Dear deal.II Community,
I am working on a project where I am trying to generate a parallel mesh
using TriangulationDescription with
parallel::fullydistributed::Triangulation. My goal is to create a
triangulation from a structured grid based on a matrix of material IDs.
I have implemented the following code to generate the mesh:
template <int dim>
void LaplaceProblem<dim>::generate_mesh_from_matrix(int Nx, int Ny, int Nz)
{
std::vector<Point<dim>> vertices;
std::vector<TriangulationDescription::CellData<dim>> cells;
std::vector<unsigned int> subdomain_ids;
unsigned int vertex_counter = 0;
std::map<std::tuple<unsigned int, unsigned int, unsigned int>, unsigned
int> vertex_map;
// Generate vertices
for (unsigned int i = 0; i <= Nx; ++i)
for (unsigned int j = 0; j <= Ny; ++j)
for (unsigned int k = 0; k <= Nz; ++k)
{
Point<dim> p(i, j, k);
vertices.push_back(p);
vertex_map[std::make_tuple(i, j, k)] = vertex_counter++;
}
// Generate cells
for (unsigned int i = 0; i < Nx; ++i)
for (unsigned int j = 0; j < Ny; ++j)
for (unsigned int k = 0; k < Nz; ++k)
{
int material_id = mat_matrix[j + k * Ny][i];
if (material_id == _mat_tau_1)
{
TriangulationDescription::CellData<dim> cell;
cell.vertices = {vertex_map[std::make_tuple(i, j, k)],
vertex_map[std::make_tuple(i + 1, j,
k)],
vertex_map[std::make_tuple(i, j + 1,
k)],
vertex_map[std::make_tuple(i + 1, j +
1, k)],
vertex_map[std::make_tuple(i, j, k +
1)],
vertex_map[std::make_tuple(i + 1, j, k
+ 1)],
vertex_map[std::make_tuple(i, j + 1, k
+ 1)],
vertex_map[std::make_tuple(i + 1, j +
1, k + 1)]};
cell.material_id = material_id;
cells.push_back(cell);
subdomain_ids.push_back(Utilities::MPI::this_mpi_process(_mpi_communicator));
}
}
TriangulationDescription::Description<dim, dim>
triangulation_description;
triangulation_description.vertices = vertices;
triangulation_description.cells = cells;
triangulation_description.subdomain_ids = subdomain_ids;
triangulation_pft.create_triangulation(triangulation_description);
pcout << "Number of active cells: " <<
triangulation_pft.n_active_cells() << std::endl;
pcout << "Number of vertices: " << triangulation_pft.n_vertices() <<
std::endl;
}
When I compile the code, I get the following errors:
/home/saxenar/local/programs/tortuosity_github/source/tortuosity_parallel_FDM_discriptor_MPI.cc:957:26:
Fehler: »struct dealii::TriangulationDescription::CellData<3>« hat kein
Element namens »vertices«
/home/saxenar/local/programs/tortuosity_github/source/tortuosity_parallel_FDM_discriptor_MPI.cc:967:26:
Fehler: »struct dealii::TriangulationDescription::CellData<3>« hat kein
Element namens »material_id«
/home/saxenar/local/programs/tortuosity_github/source/tortuosity_parallel_FDM_discriptor_MPI.cc:981:31:
Fehler: »struct dealii::TriangulationDescription::Description<3, 3>« hat
kein Element namens »vertices«
/home/saxenar/local/programs/tortuosity_github/source/tortuosity_parallel_FDM_discriptor_MPI.cc:982:31:
Fehler: »struct dealii::TriangulationDescription::Description<3, 3>« hat
kein Element namens »cells«
/home/saxenar/local/programs/tortuosity_github/source/tortuosity_parallel_FDM_discriptor_MPI.cc:983:31:
Fehler: »struct dealii::TriangulationDescription::Description<3, 3>« hat
kein Element namens »subdomain_ids«
It seems I am misunderstanding how to use
TriangulationDescription::CellData and
TriangulationDescription::Description.
Could you please guide me on the correct way to set the vertices, cells,
and subdomain IDs manually without relying on the utility functions? I want
to fully understand how to use the classes and set the data correctly for
parallel::fullydistributed::Triangulation.
Thank you for your time and support.
Best regards,
Rishabh
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