int main(int argc, char** argv) {
IfcHierarchyHelper file;
IfcSchema::IfcBuildingElementProxy* product = new IfcSchema::IfcBuildingElementProxy(
guid(), 0, S("Blender's Suzanne"), null, null, 0, 0, null, null);
file.addBuildingProduct(product);
product->setOwnerHistory(file.getSingle<IfcSchema::IfcOwnerHistory>());
product->setObjectPlacement(file.addLocalPlacement());
IfcSchema::IfcRepresentation::list::ptr reps (new IfcSchema::IfcRepresentation::list);
IfcSchema::IfcRepresentationItem::list::ptr items (new IfcSchema::IfcRepresentationItem::list);
std::vector< std::vector< double > > vertices_vector = create_vector_from_array(vertices, sizeof(vertices) / sizeof(vertices[0]));
std::vector< std::vector< int > > indices_vector = create_vector_from_array(indices, sizeof(indices) / sizeof(indices[0]));
IfcSchema::IfcCartesianPointList3D* coordinates = new IfcSchema::IfcCartesianPointList3D(vertices_vector);
IfcSchema::IfcTriangulatedFaceSet* faceset = new IfcSchema::IfcTriangulatedFaceSet(coordinates, null, null, indices_vector, null);
items->push(faceset);
IfcSchema::IfcShapeRepresentation* rep = new IfcSchema::IfcShapeRepresentation(
file.getRepresentationContext("Model"), S("Body"), S("SurfaceModel"), items);
reps->push(rep);
IfcSchema::IfcProductDefinitionShape* shape = new IfcSchema::IfcProductDefinitionShape(0, 0, reps);
file.addEntity(shape);
product->setRepresentation(shape);
const std::string filename = "tesselated_faceset.ifc";
file.header().file_name().name(filename);
std::ofstream f(filename.c_str());
f << file;
}
int main() {
// The IfcHierarchyHelper is a subclass of the regular IfcFile that provides several
// convenience functions for working with geometry in IFC files.
IfcHierarchyHelper file;
file.header().file_name().name("IfcAdvancedHouse.ifc");
IfcSchema::IfcBuilding* building = file.addBuilding();
// By adding a building, a hierarchy has been automatically created that consists of the following
// structure: IfcProject > IfcSite > IfcBuilding
// Lateron changing the name of the IfcProject can be done by obtaining a reference to the
// project, which has been created automatically.
file.getSingle<IfcSchema::IfcProject>()->setName("IfcOpenHouse");
// To demonstrate the ability to serialize arbitrary opencascade solids a building envelope is
// constructed by applying boolean operations. Naturally, in IFC, building elements should be
// modeled separately, with rich parametric and relational semantics. Creating geometry in this
// way does not preserve any history and is merely a demonstration of technical capabilities.
TopoDS_Shape outer = BRepPrimAPI_MakeBox(gp_Pnt(-5000., -180., -2000.), gp_Pnt(5000., 5180., 3000.)).Shape();
TopoDS_Shape inner = BRepPrimAPI_MakeBox(gp_Pnt(-4640., 180., 0.), gp_Pnt(4640., 4820., 3000.)).Shape();
TopoDS_Shape window1 = BRepPrimAPI_MakeBox(gp_Pnt(-5000., -180., 400.), gp_Pnt( 500., 1180., 2000.)).Shape();
TopoDS_Shape window2 = BRepPrimAPI_MakeBox(gp_Pnt( 2070., -180., 400.), gp_Pnt(3930., 180., 2000.)).Shape();
TopoDS_Shape building_shell = BRepAlgoAPI_Cut(
BRepAlgoAPI_Cut(
BRepAlgoAPI_Cut(outer, inner),
window1
),
window2
);
// Since the solid consists only of planar faces and straight edges it can be serialized as an
// IfcFacetedBRep. If it would not be a polyhedron, serialise() can only be successful when linked
// to the IFC4 model and with `advanced` set to `true` which introduces IfcAdvancedFace. It would
// return `0` otherwise.
IfcSchema::IfcProductDefinitionShape* building_shape = IfcGeom::serialise(building_shell, false);
file.addEntity(building_shape);
IfcSchema::IfcRepresentation* rep = *building_shape->Representations()->begin();
rep->setContextOfItems(file.getRepresentationContext("model"));
building->setRepresentation(building_shape);
// A pale white colour is assigned to the building.
file.setSurfaceColour(
building_shape, 0.75, 0.73, 0.68);
// For the ground mesh of the IfcSite we will use a Nurbs surface created in Open Cascade. Only
// in IFC4 the surface can be directly serialized. In IFC2X3 the it will have to be tesselated.
TopoDS_Shape shape;
createGroundShape(shape);
IfcSchema::IfcProductDefinitionShape* ground_representation = IfcGeom::serialise(shape, true);
if (!ground_representation) {
ground_representation = IfcGeom::tesselate(shape, 100.);
}
file.getSingle<IfcSchema::IfcSite>()->setRepresentation(ground_representation);
IfcSchema::IfcRepresentation::list::ptr ground_reps = file.getSingle<IfcSchema::IfcSite>()->Representation()->Representations();
for (IfcSchema::IfcRepresentation::list::it it = ground_reps->begin(); it != ground_reps->end(); ++it) {
(*it)->setContextOfItems(file.getRepresentationContext("Model"));
}
file.addEntity(ground_representation);
file.setSurfaceColour(ground_representation, 0.15, 0.25, 0.05);
/*
// Note that IFC lacks elementary surfaces that STEP does have, such as spherical_surface.
// BRepBuilderAPI_NurbsConvert can be used to serialize such surfaces as nurbs surfaces.
TopoDS_Shape sphere = BRepPrimAPI_MakeSphere(gp_Pnt(), 1000.).Shape();
IfcSchema::IfcProductDefinitionShape* sphere_representation = IfcGeom::serialise(sphere, true);
if (S(IfcSchema::Identifier) == "IFC4") {
sphere = BRepBuilderAPI_NurbsConvert(sphere, true).Shape();
sphere_representation = IfcGeom::serialise(sphere, true);
}
*/
// Finally create a file stream for our output and write the IFC file to it.
std::ofstream f("IfcAdvancedHouse.ifc");
f << file;
}