vtk求两个模型相交部分，得出新的模型，代码如何实现

您可以使用VTK中的vtkBooleanOperationPolyDataFilter来计算两个模型的相交部分，并将其输出为新的模型。以下是代码示例：

#include <vtkSmartPointer.h>
#include <vtkBooleanOperationPolyDataFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkXMLPolyDataReader.h>

int main(int argc, char** argv)
{
    if(argc != 3)
    {
        std::cout<<"Usage: "<<argv[0]<<" model1 model2"<<std::endl;
        return 0;
    }

    //读取两个模型
    vtkSmartPointer<vtkXMLPolyDataReader> reader1 = vtkSmartPointer<vtkXMLPolyDataReader>::New();
    reader1->SetFileName(argv[1]);

    vtkSmartPointer<vtkXMLPolyDataReader> reader2 = vtkSmartPointer<vtkXMLPolyDataReader>::New();
    reader2->SetFileName(argv[2]);

    //计算两个模型的相交部分
    vtkSmartPointer<vtkBooleanOperationPolyDataFilter> booleanOperation = vtkSmartPointer<vtkBooleanOperationPolyDataFilter>::New();
    booleanOperation->SetOperationToIntersection();
    booleanOperation->SetInputConnection(0, reader1->GetOutputPort());
    booleanOperation->SetInputConnection(1, reader2->GetOutputPort());
    booleanOperation->Update();

    //输出新的模型
    vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
    mapper->SetInputConnection(booleanOperation->GetOutputPort());

    vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);

    vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
    renderer->AddActor(actor);

    vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
    renderWindow->AddRenderer(renderer);

    vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
    interactor->SetRenderWindow(renderWindow);
    interactor->Initialize();
    interactor->Start();

    return 0;
}

请注意，这仅仅是一个示例代码，您需要将其适配到您的具体应用中。另外，这个程序需要读取两个模型的文件名作为命令行参数。如果您没有提供正确的命令行参数，程序将不会运行。