vtkDelaunay3D保存三角剖分

Question

我正在使用VTK从地面激光扫描仪获得的输入点列表生成3D Delaunay三角剖分。到目前为止，我成功地生成了一些3D三角剖分，并将它们保存为.vtk或.vtu文件格式。但是，我需要将它们保存为一种流行的格式，如.ply、.stl、.obj或.wrl。您能告诉我如何将3d三角测量保存为其中一种格式吗？我的另一个问题是关于setAlpha和setTolerance的参数，你能给我详细解释一下这些参数吗？提前感谢

int main( int argc, char* argv[] )
{
    //load the point cloud
    vtkSmartPointer<vtkSimplePointsReader> reader = vtkSmartPointer<vtkSimplePointsReader>::New();
    reader->SetFileName("kucuk50k.xyz");
    reader->Update();
    vtkPolyData* polydata = reader->GetOutput();
    std::cout << "The point cloud is loaded" << std::endl;
    //end of point cloud loading
    std::cout << "----------------------------------------------" << std::endl;
    // Generate a mesh from the input points. If Alpha is non-zero, then
    // tetrahedra, triangles, edges and vertices that lie within the
    // alpha radius are output.
    std::cout << "Start delaunay 3d triangulation" << std::endl;
    vtkSmartPointer<vtkDelaunay3D> delaunay3DAlpha = vtkSmartPointer<vtkDelaunay3D>::New();
    delaunay3DAlpha->SetInputConnection(reader->GetOutputPort());
    delaunay3DAlpha->SetAlpha(0.01);
    std::cout << "3d Delaunay computed" << std::endl;
    std::cout << "----------------------------------------------" << std::endl;
    std::cout << "Start writing the triangulation" << std::endl;
    vtkSmartPointer<vtkXMLUnstructuredGridWriter> ugWriter =    vtkSmartPointer<vtkXMLUnstructuredGridWriter>::New();
    ugWriter->SetInputConnection(delaunay3DAlpha->GetOutputPort());
    ugWriter->SetFileName("delaunayy_50k.vtk");
    ugWriter->Write();
    std::cout << "VTK file created" << std::endl;
    return EXIT_SUCCESS;
}

Answer 1

您尝试从扫描的地形计算三角形曲面，对吗？有没有充分的理由使用3D Delaunay来创建四面体而不是2.5D Delaunay？你可以看看我的Fade2.5D库，里面有一个免费的学生版。然而，2.5D的限制是您不能表示垂直墙，因此不能直接支持建筑物。

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