First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
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+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 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
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+import ifcopenshell.api.aggregate
+import ifcopenshell.api.root
+import ifcopenshell.util.element
+
+
+def remove_feature(file: ifcopenshell.file, feature: ifcopenshell.entity_instance) -> None:
+    """Permanently delete a feature element and its void or projection relationship.
+
+    The feature entity (e.g. IfcOpeningElement) is removed from the model
+    along with its IfcRelVoidsElement or IfcRelProjectsElement relationship.
+    The host element (wall, slab, etc.) is unaffected. Any fillings (windows,
+    doors) that occupied the opening become orphaned and must be separately
+    deleted via root.remove_product.
+
+    :param feature: The IfcFeatureElement to remove.
+
+    Example:
+
+    .. code:: python
+
+        # Create an orphaned opening. Note that an orphaned opening is
+        # invalid, as an opening can only exist when voiding another
+        # element.
+        feature = ifcopenshell.api.root.create_entity(model, ifc_class="IfcOpeningElement")
+
+        # Remove it. This brings us back to a valid model.
+        ifcopenshell.api.feature.remove_feature(model, feature=feature)
+    """
+    if feature.is_a("IfcFeatureElementSubtraction"):
+        rels = feature.VoidsElements
+    elif feature.is_a("IfcFeatureElementAddition"):
+        rels = feature.ProjectsElements
+    elif feature.is_a("IfcSurfaceFeature"):
+        if file.schema == "IFC4":
+            ifcopenshell.api.aggregate.unassign_object(file, products=[feature])
+            rels = []
+        else:
+            rels = feature.ProjectsElements
+    for rel in rels:
+        history = rel.OwnerHistory
+        file.remove(rel)
+        if history:
+            ifcopenshell.util.element.remove_deep2(file, history)
+    if feature.is_a("IfcOpeningElement"):
+        for rel in feature.HasFillings:
+            history = rel.OwnerHistory
+            file.remove(rel)
+            if history:
+                ifcopenshell.util.element.remove_deep2(file, history)
+    ifcopenshell.api.root.remove_product(file, product=feature)