我正在使用 VTK 从使用地面激光扫描仪获得的输入点列表中生成 3D Delaunay 三角剖分。到目前为止，我成功生成了一些 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流行格式之一，例如 .ply、.stl、.obj 或 .wrl。您能否告诉我如何以其中一种格式保存 3d 三角测量？我的另一个问题是关于 setAlpha 和 setTolerance 参数，你能详细解释一下这些参数吗？提前致谢
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;
}
