void ExodusII_IO::read (const std::string& fname)
{
// This is a serial-only process for now;
// the Mesh should be read on processor 0 and
// broadcast later
// libmesh_assert_equal_to (libMesh::processor_id(), 0);
#ifndef LIBMESH_HAVE_EXODUS_API
libMesh::err << "ERROR, ExodusII API is not defined.\n"
<< "Input file " << fname << " cannot be read"
<< std::endl;
libmesh_error();
#else
// Get a reference to the mesh we are reading
MeshBase& mesh = MeshInput<MeshBase>::mesh();
// Clear any existing mesh data
mesh.clear();
// Keep track of what kinds of elements this file contains
elems_of_dimension.clear();
elems_of_dimension.resize(4, false);
#ifdef DEBUG
this->verbose(true);
#endif
ExodusII_IO_Helper::ElementMaps em; // Instantiate the ElementMaps interface
exio_helper->open(fname.c_str()); // Open the exodus file, if possible
exio_helper->read_header(); // Get header information from exodus file
exio_helper->print_header(); // Print header information
//assertion fails due to inconsistent mesh dimension
// libmesh_assert_equal_to (static_cast<unsigned int>(exio_helper->get_num_dim()), mesh.mesh_dimension()); // Be sure number of dimensions
// is equal to the number of
// dimensions in the mesh supplied.
exio_helper->read_nodes(); // Read nodes from the exodus file
mesh.reserve_nodes(exio_helper->get_num_nodes()); // Reserve space for the nodes.
// Loop over the nodes, create Nodes with local processor_id 0.
for (int i=0; i<exio_helper->get_num_nodes(); i++)
mesh.add_point (Point(exio_helper->get_x(i),
exio_helper->get_y(i),
exio_helper->get_z(i)), i);
libmesh_assert_equal_to (static_cast<unsigned int>(exio_helper->get_num_nodes()), mesh.n_nodes());
exio_helper->read_block_info(); // Get information about all the blocks
mesh.reserve_elem(exio_helper->get_num_elem()); // Reserve space for the elements
// Read in the element connectivity for each block.
int nelem_last_block = 0;
std::map<int, unsigned int> exodus_id_to_mesh_id;
// Loop over all the blocks
for (int i=0; i<exio_helper->get_num_elem_blk(); i++)
{
// Read the information for block i
exio_helper->read_elem_in_block (i);
int subdomain_id = exio_helper->get_block_id(i);
// populate the map of names
mesh.subdomain_name(static_cast<subdomain_id_type>(subdomain_id)) =
exio_helper->get_block_name(i);
// Set any relevant node/edge maps for this element
const std::string type_str (exio_helper->get_elem_type());
const ExodusII_IO_Helper::Conversion conv = em.assign_conversion(type_str);
//if (_verbose)
//libMesh::out << "Reading a block of " << type_str << " elements." << std::endl;
// Loop over all the faces in this block
int jmax = nelem_last_block+exio_helper->get_num_elem_this_blk();
for (int j=nelem_last_block; j<jmax; j++)
{
Elem* elem = Elem::build (conv.get_canonical_type()).release();
libmesh_assert (elem);
elem->subdomain_id() = static_cast<subdomain_id_type>(subdomain_id) ;
//elem->set_id(j);// Don't try to second guess the Element ID setting scheme!
elems_of_dimension[elem->dim()] = true;
elem = mesh.add_elem (elem); // Catch the Elem pointer that the Mesh throws back
exodus_id_to_mesh_id[j+1] = elem->id();
// Set all the nodes for this element
for (int k=0; k<exio_helper->get_num_nodes_per_elem(); k++)
{
int gi = (j-nelem_last_block)*exio_helper->get_num_nodes_per_elem() + conv.get_node_map(k); // global index
int node_number = exio_helper->get_connect(gi); // Global node number (1-based)
elem->set_node(k) = mesh.node_ptr((node_number-1)); // Set node number
// Subtract 1 since
// exodus is internally 1-based
}
}
// running sum of # of elements per block,
// (should equal total number of elements in the end)
nelem_last_block += exio_helper->get_num_elem_this_blk();
}
libmesh_assert_equal_to (static_cast<unsigned int>(nelem_last_block), mesh.n_elem());
// Set the mesh dimension to the largest encountered for an element
for (unsigned int i=0; i!=4; ++i)
if (elems_of_dimension[i])
mesh.set_mesh_dimension(i);
// Read in sideset information -- this is useful for applying boundary conditions
{
exio_helper->read_sideset_info(); // Get basic information about ALL sidesets
int offset=0;
for (int i=0; i<exio_helper->get_num_side_sets(); i++)
{
offset += (i > 0 ? exio_helper->get_num_sides_per_set(i-1) : 0); // Compute new offset
exio_helper->read_sideset (i, offset);
mesh.boundary_info->sideset_name(exio_helper->get_side_set_id(i)) =
exio_helper->get_side_set_name(i);
}
const std::vector<int>& elem_list = exio_helper->get_elem_list();
const std::vector<int>& side_list = exio_helper->get_side_list();
const std::vector<int>& id_list = exio_helper->get_id_list();
for (unsigned int e=0; e<elem_list.size(); e++)
{
// Set any relevant node/edge maps for this element
Elem * elem = mesh.elem(exodus_id_to_mesh_id[elem_list[e]]);
const ExodusII_IO_Helper::Conversion conv =
em.assign_conversion(elem->type());
mesh.boundary_info->add_side (exodus_id_to_mesh_id[elem_list[e]],
conv.get_side_map(side_list[e]-1),
id_list[e]);
}
}
// Read nodeset info
{
exio_helper->read_nodeset_info();
for (int nodeset=0; nodeset<exio_helper->get_num_node_sets(); nodeset++)
{
int nodeset_id = exio_helper->get_nodeset_id(nodeset);
mesh.boundary_info->nodeset_name(nodeset_id) =
exio_helper->get_node_set_name(nodeset);
exio_helper->read_nodeset(nodeset);
const std::vector<int>& node_list = exio_helper->get_node_list();
for(unsigned int node=0; node<node_list.size(); node++)
mesh.boundary_info->add_node(node_list[node]-1, nodeset_id);
}
}
#if LIBMESH_DIM < 3
if (mesh.mesh_dimension() > LIBMESH_DIM)
{
libMesh::err << "Cannot open dimension " <<
mesh.mesh_dimension() <<
" mesh file when configured without " <<
mesh.mesh_dimension() << "D support." <<
std::endl;
libmesh_error();
}
#endif
#endif
}
void ExodusII_IO::read (const std::string & fname)
{
// Get a reference to the mesh we are reading
MeshBase & mesh = MeshInput<MeshBase>::mesh();
// Clear any existing mesh data
mesh.clear();
// Keep track of what kinds of elements this file contains
elems_of_dimension.clear();
elems_of_dimension.resize(4, false);
#ifdef DEBUG
this->verbose(true);
#endif
// Instantiate the ElementMaps interface
ExodusII_IO_Helper::ElementMaps em(*exio_helper);
// Open the exodus file in EX_READ mode
exio_helper->open(fname.c_str(), /*read_only=*/true);
// Get header information from exodus file
exio_helper->read_header();
// Read the QA records
exio_helper->read_qa_records();
// Print header information
exio_helper->print_header();
// Read nodes from the exodus file
exio_helper->read_nodes();
// Reserve space for the nodes.
mesh.reserve_nodes(exio_helper->num_nodes);
// Read the node number map from the Exodus file. This is
// required if we want to preserve the numbering of nodes as it
// exists in the Exodus file. If the Exodus file does not contain
// a node_num_map, the identity map is returned by this call.
exio_helper->read_node_num_map();
// Loop over the nodes, create Nodes with local processor_id 0.
for (int i=0; i<exio_helper->num_nodes; i++)
{
// Use the node_num_map to get the correct ID for Exodus
int exodus_id = exio_helper->node_num_map[i];
// Catch the node that was added to the mesh
Node * added_node = mesh.add_point (Point(exio_helper->x[i], exio_helper->y[i], exio_helper->z[i]), exodus_id-1);
// If the Mesh assigned an ID different from what is in the
// Exodus file, we should probably error.
if (added_node->id() != static_cast<unsigned>(exodus_id-1))
libmesh_error_msg("Error! Mesh assigned node ID " \
<< added_node->id() \
<< " which is different from the (zero-based) Exodus ID " \
<< exodus_id-1 \
<< "!");
}
// This assert is no longer valid if the nodes are not numbered
// sequentially starting from 1 in the Exodus file.
// libmesh_assert_equal_to (static_cast<unsigned int>(exio_helper->num_nodes), mesh.n_nodes());
// Get information about all the blocks
exio_helper->read_block_info();
// Reserve space for the elements
mesh.reserve_elem(exio_helper->num_elem);
// Read the element number map from the Exodus file. This is
// required if we want to preserve the numbering of elements as it
// exists in the Exodus file. If the Exodus file does not contain
// an elem_num_map, the identity map is returned by this call.
exio_helper->read_elem_num_map();
// Read in the element connectivity for each block.
int nelem_last_block = 0;
// Loop over all the blocks
for (int i=0; i<exio_helper->num_elem_blk; i++)
{
// Read the information for block i
exio_helper->read_elem_in_block (i);
int subdomain_id = exio_helper->get_block_id(i);
// populate the map of names
std::string subdomain_name = exio_helper->get_block_name(i);
if (!subdomain_name.empty())
mesh.subdomain_name(static_cast<subdomain_id_type>(subdomain_id)) = subdomain_name;
// Set any relevant node/edge maps for this element
const std::string type_str (exio_helper->get_elem_type());
const ExodusII_IO_Helper::Conversion conv = em.assign_conversion(type_str);
// Loop over all the faces in this block
int jmax = nelem_last_block+exio_helper->num_elem_this_blk;
for (int j=nelem_last_block; j<jmax; j++)
{
Elem * elem = Elem::build (conv.get_canonical_type()).release();
libmesh_assert (elem);
elem->subdomain_id() = static_cast<subdomain_id_type>(subdomain_id) ;
// Use the elem_num_map to obtain the ID of this element in the Exodus file
int exodus_id = exio_helper->elem_num_map[j];
// Assign this element the same ID it had in the Exodus
// file, but make it zero-based by subtracting 1. Note:
// some day we could use 1-based numbering in libmesh and
// thus match the Exodus numbering exactly, but at the
// moment libmesh is zero-based.
elem->set_id(exodus_id-1);
// Record that we have seen an element of dimension elem->dim()
elems_of_dimension[elem->dim()] = true;
// Catch the Elem pointer that the Mesh throws back
elem = mesh.add_elem (elem);
// If the Mesh assigned an ID different from what is in the
// Exodus file, we should probably error.
if (elem->id() != static_cast<unsigned>(exodus_id-1))
libmesh_error_msg("Error! Mesh assigned ID " \
<< elem->id() \
<< " which is different from the (zero-based) Exodus ID " \
<< exodus_id-1 \
<< "!");
// Set all the nodes for this element
for (int k=0; k<exio_helper->num_nodes_per_elem; k++)
{
// global index
int gi = (j-nelem_last_block)*exio_helper->num_nodes_per_elem + conv.get_node_map(k);
// The entries in 'connect' are actually (1-based)
// indices into the node_num_map, so to get the right
// node ID we:
// 1.) Subtract 1 from connect[gi]
// 2.) Pass it through node_num_map to get the corresponding Exodus ID
// 3.) Subtract 1 from that, since libmesh node numbering is "zero"-based,
// even when the Exodus node numbering doesn't start with 1.
int libmesh_node_id = exio_helper->node_num_map[exio_helper->connect[gi] - 1] - 1;
// Set the node pointer in the Elem
elem->set_node(k) = mesh.node_ptr(libmesh_node_id);
}
}
// running sum of # of elements per block,
// (should equal total number of elements in the end)
nelem_last_block += exio_helper->num_elem_this_blk;
}
// This assert isn't valid if the Exodus file's numbering doesn't
// start with 1! For example, if Exodus's elem_num_map is 21, 22,
// 23, 24, 25, 26, 27, 28, 29, 30, ... 84, then by the time you are
// done with the loop above, mesh.n_elem() will report 84 and
// nelem_last_block will be 64.
// libmesh_assert_equal_to (static_cast<unsigned>(nelem_last_block), mesh.n_elem());
// Set the mesh dimension to the largest encountered for an element
for (unsigned char i=0; i!=4; ++i)
if (elems_of_dimension[i])
mesh.set_mesh_dimension(i);
// Read in sideset information -- this is useful for applying boundary conditions
{
// Get basic information about all sidesets
exio_helper->read_sideset_info();
int offset=0;
for (int i=0; i<exio_helper->num_side_sets; i++)
{
// Compute new offset
offset += (i > 0 ? exio_helper->num_sides_per_set[i-1] : 0);
exio_helper->read_sideset (i, offset);
std::string sideset_name = exio_helper->get_side_set_name(i);
if (!sideset_name.empty())
mesh.get_boundary_info().sideset_name
(cast_int<boundary_id_type>(exio_helper->get_side_set_id(i)))
= sideset_name;
}
for (unsigned int e=0; e<exio_helper->elem_list.size(); e++)
{
// The numbers in the Exodus file sidesets should be thought
// of as (1-based) indices into the elem_num_map array. So,
// to get the right element ID we have to:
// 1.) Subtract 1 from elem_list[e] (to get a zero-based index)
// 2.) Pass it through elem_num_map (to get the corresponding Exodus ID)
// 3.) Subtract 1 from that, since libmesh is "zero"-based,
// even when the Exodus numbering doesn't start with 1.
dof_id_type libmesh_elem_id =
cast_int<dof_id_type>(exio_helper->elem_num_map[exio_helper->elem_list[e] - 1] - 1);
// Set any relevant node/edge maps for this element
Elem * elem = mesh.elem(libmesh_elem_id);
const ExodusII_IO_Helper::Conversion conv = em.assign_conversion(elem->type());
// Map the zero-based Exodus side numbering to the libmesh side numbering
int mapped_side = conv.get_side_map(exio_helper->side_list[e]-1);
// Check for errors
if (mapped_side == ExodusII_IO_Helper::Conversion::invalid_id)
libmesh_error_msg("Invalid 1-based side id: " \
<< exio_helper->side_list[e] \
<< " detected for " \
<< Utility::enum_to_string(elem->type()));
// Add this (elem,side,id) triplet to the BoundaryInfo object.
mesh.get_boundary_info().add_side (libmesh_elem_id,
cast_int<unsigned short>(mapped_side),
cast_int<boundary_id_type>(exio_helper->id_list[e]));
}
}
// Read nodeset info
{
exio_helper->read_nodeset_info();
for (int nodeset=0; nodeset<exio_helper->num_node_sets; nodeset++)
{
boundary_id_type nodeset_id =
cast_int<boundary_id_type>(exio_helper->nodeset_ids[nodeset]);
std::string nodeset_name = exio_helper->get_node_set_name(nodeset);
if (!nodeset_name.empty())
mesh.get_boundary_info().nodeset_name(nodeset_id) = nodeset_name;
exio_helper->read_nodeset(nodeset);
for (unsigned int node=0; node<exio_helper->node_list.size(); node++)
{
// As before, the entries in 'node_list' are 1-based
// indcies into the node_num_map array, so we have to map
// them. See comment above.
int libmesh_node_id = exio_helper->node_num_map[exio_helper->node_list[node] - 1] - 1;
mesh.get_boundary_info().add_node(cast_int<dof_id_type>(libmesh_node_id),
nodeset_id);
}
}
}
#if LIBMESH_DIM < 3
if (mesh.mesh_dimension() > LIBMESH_DIM)
libmesh_error_msg("Cannot open dimension " \
<< mesh.mesh_dimension() \
<< " mesh file when configured without " \
<< mesh.mesh_dimension() \
<< "D support.");
#endif
}
