vtk检查两个模型是否相交，代码如何实现

您好，可以使用VTK库中的vtkBooleanOperationPolyDataFilter进行模型的相交检测。下面是C++代码实现的例子：

#include <vtkSmartPointer.h>
#include <vtkBooleanOperationPolyDataFilter.h>
#include <vtkCleanPolyData.h>
#include <vtkSTLReader.h>

int main(int argc, char *argv[])
{
    vtkSmartPointer<vtkSTLReader> reader1 =
        vtkSmartPointer<vtkSTLReader>::New();
    reader1->SetFileName("model1.stl");

    vtkSmartPointer<vtkSTLReader> reader2 =
        vtkSmartPointer<vtkSTLReader>::New();
    reader2->SetFileName("model2.stl");

    vtkSmartPointer<vtkBooleanOperationPolyDataFilter> boolFilter =
        vtkSmartPointer<vtkBooleanOperationPolyDataFilter>::New();
    boolFilter->SetOperationToIntersection();
    boolFilter->SetInputConnection(0, reader1->GetOutputPort());
    boolFilter->SetInputConnection(1, reader2->GetOutputPort());
    boolFilter->Update();

    bool isIntersecting = false;

    vtkSmartPointer<vtkCleanPolyData> cleanFilter =
        vtkSmartPointer<vtkCleanPolyData>::New();
    cleanFilter->SetInputData(boolFilter->GetOutput());
    cleanFilter->Update();

    if (cleanFilter->GetOutput()->GetNumberOfCells() > 0)
        isIntersecting = true;

    std::cout << "Is model1 intersecting with model2? " 
              << (isIntersecting ? "Yes" : "No") << std::endl;

    return 0;
}

其中，vtkSTLReader是用于读取STL格式文件的类，vtkBooleanOperationPolyDataFilter是用于进行布尔运算的类。上述代码实现了对两个STL格式的模型进行交集运算，并判断其是否相交。 如果相交，则`isIntersecting`标志为`true`。