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IfcOpenShell/src/serializers/HdfSerializer.cpp
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Thomas Krijnen 0b7bdc0f9d #1785 geometry caching caching
2021-11-06 13:16:13 +01:00

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/********************************************************************************
* *
* This file is part of IfcOpenShell. *
* *
* IfcOpenShell is free software: you can redistribute it and/or modify *
* it under the terms of the Lesser GNU General Public License as published by *
* the Free Software Foundation, either version 3.0 of the License, or *
* (at your option) any later version. *
* *
* IfcOpenShell is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* Lesser GNU General Public License for more details. *
* *
* You should have received a copy of the Lesser GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
* *
********************************************************************************/
#ifdef WITH_HDF5
#include "HdfSerializer.h"
#include "../ifcgeom_schema_agnostic/IfcGeomRenderStyles.h"
#include "../ifcparse/utils.h"
#include <BRepTools_ShapeSet.hxx>
#include <BinTools_ShapeSet.hxx>
#include <boost/lexical_cast.hpp>
#include <iomanip>
#include <numeric>
#include <functional>
#ifdef USE_BINARY
#define write_shape write_binary
#define read_shape read_binary
#else
#define write_shape write_text
#define read_shape read_text
#endif
herr_t print_stack(hid_t /*estack*/, void*) {
// For debugging: when using IfcConvert on Windows with wcout,
// it's difficult to get console output of HDF5 stack traces.
/*
auto f = fopen("temp.txt", "w");
H5Eprint(estack, f);
fclose(f);
*/
return 0;
}
HdfSerializer::HdfSerializer(const std::string& hdf_filename, const SerializerSettings& settings)
: GeometrySerializer(settings)
, hdf_filename(hdf_filename)
, settings_(settings)
{
H5E_auto2_t fn = &print_stack;
H5::Exception::setAutoPrint(fn, nullptr);
try {
file = H5::H5File(hdf_filename, H5F_ACC_RDWR | H5F_ACC_CREAT);
} catch (H5::Exception&) {
file = H5::H5File(hdf_filename, H5F_ACC_TRUNC);
}
str_type = H5::StrType(H5::PredType::C_S1, H5T_VARIABLE);
#ifdef USE_BINARY
auto uint_type = H5::PredType::NATIVE_UINT8;
shape_type = H5::VarLenType(&uint_type);
#else
shape_type = str_type;
#endif
hsize_t dims_3[1]{ 3 };
double3 = H5::ArrayType(H5::PredType::NATIVE_DOUBLE, 1, dims_3);
style_compound = H5::CompType(sizeof(surface_style_serialization));
style_compound.insertMember("name", HOFFSET(surface_style_serialization, name), str_type);
style_compound.insertMember("original_name", HOFFSET(surface_style_serialization, original_name), str_type);
style_compound.insertMember("id", HOFFSET(surface_style_serialization, id), H5::PredType::NATIVE_INT);
style_compound.insertMember("diffuse", HOFFSET(surface_style_serialization, diffuse), double3);
style_compound.insertMember("specular", HOFFSET(surface_style_serialization, specular), double3);
style_compound.insertMember("transparency", HOFFSET(surface_style_serialization, transparency), H5::PredType::NATIVE_DOUBLE);
style_compound.insertMember("specularity", HOFFSET(surface_style_serialization, specularity), H5::PredType::NATIVE_DOUBLE);
hsize_t dims_4x4[2]{ 4, 4 };
double4x4 = H5::ArrayType(H5::PredType::NATIVE_DOUBLE, 2, dims_4x4);
compound = H5::CompType(sizeof(brep_element));
compound.insertMember("id", HOFFSET(brep_element, id), H5::PredType::NATIVE_INT);
compound.insertMember("matrix", HOFFSET(brep_element, matrix), double4x4);
compound.insertMember("shape_serialization", HOFFSET(brep_element, shape_serialization), shape_type);
compound.insertMember("surface_style_id", HOFFSET(brep_element, surface_style), style_compound);
}
bool HdfSerializer::ready() {
return true;
}
void HdfSerializer::writeHeader() {
}
namespace {
template <typename T>
H5::DataType h5_datatype_for_cpp();
template <>
H5::DataType h5_datatype_for_cpp<int>() {
return H5::PredType::NATIVE_INT;
}
template <>
H5::DataType h5_datatype_for_cpp<double>() {
return H5::PredType::NATIVE_DOUBLE;
}
template <>
H5::DataType h5_datatype_for_cpp<std::string>() {
return H5::StrType(H5::PredType::C_S1, H5T_VARIABLE);
}
template <typename T>
void do_read(H5::Attribute& attr, T& val) {
attr.read(h5_datatype_for_cpp<T>(), &val);
}
template <>
void do_read(H5::Attribute& attr, std::string& val) {
attr.read(h5_datatype_for_cpp<std::string>(), val);
}
template <typename T>
T read_scalar_attribute(H5::H5Object& l, const std::string& name) {
auto attr = l.openAttribute(name);
auto space = attr.getSpace();
int rank = space.getSimpleExtentNdims();
// A scalar dataspace, H5S_SCALAR, has a single element, though that
// element may be of a complex datatype, such as a compound or array
// datatype. By convention, the rank of a scalar dataspace is always
// 0 (zero);
if (rank != 0) {
throw std::runtime_error("Invalid");
}
T val;
do_read<T>(attr, val);
return val;
}
}
#include <BinTools.hxx>
namespace {
// https://github.com/FreeCAD/FreeCAD/blob/master/src/Mod/Part/App/TopoShape.cpp
TopoDS_Shape read_binary(const hvl_t& vlen) {
std::string s((char*)vlen.p, (size_t)vlen.len);
std::istringstream str(s);
BinTools_ShapeSet theShapeSet;
theShapeSet.Read(str);
Standard_Integer shapeId = 0, locId = 0, orient = 0;
BinTools::GetInteger(str, shapeId);
if (shapeId <= 0 || shapeId > theShapeSet.NbShapes()) {
throw std::runtime_error("");
}
BinTools::GetInteger(str, locId);
BinTools::GetInteger(str, orient);
TopAbs_Orientation anOrient = static_cast<TopAbs_Orientation>(orient);
TopoDS_Shape shp = theShapeSet.Shape(shapeId);
shp.Location(theShapeSet.Locations().Location(locId));
shp.Orientation(anOrient);
return shp;
}
// https://github.com/FreeCAD/FreeCAD/blob/master/src/Mod/Part/App/TopoShape.cpp
void write_binary(TopoDS_Shape shp, std::string& s) {
std::ostringstream out;
BinTools_ShapeSet theShapeSet;
Standard_Integer shapeId = theShapeSet.Add(shp);
Standard_Integer locId = theShapeSet.Locations().Index(shp.Location());
Standard_Integer orient = static_cast<int>(shp.Orientation());
theShapeSet.Write(out);
BinTools::PutInteger(out, shapeId);
BinTools::PutInteger(out, locId);
BinTools::PutInteger(out, orient);
s = out.str();
}
TopoDS_Shape read_text(const std::string& s) {
std::stringstream stream(s);
BRep_Builder B;
TopoDS_Shape shp;
BRepTools::Read(shp, stream, B);
return shp;
}
void write_text(TopoDS_Shape shp, std::string& out) {
std::stringstream sstream;
BRepTools::Write(shp, sstream);
out = sstream.str();
}
}
namespace {
template <typename T>
std::vector<T> read_dataset(const H5::Group& group, const std::string& name) {
auto ds = group.openDataSet(name);
auto space = ds.getSpace();
int rank = space.getSimpleExtentNdims();
std::vector<hsize_t> dims(rank);
space.getSimpleExtentDims(dims.data(), NULL);
const hsize_t total = std::accumulate(dims.begin(), dims.end(), 1U, std::multiplies<hsize_t>());
std::vector<T> result(total);
ds.read(result.data(), h5_datatype_for_cpp<T>());
return result;
}
}
void HdfSerializer::read_surface_style(surface_style_serialization& s, std::shared_ptr<IfcGeom::SurfaceStyle>& style_ptr) {
if (strlen(s.name) || s.id) {
if (strlen(s.name) && s.id) {
style_ptr = std::make_shared<IfcGeom::SurfaceStyle>(s.id, s.name);
} else if (strlen(s.name)) {
style_ptr = std::make_shared<IfcGeom::SurfaceStyle>(s.name);
} else if (s.id) {
style_ptr = std::make_shared<IfcGeom::SurfaceStyle>(s.id);
}
auto& gss = *style_ptr;
if (s.diffuse[0] == s.diffuse[0]) {
gss.Diffuse().emplace(s.diffuse[0], s.diffuse[1], s.diffuse[2]);
}
if (s.specular[0] == s.specular[0]) {
gss.Specular().emplace(s.specular[0], s.specular[1], s.specular[2]);
}
if (s.transparency == s.transparency) {
gss.Transparency() = s.transparency;
}
if (s.specularity == s.specularity) {
gss.Specularity() = s.specularity;
}
}
}
void HdfSerializer::remove(const std::string& guid) {
if (H5Lexists(file.getId(), guid.c_str(), H5P_DEFAULT)) {
file.unlink(guid);
}
}
IfcGeom::Element* HdfSerializer::read(IfcParse::IfcFile& f, const std::string& guid, const std::string& representation_id_str, read_type rt) {
if (!H5Lexists(file.getId(), guid.c_str(), H5P_DEFAULT)) {
return nullptr;
}
auto element_group = file.openGroup(guid);
if (!H5Lexists(element_group.getId(), representation_id_str.c_str(), H5P_DEFAULT)) {
return nullptr;
}
int id = read_scalar_attribute<int>(element_group, "id");
int parent_id = read_scalar_attribute<int>(element_group, "parent_id");
std::string type = read_scalar_attribute<std::string>(element_group, "type");
std::string name = read_scalar_attribute<std::string>(element_group, "name");
std::string context = read_scalar_attribute<std::string>(element_group, "context");
std::string unique_id = read_scalar_attribute<std::string>(element_group, "unique_id");
gp_Trsf trsf;
auto placeds = element_group.openDataSet(DATASET_NAME_PLACEMENT);
double m44[4][4];
placeds.read(m44, H5::PredType::NATIVE_DOUBLE);
trsf.SetValues(
m44[0][0], m44[0][1], m44[0][2], m44[0][3],
m44[1][0], m44[1][1], m44[1][2], m44[1][3],
m44[2][0], m44[2][1], m44[2][2], m44[2][3]
);
auto representation_group = element_group.openGroup(representation_id_str);
std::string geom_id = read_scalar_attribute<std::string>(representation_group, "geom_id");
IfcGeom::ElementSettings element_settings(settings_, f.getUnit("LENGTHUNIT").second, type);
auto inst = f.instance_by_id(id)->as<IfcUtil::IfcBaseEntity>();
boost::shared_ptr<IfcGeom::Representation::BRep> brep_geometry;
boost::shared_ptr<IfcGeom::Representation::Triangulation> triangulation_geometry;
if (rt == READ_BREP) {
auto it = brep_cache_.find(representation_id_str);
if (it != brep_cache_.end()) {
brep_geometry = it->second;
}
} else {
auto it = triangulation_cache_.find(representation_id_str);
if (it != triangulation_cache_.end()) {
triangulation_geometry = it->second;
}
}
if (rt == READ_BREP && !brep_geometry) {
auto brepDataset = representation_group.openDataSet(DATASET_NAME_OCCT);
std::vector<brep_element> parts;
{
auto space = brepDataset.getSpace();
int rank = space.getSimpleExtentNdims();
if (rank != 1) {
return nullptr;
}
std::vector<hsize_t> dims(rank);
space.getSimpleExtentDims(dims.data(), NULL);
parts.resize(dims[0]);
brepDataset.read(parts.data(), compound);
}
IfcGeom::IfcRepresentationShapeItems shapes;
for (auto& part : parts) {
TopoDS_Shape shp = read_shape(part.shape_serialization);
// The gp_GTrsf(Mat, V) constructor isn't very smart in that
// it sets the Form to gp_Other. This, in turn, then means that
// in IfcOpenShell when the BRepElement is cast to a TopoDS_Compound
// (happens e.g in SVG and Python), and the trsf is multiplied into
// the shape, it is automatically converted to a Nurbs object.
// For this reason we do a quick identity check so that we in that
// case can keep the Form at gp_Identity. Better yet would be to
// do a full decomposition of the matrix in Translation Rotation and
// Scale components and use the OCCT APIs to reconstruct the Trsf
// from that.
gp_Mat M(
part.matrix[0][0], part.matrix[0][1], part.matrix[0][2],
part.matrix[1][0], part.matrix[1][1], part.matrix[1][2],
part.matrix[2][0], part.matrix[2][1], part.matrix[2][2]
);
bool is_identity = true;
// quick identity test
for (int i = 1; i < 4; ++i) {
for (int j = 1; j < 4; ++j) {
if (std::fabs(M.Row(i).Coord(j) - ((i == j) ? 1.0 : 0.0)) > 1.e-9) {
is_identity = false;
}
}
}
gp_XYZ V(
part.matrix[3][0], part.matrix[3][1], part.matrix[3][2]
);
if (gp_Pnt(V).Distance(gp::Origin()) > 1.e-9) {
is_identity = false;
}
gp_GTrsf trsf;
if (!is_identity) {
trsf = gp_GTrsf(M, V);
trsf.SetForm();
}
std::shared_ptr<IfcGeom::SurfaceStyle> style_ptr;
read_surface_style(part.surface_style, style_ptr);
shapes.push_back(IfcGeom::IfcRepresentationShapeItem(part.id, trsf, shp, style_ptr));
}
brep_geometry = boost::shared_ptr<IfcGeom::Representation::BRep>(new IfcGeom::Representation::BRep(element_settings, geom_id, shapes));
brep_cache_.insert({ representation_id_str, brep_geometry });
}
if (rt == READ_TRIANGULATION && !triangulation_geometry) {
H5::Group meshGroup;
try {
meshGroup = representation_group.openGroup(GROUP_NAME_MESH);
} catch (H5::Exception&) {
return nullptr;
}
auto verts = read_dataset<double>(meshGroup, DATASET_NAME_POSITIONS);
auto faces = read_dataset<int>(meshGroup, DATASET_NAME_INDICES);
auto edges = read_dataset<int>(meshGroup, DATASET_NAME_EDGES);
auto normals = read_dataset<double>(meshGroup, DATASET_NAME_NORMALS);
auto uvcoords = read_dataset<double>(meshGroup, DATASET_NAME_UVCOORDS);
auto material_ids = read_dataset<int>(meshGroup, DATASET_NAME_MATERIAL_IDS);
std::vector<surface_style_serialization> surface_styles;
{
auto ds = meshGroup.openDataSet(DATASET_NAME_MATERIALS);
auto space = ds.getSpace();
int rank = space.getSimpleExtentNdims();
if (rank != 1) {
return nullptr;
}
std::vector<hsize_t> dims(rank);
space.getSimpleExtentDims(dims.data(), NULL);
surface_styles.resize(dims[0]);
ds.read(surface_styles.data(), style_compound);
}
std::vector<std::shared_ptr<IfcGeom::SurfaceStyle>> surface_style_ptrs(surface_styles.size());
for (size_t i = 0; i < surface_styles.size(); ++i) {
read_surface_style(surface_styles[i], surface_style_ptrs[i]);
}
triangulation_geometry = boost::shared_ptr<IfcGeom::Representation::Triangulation>(new IfcGeom::Representation::Triangulation(
element_settings,
geom_id,
verts,
faces,
edges,
normals,
uvcoords,
material_ids,
surface_style_ptrs
));
triangulation_cache_.insert({ representation_id_str, triangulation_geometry });
}
if (rt == READ_BREP) {
return new IfcGeom::BRepElement(id, parent_id, name, type, guid, context, trsf, brep_geometry, inst);
} else {
return new IfcGeom::TriangulationElement(
IfcGeom::Element(
element_settings,
id,
parent_id,
name,
type,
guid,
context,
trsf,
inst
),
triangulation_geometry
);
}
}
namespace {
std::array<std::array<double, 4>, 4> gtrsf_to_matrix(const gp_GTrsf& trsf) {
std::array<std::array<double, 4>, 4> arr;
for (int i = 1; i < 5; ++i) {
for (int j = 1; j < 4; ++j) {
arr[i-1][j-1] = trsf.Value(j, i);
}
arr[i - 1][3] = i == 4 ? 1.0 : 0.0;
}
return arr;
}
}
H5::Group HdfSerializer::write(const IfcGeom::Element* o) {
try {
return file.openGroup(o->guid());
} catch (H5::Exception&) {}
H5::Group element_group = file.createGroup(o->guid());
typedef std::string const & (IfcGeom::Element::*string_member_fun)(void) const;
typedef int (IfcGeom::Element::*int_member_fun)(void) const;
static const std::vector<std::pair<const char* const, string_member_fun>> data_pairs_string = {
{"type", &IfcGeom::Element::type},
{"name", &IfcGeom::Element::name },
{"guid", &IfcGeom::Element::guid },
{"context", &IfcGeom::Element::context },
{"unique_id", &IfcGeom::Element::unique_id }
};
static const std::vector<std::pair<const char* const, int_member_fun>> data_pairs_int = {
{"id", &IfcGeom::Element::id},
{"parent_id", &IfcGeom::Element::parent_id },
};
H5::DataSpace attrdspace(H5S_SCALAR);
for (auto& p : data_pairs_string) {
H5::Attribute att = element_group.createAttribute(p.first, str_type, attrdspace);
att.write(str_type, ((*o).*(p.second))());
}
for (auto& p : data_pairs_int) {
H5::Attribute att = element_group.createAttribute(p.first, H5::PredType::NATIVE_INT, attrdspace);
int value = ((*o).*(p.second))();
att.write(H5::PredType::NATIVE_INT, &value);
}
hsize_t dims_4x4[2]{ 4, 4 };
H5::DataSpace dataspace_4x4(2, dims_4x4);
auto placement_dataset = element_group.createDataSet(DATASET_NAME_PLACEMENT, H5::PredType::NATIVE_DOUBLE, dataspace_4x4);
const std::vector<double>& m43 = o->transformation().matrix().data();
double m44[4][4] = {
{ m43[0], m43[3], m43[6], m43[9] },
{ m43[1], m43[4], m43[7], m43[10] },
{ m43[2], m43[5], m43[8], m43[11] },
{ 0, 0, 0, 1 }
};
placement_dataset.write(m44, H5::PredType::NATIVE_DOUBLE);
return element_group;
}
H5::Group HdfSerializer::createRepresentationGroup(const H5::Group& element_group, const std::string& gid) {
// the part before the hyphen is the representation id
auto gid2 = gid;
auto hyphen = gid2.find("-");
if (hyphen != std::string::npos) {
gid2 = gid2.substr(0, hyphen);
}
H5::Group representation_group;
try {
representation_group = element_group.openGroup(gid2);
} catch (H5::Exception&) {
representation_group = element_group.createGroup(gid2);
H5::DataSpace attrdspace(H5S_SCALAR);
{
H5::Attribute att = representation_group.createAttribute("geom_id", str_type, attrdspace);
std::string value = gid;
att.write(str_type, value);
}
}
return representation_group;
}
void HdfSerializer::write_style(surface_style_serialization& data, const IfcGeom::SurfaceStyle& s) {
data.name = s.Name().c_str();
data.original_name = s.original_name().c_str();
data.id = s.Id().get_value_or(0);
if (s.Diffuse()) {
data.diffuse[0] = s.Diffuse()->R();
data.diffuse[1] = s.Diffuse()->G();
data.diffuse[2] = s.Diffuse()->B();
}
if (s.Specular()) {
data.specular[0] = s.Specular()->R();
data.specular[1] = s.Specular()->G();
data.specular[2] = s.Specular()->B();
}
if (s.Transparency()) {
data.transparency = *s.Transparency();
}
if (s.Specularity()) {
data.specularity = *s.Specularity();
}
}
void HdfSerializer::write(const IfcGeom::BRepElement* o) {
static auto nan = std::numeric_limits<double>::quiet_NaN();
auto element_group = write((const IfcGeom::Element*)o);
auto it = group_cache_.find(o->geometry().id());
if (it != group_cache_.end()) {
H5Lcreate_soft(it->second.c_str(), element_group.getLocId(), o->geometry().id().c_str(), H5P_DEFAULT, H5P_DEFAULT);
return;
}
H5::Group representation_group = createRepresentationGroup(element_group, o->geometry().id());
const size_t len = H5Iget_name(representation_group.getId(), NULL, 0);
char* name_buffer = new char[len];
H5Iget_name(representation_group.getId(), name_buffer, len + 1);
group_cache_.insert(it, { o->geometry().id(), name_buffer });
delete[] name_buffer;
std::list<std::string> brep_strings;
size_t num_parts = std::distance(o->geometry().begin(), o->geometry().end());
brep_element* parts = new brep_element[num_parts];
size_t i = 0;
for (auto it = o->geometry().begin(); it != o->geometry().end(); ++it, ++i) {
parts[i].id = it->ItemId();
std::array<std::array<double, 4>, 4> arr = gtrsf_to_matrix(it->Placement());
for (int j = 0; j < 4; ++j) {
std::copy(arr[j].begin(), arr[j].end(), parts[i].matrix[j]);
}
brep_strings.emplace_back();
write_shape(it->Shape(), brep_strings.back());
parts[i].surface_style = { "", "", 0, {nan,nan,nan}, {nan,nan,nan}, nan, nan };
if (it->hasStyle()) {
auto& s = it->Style();
write_style(parts[i].surface_style, s);
}
#ifdef USE_BINARY
const auto& s = brep_strings.back();
parts[i].shape_serialization.p = new char[s.size()];
memcpy(parts[i].shape_serialization.p, s.c_str(), s.size());
parts[i].shape_serialization.len = s.size();
#else
parts[i].shape_serialization = brep_strings.back().c_str();
#endif
}
hsize_t dimsp[1]{ num_parts };
H5::DataSpace dataspace_parts(1, dimsp);
auto brepDataset = representation_group.createDataSet(DATASET_NAME_OCCT, compound, dataspace_parts);
brepDataset.write(parts, compound);
}
namespace {
template <typename T>
void write_dataset(const H5::Group& group, const std::string& name, const std::vector<T>& ts, size_t stride) {
hsize_t d[2]{ ts.size() / stride, stride };
H5::DataSpace dataspace(stride == 1 ? 1 : 2, d);
auto dt = h5_datatype_for_cpp<T>();
auto ds = group.createDataSet(name, dt, dataspace);
ds.write(ts.data(), dt);
}
}
void HdfSerializer::write(const IfcGeom::TriangulationElement* o) {
auto element_group = write((const IfcGeom::Element*)o);
const auto& mesh = o->geometry();
H5::Group representation_group = createRepresentationGroup(element_group, o->geometry().id());
H5::Group meshGroup = representation_group.createGroup(GROUP_NAME_MESH);
write_dataset(meshGroup, DATASET_NAME_POSITIONS, mesh.verts(), 3);
write_dataset(meshGroup, DATASET_NAME_INDICES, mesh.faces(), 3);
write_dataset(meshGroup, DATASET_NAME_EDGES, mesh.edges(), 2);
write_dataset(meshGroup, DATASET_NAME_NORMALS, mesh.normals(), 2);
write_dataset(meshGroup, DATASET_NAME_UVCOORDS, mesh.uvs(), 2);
write_dataset(meshGroup, DATASET_NAME_MATERIAL_IDS, mesh.material_ids(), 1);
{
auto& ts = mesh.materials();
hsize_t d[2] { ts.size() };
H5::DataSpace dataspace(1, d);
const auto& dt = style_compound;
std::vector<surface_style_serialization> data;
data.reserve(ts.size());
for (auto& m : ts) {
data.emplace_back();
write_style(data.back(), m.get_style());
}
auto ds = meshGroup.createDataSet(DATASET_NAME_MATERIALS, dt, dataspace);
ds.write(data.data(), dt);
}
}
const H5std_string HdfSerializer::DATASET_NAME_POSITIONS = "positions";
const H5std_string HdfSerializer::DATASET_NAME_UVCOORDS = "uvcoords";
const H5std_string HdfSerializer::DATASET_NAME_NORMALS = "normals";
const H5std_string HdfSerializer::DATASET_NAME_INDICES = "indices";
const H5std_string HdfSerializer::DATASET_NAME_EDGES = "edges";
const H5std_string HdfSerializer::DATASET_NAME_MATERIAL_IDS = "material_ids";
const H5std_string HdfSerializer::DATASET_NAME_MATERIALS = "materials";
const H5std_string HdfSerializer::DATASET_NAME_OCCT = "brep";
const H5std_string HdfSerializer::DATASET_NAME_PLACEMENT = "placement";
const H5std_string HdfSerializer::GROUP_NAME_MESH = "mesh";
#endif
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