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.util.element
+
+
+def remove_layer(
+    file: ifcopenshell.file, layer: ifcopenshell.entity_instance, should_remove_material: bool = False
+) -> None:
+    """Removes a layer from a layer set
+
+    Note that it is invalid to have zero items in a set, so you should leave
+    at least one layer to ensure a valid IFC dataset.
+
+    :param layer: The IfcMaterialLayer entity you want to remove
+    :param should_remove_material: If true, materials with no users will be removed
+
+    Example:
+
+    .. code:: python
+
+        # Create a material set for steel stud partition walls.
+        material_set = ifcopenshell.api.material.add_material_set(model,
+            name="Window", set_type="IfcMaterialConstituentSet")
+
+        gypsum = ifcopenshell.api.material.add_material(model, name="PB01", category="gypsum")
+        steel = ifcopenshell.api.material.add_material(model, name="ST01", category="steel")
+
+        # Now let's use those materials as three layers in our set, such
+        # that the steel studs are sandwiched by the gypsum. Let's imagine
+        # we're setting the layer thickness in millimeters.
+        layer1 = ifcopenshell.api.material.add_layer(model, layer_set=material_set, material=gypsum)
+        ifcopenshell.api.material.edit_layer(model, layer=layer1, attributes={"LayerThickness": 13})
+        layer2 = ifcopenshell.api.material.add_layer(model, layer_set=material_set, material=steel)
+        ifcopenshell.api.material.edit_layer(model, layer=layer2, attributes={"LayerThickness": 92})
+        layer3 = ifcopenshell.api.material.add_layer(model, layer_set=material_set, material=gypsum)
+        ifcopenshell.api.material.edit_layer(model, layer=layer3, attributes={"LayerThickness": 13})
+
+        # Let's remove the last layer, such that the wall might be clad only
+        # one one side such as to line a services riser.
+        ifcopenshell.api.material.remove_layer(model, layer=layer3)
+    """
+    material = layer.Material
+    file.remove(layer)
+    if material and should_remove_material:
+        ifcopenshell.util.element.remove_deep2(file, material)