First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
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+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2022 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
+import ifcopenshell.api.material
+import ifcopenshell.util.element
+
+
+def remove_material_set(file: ifcopenshell.file, material: ifcopenshell.entity_instance) -> None:
+    """Removes a material set
+
+    All set items, such as layers, profiles, or constituents will also be
+    removed. All set usages are also removed.
+
+    However, the materials and profile curves used by the layers,
+    profiles and constituents will not be removed.
+
+    :param material: The IfcMaterialLayerSet, IfcMaterialConstituentSet,
+        IfcMaterialProfileSet entity you want to remove.
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        # Create a material set
+        material_set = ifcopenshell.api.material.add_material_set(model,
+            name="GYP-ST-GYP", set_type="IfcMaterialLayerSet")
+
+        # Create some materials
+        gypsum = ifcopenshell.api.material.add_material(model, name="PB01", category="gypsum")
+        steel = ifcopenshell.api.material.add_material(model, name="ST01", category="steel")
+
+        # Add some layers
+        layer = ifcopenshell.api.material.add_layer(model, layer_set=material_set, material=gypsum)
+        layer = ifcopenshell.api.material.add_layer(model, layer_set=material_set, material=steel)
+        layer = ifcopenshell.api.material.add_layer(model, layer_set=material_set, material=gypsum)
+
+        # Completely delete the set and all layers. The gypsum and steel
+        # material still exist, though.
+        ifcopenshell.api.material.remove_material_set(model, material=material_set)
+    """
+
+    # Remove all usages for sets.
+    has_usages = material.is_a("IfcMaterialLayerSet") or material.is_a("IfcMaterialProfileSet")
+    if has_usages:
+        # Usage is invalid if it is not associated with some element,
+        # so we can remove usages through unassignment.
+        elements = ifcopenshell.util.element.get_elements_by_material(file, material)
+        if elements:
+            ifcopenshell.api.material.unassign_material(file, products=list(elements))
+
+    if material.is_a("IfcMaterialLayerSet"):
+        set_items = material.MaterialLayers or []
+    elif material.is_a("IfcMaterialProfileSet"):
+        set_items = material.MaterialProfiles or []
+    elif material.is_a("IfcMaterialConstituentSet"):
+        set_items = material.MaterialConstituents or []
+    elif material.is_a("IfcMaterialList"):
+        set_items = []
+    else:
+        raise ValueError(f"Unknown material set type: {material.is_a()}")
+    for set_item in set_items:
+        file.remove(set_item)
+
+    inverse_elements = file.get_inverse(material)
+    file.remove(material)
+
+    for inverse in inverse_elements:
+        if inverse.is_a("IfcRelAssociatesMaterial"):
+            # NOTE: for has_usages already handled by unassign_material.
+            history = inverse.OwnerHistory
+            file.remove(inverse)
+            if history:
+                ifcopenshell.util.element.remove_deep2(file, history)
+        elif inverse.is_a("IfcMaterialProperties"):
+            for prop in inverse.Properties or []:
+                file.remove(prop)
+            file.remove(inverse)