VTK boolean operation 使用方法

来源：互联网发布：wlan 数据分流技术编辑：程序博客网时间：2024/06/04 18:40

在使用VTK的boolean operation时，仅仅接受从polydata数据结构中通过shallow copy或者直接获取数据中的polydata作为输入，才能够正确地进行布尔运算。这个类不同于其他的类，可以直接使用filter的流处理模式来进行，即通过SetInputConnection()和GetOutputPort()来获得。

并且VTK的boolean operationa中，仅仅能够处理两个三角面片交点为2或者更小的情况。对于两个三角面片共面的情况，交点情况将会变得更加复杂。因此，在处理共面三角面片之间的布尔运算时，其运算将会出现问题。

从VTK网站中获得的实例如下：

int main(int argc, char *argv[]){  vtkSmartPointer<vtkPolyData> input1;  vtkSmartPointer<vtkPolyData> input2;  vtkSmartPointer<vtkSphereSource> sphereSource1 = vtkSmartPointer<vtkSphereSource>::New();  sphereSource1->SetCenter(.25, 0, 0);  sphereSource1->Update();  input1 = sphereSource1->GetOutput();// use the polydata as input   vtkSmartPointer<vtkSphereSource> sphereSource2 = vtkSmartPointer<vtkSphereSource>::New();  sphereSource2->Update();  input2 = sphereSource2->GetOutput();  vtkSmartPointer<vtkBooleanOperationPolyDataFilter> booleanOperation =    vtkSmartPointer<vtkBooleanOperationPolyDataFilter>::New();  if (operation == "union")    {      booleanOperation->SetOperationToUnion();    }  else if (operation == "intersection")    {      booleanOperation->SetOperationToIntersection();    }  else if (operation == "difference")    {      booleanOperation->SetOperationToDifference();    }  else    {    std::cout << "Unknown operation: " << operation << std::endl;    return EXIT_FAILURE;    }#if VTK_MAJOR_VERSION <= 5  booleanOperation->SetInputConnection( 0, input1->GetProducerPort() );  booleanOperation->SetInputConnection( 1, input2->GetProducerPort() );#else  booleanOperation->SetInputData( 0, input1 ); // set the input data  booleanOperation->SetInputData( 1, input2 );#endif  vtkSmartPointer<vtkPolyDataMapper> booleanOperationMapper =    vtkSmartPointer<vtkPolyDataMapper>::New();  booleanOperationMapper->SetInputConnection( booleanOperation->GetOutputPort() );  booleanOperationMapper->ScalarVisibilityOff();   vtkSmartPointer<vtkActor> booleanOperationActor =    vtkSmartPointer<vtkActor>::New();  booleanOperationActor->SetMapper( booleanOperationMapper );   vtkSmartPointer<vtkRenderer> renderer =    vtkSmartPointer<vtkRenderer>::New();  renderer->AddViewProp(booleanOperationActor);  renderer->SetBackground(.1, .2, .3);  vtkSmartPointer<vtkRenderWindow> renderWindow =    vtkSmartPointer<vtkRenderWindow>::New();  renderWindow->AddRenderer( renderer );   vtkSmartPointer<vtkRenderWindowInteractor> renWinInteractor =    vtkSmartPointer<vtkRenderWindowInteractor>::New();  renWinInteractor->SetRenderWindow( renderWindow );   renderWindow->Render();  renWinInteractor->Start();   return EXIT_SUCCESS;}

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