtkPolyData? I have

seen vtkUnstructuredGridToPolyDataFilter

but this is an abstract class.

 

Dean

 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Dean Inglis, PhD

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

~~~~ Center for Appendicular ~~~~~

Magnetic Resonance Imaging Studies

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

610 - 25 Charlton Ave. E.

Hamilton, Ontario, L8N 1Y2

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Assistant Professor (Adjunct)

Department of Civil Engineering

McMaster University

Hamilton, Ontario

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Software Demos:

http://www.youtube.com/watch?v=_zYNtHC9-0s

 

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