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WKT footprint massaging

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This commit is contained in:
Thomas Krijnen
2025-11-07 10:59:33 +01:00
parent 6dd34b1fa4
commit 7db2f66685
1 changed files with 86 additions and 44 deletions
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src/serializers/TtlWktSerializer.cpp
+86 -44
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@@ -31,6 +31,10 @@
#include <TopoDS.hxx>
#include <Bnd_Box.hxx>
#include <gp_Pln.hxx>
#include <TopoDS_Wire.hxx>
#include <BRepBuilderAPI_MakeFace.hxx>
#include <GProp_GProps.hxx>
#include <BRepGProp.hxx>
#endif
@@ -396,56 +400,94 @@ void TtlWktSerializer::write(const IfcGeom::BRepElement* brep_obj) {
filename_.stream << ttl_object_id(brep_obj) << " geo:hasMetricLength " << height << " .\n\n";
gp_Pln pln(gp_Pnt(0, 0, zmin + section_height), gp::DZ());
std::map<double, std::string> polygons_by_area;
Handle(TopTools_HSequenceOfShape) wires = new TopTools_HSequenceOfShape();
double rectangle_area = (x2 - x1) * (y2 - y1);
bool emitted_warning = false;
size_t N = 0;
TopoDS_Iterator it(compound);
// Iterate over components of compound to have better chance of matching section edges to closed wires
for (; it.More(); it.Next()) {
Handle(TopTools_HSequenceOfShape) edges = new TopTools_HSequenceOfShape();
TopoDS_Shape result = BRepAlgoAPI_Section(it.Value(), pln);
for (int iter = 0; iter < 10; ++iter) {
{
TopExp_Explorer exp(result, TopAbs_EDGE);
for (; exp.More(); exp.Next()) {
edges->Append(exp.Current());
}
}
gp_Pln pln(gp_Pnt(0, 0, zmin + section_height + iter * (height - 1.) / 10.), gp::DZ());
ShapeAnalysis_FreeBounds::ConnectEdgesToWires(edges, 1e-4, false, wires);
for (int i = 1; i <= wires->Length(); ++i) {
const TopoDS_Wire& wire = TopoDS::Wire(wires->Value(i));
BRepTools_WireExplorer it(wire);
std::vector<double> loop_coords;
for (; it.More(); it.Next()) {
const auto& v = it.CurrentVertex();
auto pnt = BRep_Tool::Pnt(v);
loop_coords.push_back(pnt.X());
loop_coords.push_back(pnt.Y());
loop_coords.push_back(pnt.Z());
}
std::vector<int> loop_idxs(loop_coords.size() / 3);
for (int i = 0; i < loop_idxs.size(); ++i) {
loop_idxs[i] = i;
}
Handle(TopTools_HSequenceOfShape) wires = new TopTools_HSequenceOfShape();
std::string postfix = "_section_geometry_" + std::to_string(N++);
size_t N = 0;
TopoDS_Iterator it(compound);
// Iterate over components of compound to have better chance of matching section edges to closed wires
for (; it.More(); it.Next()) {
Handle(TopTools_HSequenceOfShape) edges = new TopTools_HSequenceOfShape();
TopoDS_Shape result = BRepAlgoAPI_Section(it.Value(), pln);
filename_.stream << ttl_object_id(brep_obj) << " geo:hasGeometry " << ttl_object_id(brep_obj, postfix.c_str()) << " .\n\n";
filename_.stream << ttl_object_id(brep_obj, postfix.c_str()) << " a geo:Geometry ;\n";
filename_.stream << " geo:asWKT " << escape_for_turtle(
IfcUtil::convert_utf8(
capture_output(
emit_line_component,
loop_coords,
loop_idxs,
true,
POLYGON))
) << "^^geo:wktLiteral .\n\n";
}
}
{
TopExp_Explorer exp(result, TopAbs_EDGE);
for (; exp.More(); exp.Next()) {
edges->Append(exp.Current());
}
}
ShapeAnalysis_FreeBounds::ConnectEdgesToWires(edges, 1e-4, false, wires);
for (int i = 1; i <= wires->Length(); ++i) {
const TopoDS_Wire& wire = TopoDS::Wire(wires->Value(i));
if (!wire.Closed()) {
continue;
}
BRepBuilderAPI_MakeFace mf(wire);
if (!mf.IsDone()) {
continue;
}
auto face = mf.Face();
// calculate face area
GProp_GProps props;
BRepGProp::SurfaceProperties(face, props);
auto area = props.Mass();
BRepTools_WireExplorer it(wire);
std::vector<double> loop_coords;
for (; it.More(); it.Next()) {
const auto& v = it.CurrentVertex();
auto pnt = BRep_Tool::Pnt(v);
loop_coords.push_back(pnt.X());
loop_coords.push_back(pnt.Y());
loop_coords.push_back(pnt.Z());
}
std::vector<int> loop_idxs(loop_coords.size() / 3);
for (int i = 0; i < loop_idxs.size(); ++i) {
loop_idxs[i] = i;
}
std::string postfix = "_section_geometry_" + std::to_string(N++);
std::ostringstream oss;
oss << ttl_object_id(brep_obj) << " geo:hasGeometry " << ttl_object_id(brep_obj, postfix.c_str()) << " .\n\n";
oss << ttl_object_id(brep_obj, postfix.c_str()) << " a geo:Geometry ;\n";
oss << " geo:asWKT " << escape_for_turtle(IfcUtil::convert_utf8(capture_output(emit_line_component, loop_coords, loop_idxs, true, POLYGON))) << "^^geo:wktLiteral .\n\n";
polygons_by_area[area] = oss.str();
}
}
if (polygons_by_area.size() > 0) {
if ((polygons_by_area.rbegin()->first > (0.6 * rectangle_area)) || (height < (1. + 1.e-5))) {
// Found sufficiently large polygon
if (emitted_warning) {
Logger::Warning("Found larger polygon area (" + std::to_string(polygons_by_area.rbegin()->first) + ").");
}
break;
} else if (!emitted_warning) {
Logger::Warning("Section polygon area is small compared to bounding box area (" + std::to_string(polygons_by_area.rbegin()->first) + " < " + std::to_string(0.6 * rectangle_area) + "). Trying again with different section height.");
emitted_warning = true;
}
}
}
if (polygons_by_area.size() > 0) {
// Emit polygon with largest area
auto it = polygons_by_area.rbegin();
filename_.stream << it->second;
}
#endif
}