vtk 使用vtkClipPolyData 裁剪删除选中的矩形区域

	class InteractorStyle : public vtkInteractorStyleRubberBandPick //重载vtkInteractorStyleRubberBandPick

	{
	public:
		static InteractorStyle* New();
		vtkTypeMacro(InteractorStyle, vtkInteractorStyleRubberBandPick);

		InteractorStyle()
		{
			selectedMapper = vtkSmartPointer<vtkDataSetMapper>::New();
			selectedActor = vtkSmartPointer<vtkActor>::New();
			renderer = vtkSmartPointer<vtkRenderer>::New();
		}

		virtual void OnLeftButtonUp()//重写左键按下消息
		{
			// Forward events  
			vtkInteractorStyleRubberBandPick::OnLeftButtonUp();

			vtkPlanes* frustum = static_cast<vtkAreaPicker*>(this->GetInteractor()->GetPicker())->GetFrustum();//获得鼠标框选矩形

			vtkClipPolyData *clipper = vtkClipPolyData::New();//裁剪polydata
			clipper->SetInputData(this->Data);
			clipper->SetClipFunction(frustum);//!!!!很重要的一步，添加自定义隐函数
			clipper->GenerateClipScalarsOn();
			clipper->GenerateClippedOutputOn();
			clipper->SetValue(0.5);