93 lines
4.1 KiB
Python
93 lines
4.1 KiB
Python
# IfcOpenShell - IFC toolkit and geometry engine
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# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
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#
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# This file is part of IfcOpenShell.
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#
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# IfcOpenShell is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# IfcOpenShell is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with IfcOpenShell. If not, see <http://www.gnu.org/licenses/>.
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import ifcopenshell.util.element
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def remove_representation(
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file: ifcopenshell.file, representation: ifcopenshell.entity_instance, should_keep_named_profiles: bool = True
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) -> None:
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"""Remove a representation.
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Also purges representation items and their related elements
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like IfcStyledItem, tessellated facesets colours and UV map.
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By default, named profiles are assumed to be significant (i.e. curated as
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part of a profile library) and will not be removed.
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:param representation: IfcRepresentation to remove.
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Note that it's expected that IfcRepresentation won't be in use
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before calling this method (in such elements as IfcProductRepresentation, IfcShapeAspect)
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otherwise representation won't be removed.
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:param should_keep_named_profiles: If true, named profile defs will not be
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removed as they are assumed to be significant.
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"""
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is_ifc2x3 = file.schema == "IFC2X3"
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styled_items = set()
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presentation_layer_assignments_items: set[ifcopenshell.entity_instance] = set()
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presentation_layer_assignments_reps: set[ifcopenshell.entity_instance] = set()
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textures: set[ifcopenshell.entity_instance] = set()
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colours: set[ifcopenshell.entity_instance] = set()
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named_profiles: set[ifcopenshell.entity_instance] = set()
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for subelement in file.traverse(representation):
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if subelement.is_a("IfcRepresentationItem"):
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[styled_items.add(s) for s in subelement.StyledByItem or []]
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# IFC2X3 is using LayerAssignments
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for s in subelement.LayerAssignment if not is_ifc2x3 else subelement.LayerAssignments:
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presentation_layer_assignments_items.add(s)
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# IfcTessellatedFaceSet inverses
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if subelement.is_a("IfcTessellatedFaceSet"):
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textures.update(subelement.HasTextures)
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colours.update(subelement.HasColours)
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elif subelement.is_a("IfcRepresentation"):
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for layer in subelement.LayerAssignments:
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presentation_layer_assignments_reps.add(layer)
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elif subelement.is_a("IfcProfileDef") and subelement.ProfileName:
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named_profiles.add(subelement)
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do_not_delete = file.by_type("IfcGeometricRepresentationContext")
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if should_keep_named_profiles:
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do_not_delete += named_profiles
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# Order matters - layer assignments may reference representation directly.
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also_consider = list(presentation_layer_assignments_reps)
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also_consider.extend(presentation_layer_assignments_items - presentation_layer_assignments_reps)
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also_consider.extend(styled_items)
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also_consider.extend(textures)
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ifcopenshell.util.element.remove_deep2(
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file,
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representation,
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also_consider=also_consider,
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do_not_delete=set(do_not_delete),
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)
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for texture in textures:
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ifcopenshell.util.element.remove_deep2(file, texture)
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for colour in colours:
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ifcopenshell.util.element.remove_deep2(file, colour)
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to_delete = file.to_delete or set()
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for element in styled_items:
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item = element.Item
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if not item or item in to_delete:
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file.remove(element)
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presentation_layer_assignments = presentation_layer_assignments_reps | presentation_layer_assignments_items
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for element in presentation_layer_assignments:
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if all(item in to_delete for item in element.AssignedItems):
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file.remove(element)
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