Revision cf2d0d64d5653363ecc2cd0db6448770b9466313 authored by Thomas Fischer on 27 October 2021, 07:11:17 UTC, committed by Thomas Fischer on 02 November 2021, 12:34:39 UTC
1 parent 558db7c
convertMeshToGeo.cpp
/**
* \file
* \author Karsten Rink
* \date 2013-07-05
* \brief Implementation of of mesh to geometry conversion.
*
* \copyright
* Copyright (c) 2012-2021, OpenGeoSys Community (http://www.opengeosys.org)
* Distributed under a Modified BSD License.
* See accompanying file LICENSE.txt or
* http://www.opengeosys.org/project/license
*
*/
#include "convertMeshToGeo.h"
#include "BaseLib/Logging.h"
#include "Elements/Quad.h"
#include "Elements/Tri.h"
#include "GeoLib/GEOObjects.h"
#include "GeoLib/Surface.h"
#include "GeoLib/Triangle.h"
#include "Mesh.h"
#include "MeshEditing/MeshRevision.h"
#include "MeshInformation.h"
namespace
{
/// Convert and add mesh nodes to the geo_objects. A new name of the geo object
/// is returned.
std::string convertMeshNodesToGeoPoints(MeshLib::Mesh const& mesh,
double const eps,
GeoLib::GEOObjects& geo_objects)
{
auto points = std::make_unique<std::vector<GeoLib::Point*>>();
points->reserve(mesh.getNumberOfNodes());
std::transform(begin(mesh.getNodes()), end(mesh.getNodes()),
std::back_inserter(*points),
[](MeshLib::Node const* node_ptr)
{ return new GeoLib::Point(*node_ptr, node_ptr->getID()); });
auto geoobject_name = mesh.getName(); // Possibly modified when adding
// points to the geo objects.
geo_objects.addPointVec(std::move(points), geoobject_name, nullptr, eps);
return geoobject_name;
}
void addElementToSurface(MeshLib::Element const& e,
std::vector<std::size_t> const& id_map,
GeoLib::Surface& surface)
{
if (e.getGeomType() == MeshLib::MeshElemType::TRIANGLE)
{
surface.addTriangle(id_map[getNodeIndex(e, 0)],
id_map[getNodeIndex(e, 1)],
id_map[getNodeIndex(e, 2)]);
return;
}
if (e.getGeomType() == MeshLib::MeshElemType::QUAD)
{
surface.addTriangle(id_map[getNodeIndex(e, 0)],
id_map[getNodeIndex(e, 1)],
id_map[getNodeIndex(e, 2)]);
surface.addTriangle(id_map[getNodeIndex(e, 0)],
id_map[getNodeIndex(e, 2)],
id_map[getNodeIndex(e, 3)]);
return;
}
// all other element types are ignored (i.e. lines)
};
} // namespace
namespace MeshLib
{
bool convertMeshToGeo(const MeshLib::Mesh& mesh,
GeoLib::GEOObjects& geo_objects,
double const eps)
{
if (mesh.getDimension() != 2)
{
ERR("Mesh to geometry conversion is only working for 2D meshes.");
return false;
}
// Special handling of the bounds in case there are no materialIDs present.
auto get_material_ids_and_bounds = [&]()
-> std::tuple<MeshLib::PropertyVector<int> const*, std::pair<int, int>>
{
auto const materialIds = materialIDs(mesh);
if (!materialIds)
{
return std::make_tuple(nullptr, std::make_pair(0, 0));
}
auto const bounds = MeshInformation::getValueBounds(*materialIds);
if (!bounds)
{
OGS_FATAL(
"Could not get minimum/maximum ranges values for the "
"MaterialIDs property in the mesh '{:s}'.",
mesh.getName());
}
return std::make_tuple(materialIds, *bounds);
};
auto const [materialIds, bounds] = get_material_ids_and_bounds();
// elements to surface triangles conversion
const unsigned nMatGroups(bounds.second - bounds.first + 1);
auto sfcs = std::make_unique<std::vector<GeoLib::Surface*>>();
sfcs->reserve(nMatGroups);
std::string const geoobject_name =
convertMeshNodesToGeoPoints(mesh, eps, geo_objects);
auto const& points = *geo_objects.getPointVec(geoobject_name);
for (unsigned i = 0; i < nMatGroups; ++i)
{
sfcs->push_back(new GeoLib::Surface(points));
}
const std::vector<std::size_t>& id_map(
geo_objects.getPointVecObj(geoobject_name)->getIDMap());
const std::vector<MeshLib::Element*>& elements = mesh.getElements();
const std::size_t nElems(mesh.getNumberOfElements());
for (unsigned i = 0; i < nElems; ++i)
{
auto surfaceId = !materialIds ? 0 : ((*materialIds)[i] - bounds.first);
addElementToSurface(*elements[i], id_map, *(*sfcs)[surfaceId]);
}
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), geoobject_name);
return true;
}
MeshLib::Mesh* convertSurfaceToMesh(const GeoLib::Surface& sfc,
const std::string& mesh_name,
double eps)
{
// convert to a mesh including duplicated nodes
std::vector<MeshLib::Node*> nodes;
std::vector<MeshLib::Element*> elements;
std::size_t nodeId = 0;
for (std::size_t i = 0; i < sfc.getNumberOfTriangles(); i++)
{
auto* tri = sfc[i];
auto** tri_nodes = new MeshLib::Node*[3];
for (unsigned j = 0; j < 3; j++)
{
tri_nodes[j] =
new MeshLib::Node(tri->getPoint(j)->getCoords(), nodeId++);
}
elements.push_back(new MeshLib::Tri(tri_nodes, i));
for (unsigned j = 0; j < 3; j++)
{
nodes.push_back(tri_nodes[j]);
}
}
MeshLib::Mesh mesh_with_duplicated_nodes(mesh_name, nodes, elements);
// remove duplicated nodes
MeshLib::MeshRevision rev(mesh_with_duplicated_nodes);
return rev.simplifyMesh(mesh_with_duplicated_nodes.getName(), eps);
}
} // namespace MeshLib
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