If I understood correctly, you are trying to import a two-dimensional grid
embedded in a three dimensional space. Does your code work if you use a
Triangulation<2,3>?
The error you show indicates you are using a Triangulation<3>.
Luca
> Il giorno 7 mar 2024, alle ore 08:11, Wolfgang Bangerth
> <bange...@colostate.edu> ha scritto:
>
> On 3/5/24 23:03, Yufei Fang wrote:
>> "
>> void run3D()
>> {
>> Triangulation<3> triangulation;
>> GridIn<3> grid_in;
>> grid_in.attach_triangulation(triangulation);
>> std::ifstream input_file("../resource/3D.mphtxt");
>> grid_in.read_comsol_mphtxt(input_file);
>> std::ofstream out("grid3D.vtk");
>> GridOut grid_out;
>> grid_out.write_vtk(triangulation, out);
>> std::cout << "Grid written to grid.vtk" << std::endl;
>> }
>> int main()
>> {
>> run3D();
>> }
>> "
>> the error is:
>> "
>
> This looks reasonable. Can you send us the 3D.mphtxt file?
>
>
>> 2. the tutorial said triangular and tetrahedral cannot be imported in
>> dealii, but i can import triangular or tetrahedral element by
>> gridin_COMSOL_mphtxt, is it controdicory?
>
> deal.II used to use only quadrilaterals and hexahedra until not so long ago,
> so the statement about not supporting triangular and tetrahedral meshes was
> correct. But it is no longer; can you point out where exactly you found this
> statement?
>
> Best
> W.
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth email: bange...@colostate.edu
> www: http://www.math.colostate.edu/~bangerth/
>
>
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