[vtkusers] vtkSelectVisiblePoints and vtkPolyData

[alanwsx]

Hi,

I am writing some code to do the depth test for some vtkPolyData object, and
I want to use vtkSelectVisiblePoints class in a qvtkwidget. However, I
always got 0 points.


following is the minimum code:


// in the qvtkwidget class:
        visible_filter = vtkSmartPointer<vtkSelectVisiblePoints>::New();
	visible_filter->SetInputData(poly_data);
	visible_filter->SetRenderer(renderer);
	visible_filter->Update();
.
.
.

// in the overloading vtkInteractorStyleTrackballCamera class:
        this->visible_filter->Update();
        qDebug() << "There are currently: " <<
this->visible_filter->GetOutput()->GetNumberOfPoints() << " visible.";




Thanks,
Shangxuan



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