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Count number of emitted normals in OBJ serializer, which might be less than verts when writing line geometries

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This commit is contained in:
Thomas Krijnen
2025-12-02 16:32:37 +01:00
parent 1468bf3c97
commit 4fc2f623cf
4 changed files with 116 additions and 13 deletions
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src/serializers/WavefrontObjSerializer.cpp
+18 -12
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@@ -93,7 +93,9 @@ void WaveFrontOBJSerializer::write(const IfcGeom::TriangulationElement* o)
const IfcGeom::Representation::Triangulation& mesh = o->geometry();
const int vcount = (int)mesh.verts().size() / 3;
size_t vcount = mesh.verts().size() / 3;
size_t ncount = mesh.normals().size() / 3;
for (auto it = mesh.verts().begin(); it != mesh.verts().end();) {
const double x = *(it++);
const double y = *(it++);
@@ -139,22 +141,25 @@ void WaveFrontOBJSerializer::write(const IfcGeom::TriangulationElement* o)
previous_material_id = material_id;
}
const int v1 = *(it++)+vcount_total;
const int v2 = *(it++)+vcount_total;
const int v3 = *(it++)+vcount_total;
const int v1 = *(it++) + vcount_total;
const int v2 = *(it++) + vcount_total;
const int v3 = *(it++) + vcount_total;
if (has_normals && has_uvs) {
obj_stream.stream << "f " << v1 << "/" << v1 << "/" << v1 << " "
<< v2 << "/" << v2 << "/" << v2 << " "
<< v3 << "/" << v3 << "/" << v3 << "\n";
const int n1 = v1 - vcount_total + ncount_total;
const int n2 = v2 - vcount_total + ncount_total;
const int n3 = v3 - vcount_total + ncount_total;
if (has_normals && has_uvs) {
obj_stream.stream << "f " << v1 << "/" << n1 << "/" << n1 << " "
<< v2 << "/" << n2 << "/" << n2 << " "
<< v3 << "/" << n3 << "/" << n3 << "\n";
} else if (has_normals) {
obj_stream.stream << "f " << v1 << "//" << v1 << " "
<< v2 << "//" << v2 << " "
<< v3 << "//" << v3 << "\n";
obj_stream.stream << "f " << v1 << "//" << n1 << " "
<< v2 << "//" << n2 << " "
<< v3 << "//" << n3 << "\n";
} else {
obj_stream.stream << "f " << v1 << " " << v2 << " " << v3 << "\n";
}
}
std::set<int> faces_set (mesh.faces().begin(), mesh.faces().end());
@@ -189,4 +194,5 @@ void WaveFrontOBJSerializer::write(const IfcGeom::TriangulationElement* o)
}
vcount_total += vcount;
ncount_total += ncount;
}