[vtkusers] Question about vtkPolyData::GetNumberOfPoints()

[ysa0829]

I use a filter that Inherit vtkPolyDataAlgorithm,then I try to get the
output's number of points ,but It would be zero. It my example code:

/vtkCylinderSource *implantCylinderSource = vtkCylinderSource::New();

        implantCylinderSource->SetCenter(0,0,0);
	implantCylinderSource->SetRadius(2);
	implantCylinderSource->SetHeight(10);
	implantCylinderSource->SetResolution(36);
	implantCylinderSource->CappingOn();
	implantCylinderSource->Update();


vtkTriangleFilter * tri2 = vtkTriangleFilter::New();
tri2 ->SetInput(implantCylinderSource ->GetOutput());

int numberOfPoints = tri2->GetOutput()->GetNumberOfPoints();
/

I can see the result in my renderer,but the numberOfPoints is Zero. 

Is anyway to get numberofpoints ? ,or Get the Polydata's Points that I can
modify.

Thanks and regards,
Anne.


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