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Option to retain original edges in cgal for non-boolean non-face-with-voids inputs #6173

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This commit is contained in:
Thomas Krijnen
2025-02-23 14:46:10 +01:00
parent ce26af5a7e
commit 5599e52184
2 changed files with 35 additions and 16 deletions
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src/ifcgeom/kernels/cgal/CgalConversionResult.cpp
+29 -14
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@@ -144,10 +144,15 @@ ifcopenshell::geometry::CgalShape::CgalShape(const cgal_shape_t& shape, bool con
}
if (shape.size_of_facets() != 1) {
// this is for handling the specical case of storing a single point in a polyhedron,
// the size_of_facets() == 1 check is for handling the specical case of
// storing a single point in a polyhedron as a degenerate triangle
//
// @todo come up with a proper variant for storing lower dimensional entities
CGAL::Polygon_mesh_processing::triangulate_faces(*shape_);
CGAL::Polygon_mesh_processing::remove_degenerate_faces(*shape_);
// @todo we don't have access to settings here so we don't know whether we should triangulate
// remove_degenerate_faces() is also called in the triangulate() call below though...
// CGAL::Polygon_mesh_processing::triangulate_faces(*shape_);
// CGAL::Polygon_mesh_processing::remove_degenerate_faces(*shape_);
}
}
@@ -183,6 +188,15 @@ void ifcopenshell::geometry::CgalShape::Triangulate(ifcopenshell::geometry::Sett
// ... also becuase of transforming the vertex positions, right?
cgal_shape_t s = *this;
const bool setting_use_original_edges = settings.get<ifcopenshell::geometry::settings::CgalEmitOriginalEdges>().get();
std::set<std::set<Kernel_::Point_3>> original_edges;
if (setting_use_original_edges) {
for (auto it = s.edges_begin(); it != s.edges_end(); ++it) {
original_edges.insert({ it->vertex()->point(), it->prev()->vertex()->point() });
}
}
if (!place.is_identity()) {
const auto& m = place.ccomponents();
@@ -199,14 +213,11 @@ void ifcopenshell::geometry::CgalShape::Triangulate(ifcopenshell::geometry::Sett
}
if (!std::all_of(s.facets_begin(), s.facets_end(), [](auto f) { return f.is_triangle(); })) {
if (!s.is_valid()) {
Logger::Message(Logger::LOG_ERROR, "Invalid Polyhedron_3 in object (before triangulation)");
return;
}
CGAL::Polygon_mesh_processing::remove_degenerate_faces(s);
bool success = false;
try {
success = CGAL::Polygon_mesh_processing::triangulate_faces(s);
@@ -215,27 +226,29 @@ void ifcopenshell::geometry::CgalShape::Triangulate(ifcopenshell::geometry::Sett
return;
}
CGAL::Polygon_mesh_processing::remove_degenerate_faces(s);
if (!success) {
Logger::Message(Logger::LOG_ERROR, "Triangulation failed");
return;
}
// std::cout << "Triangulated model: " << s.size_of_facets() << " facets and " << s.size_of_vertices() << " vertices" << std::endl;
if (!s.is_valid()) {
Logger::Message(Logger::LOG_ERROR, "Invalid Polyhedron_3 in object (after triangulation)");
// return;
}
}
// Facet -> planar component map for determining which
// edges are to be registered.
std::vector<std::set<Facet_const_handle>> components;
partition_coplanar_components(s, components);
std::map<Facet_const_handle, typename decltype(components)::const_iterator> facet_to_component;
for (auto it = components.begin(); it != components.end(); ++it) {
for (auto& f : *it) {
facet_to_component[f] = it;
if (!setting_use_original_edges) {
partition_coplanar_components(s, components);
for (auto it = components.begin(); it != components.end(); ++it) {
for (auto& f : *it) {
facet_to_component[f] = it;
}
}
}
@@ -305,8 +318,10 @@ void ifcopenshell::geometry::CgalShape::Triangulate(ifcopenshell::geometry::Sett
}
vertexidx[i] = (int)vidx;
is_face_boundary[i] = facet_to_component[face] != facet_to_component[current_halfedge->opposite()->face()];
is_face_boundary[i] = setting_use_original_edges
? original_edges.find({ current_halfedge->vertex()->point(), current_halfedge->prev()->vertex()->point() }) != original_edges.end()
: facet_to_component[face] != facet_to_component[current_halfedge->opposite()->face()];
++i;
++num_vertices;
++current_halfedge;