bool convertMeshToGeo(const MeshLib::Mesh &mesh, GeoLib::GEOObjects &geo_objects, double eps)
{
if (mesh.getDimension() != 2)
{
ERR ("Mesh to geometry conversion is only working for 2D meshes.");
return false;
}
// nodes to points conversion
std::string mesh_name(mesh.getName());
{
auto points = std::make_unique<std::vector<GeoLib::Point*>>();
points->reserve(mesh.getNumberOfNodes());
for (auto node_ptr : mesh.getNodes())
points->push_back(new GeoLib::Point(*node_ptr, node_ptr->getID()));
geo_objects.addPointVec(std::move(points), mesh_name, nullptr, eps);
}
const std::vector<std::size_t> id_map (geo_objects.getPointVecObj(mesh_name)->getIDMap());
// elements to surface triangles conversion
std::string const mat_name ("MaterialIDs");
auto bounds (MeshInformation::getValueBounds<int>(mesh, mat_name));
const unsigned nMatGroups(bounds.second-bounds.first+1);
auto sfcs = std::make_unique<std::vector<GeoLib::Surface*>>();
sfcs->reserve(nMatGroups);
auto const& points = *geo_objects.getPointVec(mesh_name);
for (unsigned i=0; i<nMatGroups; ++i)
sfcs->push_back(new GeoLib::Surface(points));
const std::vector<MeshLib::Element*> &elements = mesh.getElements();
const std::size_t nElems (mesh.getNumberOfElements());
MeshLib::PropertyVector<int> const*const materialIds =
mesh.getProperties().existsPropertyVector<int>("MaterialIDs")
? mesh.getProperties().getPropertyVector<int>("MaterialIDs")
: nullptr;
for (unsigned i=0; i<nElems; ++i)
{
auto surfaceId = !materialIds ? 0 : ((*materialIds)[i] - bounds.first);
MeshLib::Element* e (elements[i]);
if (e->getGeomType() == MeshElemType::TRIANGLE)
(*sfcs)[surfaceId]->addTriangle(id_map[e->getNodeIndex(0)], id_map[e->getNodeIndex(1)], id_map[e->getNodeIndex(2)]);
if (e->getGeomType() == MeshElemType::QUAD)
{
(*sfcs)[surfaceId]->addTriangle(id_map[e->getNodeIndex(0)], id_map[e->getNodeIndex(1)], id_map[e->getNodeIndex(2)]);
(*sfcs)[surfaceId]->addTriangle(id_map[e->getNodeIndex(0)], id_map[e->getNodeIndex(2)], id_map[e->getNodeIndex(3)]);
}
// all other element types are ignored (i.e. lines)
}
std::for_each(sfcs->begin(), sfcs->end(), [](GeoLib::Surface* sfc){ if (sfc->getNumberOfTriangles()==0) delete sfc; sfc = nullptr;});
auto sfcs_end = std::remove(sfcs->begin(), sfcs->end(), nullptr);
sfcs->erase(sfcs_end, sfcs->end());
geo_objects.addSurfaceVec(std::move(sfcs), mesh_name);
return true;
}
void MeshLayerMapper::addLayerToMesh(const MeshLib::Mesh &dem_mesh, unsigned layer_id, GeoLib::Raster const& raster)
{
const unsigned pyramid_base[3][4] =
{
{1, 3, 4, 2}, // Point 4 missing
{2, 4, 3, 0}, // Point 5 missing
{0, 3, 4, 1}, // Point 6 missing
};
std::size_t const nNodes = dem_mesh.getNumberOfNodes();
std::vector<MeshLib::Node*> const& nodes = dem_mesh.getNodes();
int const last_layer_node_offset = layer_id * nNodes;
// add nodes for new layer
for (std::size_t i=0; i<nNodes; ++i)
_nodes.push_back(getNewLayerNode(*nodes[i], *_nodes[last_layer_node_offset + i], raster, _nodes.size()));
std::vector<MeshLib::Element*> const& elems = dem_mesh.getElements();
std::size_t const nElems (dem_mesh.getNumberOfElements());
for (std::size_t i=0; i<nElems; ++i)
{
MeshLib::Element* elem (elems[i]);
if (elem->getGeomType() != MeshLib::MeshElemType::TRIANGLE)
continue;
unsigned node_counter(3), missing_idx(0);
std::array<MeshLib::Node*, 6> new_elem_nodes;
for (unsigned j=0; j<3; ++j)
{
new_elem_nodes[j] = _nodes[_nodes[last_layer_node_offset + elem->getNodeIndex(j)]->getID()];
new_elem_nodes[node_counter] = (_nodes[last_layer_node_offset + elem->getNodeIndex(j) + nNodes]);
if (new_elem_nodes[j]->getID() != new_elem_nodes[node_counter]->getID())
node_counter++;
else
missing_idx = j;
}
switch (node_counter)
{
case 6:
_elements.push_back(new MeshLib::Prism(new_elem_nodes));
_materials.push_back(layer_id);
break;
case 5:
std::array<MeshLib::Node*, 5> pyramid_nodes;
pyramid_nodes[0] = new_elem_nodes[pyramid_base[missing_idx][0]];
pyramid_nodes[1] = new_elem_nodes[pyramid_base[missing_idx][1]];
pyramid_nodes[2] = new_elem_nodes[pyramid_base[missing_idx][2]];
pyramid_nodes[3] = new_elem_nodes[pyramid_base[missing_idx][3]];
pyramid_nodes[4] = new_elem_nodes[missing_idx];
_elements.push_back(new MeshLib::Pyramid(pyramid_nodes));
_materials.push_back(layer_id);
break;
case 4:
std::array<MeshLib::Node*, 4> tet_nodes;
std::copy(new_elem_nodes.begin(), new_elem_nodes.begin() + node_counter, tet_nodes.begin());
_elements.push_back(new MeshLib::Tet(tet_nodes));
_materials.push_back(layer_id);
break;
default:
continue;
}
}
}