First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
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+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2023 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.style
+import ifcopenshell.util.element
+
+
+def unassign_material_style(
+    file: ifcopenshell.file,
+    material: ifcopenshell.entity_instance,
+    style: ifcopenshell.entity_instance,
+    context: ifcopenshell.entity_instance,
+) -> None:
+    """Unassigns a style to a material
+
+    This does the inverse of assign_material_style.
+
+    :param material: The IfcMaterial which you want to unassign the style from.
+    :param style: The IfcPresentationStyle (typically IfcSurfaceStyle) that
+        you want to unassign from material. This will then be applied to all
+        objects that have that material.
+    :param context: The IfcGeometricRepresentationSubContext at which this
+        style should be unassigned. Typically this is the Model BODY context.
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        ifcopenshell.api.style.unassign_material_style(model, material=concrete, style=style, context=body)
+    """
+    settings = {
+        "material": material,
+        "style": style,
+        "context": context,
+    }
+
+    for definition in settings["material"].HasRepresentation:
+        for representation in definition.Representations:
+            if not representation.is_a("IfcStyledRepresentation"):
+                continue
+            if representation.ContextOfItems != settings["context"]:
+                continue
+            for item in representation.Items:
+                if not item.is_a("IfcStyledItem"):
+                    continue
+                styles = []
+                for s in item.Styles:
+                    if s == settings["style"]:
+                        continue
+                    if s.is_a("IfcPresentationStyleAssignment"):
+                        if s.Styles == (settings["style"],):
+                            continue
+                    styles.append(s)
+                if not styles:
+                    file.remove(item)
+                elif len(styles) != len(item.Styles):
+                    item.Styles = styles
+            if not representation.Items:
+                file.remove(representation)
+        if not definition.Representations:
+            file.remove(definition)
+
+    # handle material constituents and shape aspects
+    material_constituents_names = []
+    for inverse in file.get_inverse(settings["material"]):
+        if inverse.is_a("IfcMaterialConstituent") and inverse.Name:
+            material_constituents_names.append(inverse.Name)
+    if not material_constituents_names:
+        return
+
+    elements = ifcopenshell.util.element.get_elements_by_material(file, settings["material"])
+    shape_aspects = []
+    for element in elements:
+        shape_aspects += ifcopenshell.util.element.get_shape_aspects(element)
+
+    for shape_aspect in shape_aspects:
+        if shape_aspect.Name not in material_constituents_names:
+            continue
+
+        for rep in shape_aspect.ShapeRepresentations:
+            ifcopenshell.api.style.unassign_representation_styles(
+                file, shape_representation=rep, styles=[settings["style"]]
+            )