83 lines
3.8 KiB
Python
83 lines
3.8 KiB
Python
# IfcOpenShell - IFC toolkit and geometry engine
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# Copyright (C) 2022 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
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import ifcopenshell.api.owner
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import ifcopenshell.util.element
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def dereference_structure(
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file: ifcopenshell.file,
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products: list[ifcopenshell.entity_instance],
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relating_structure: ifcopenshell.entity_instance,
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) -> None:
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"""Dereferences a list of products and space
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:param products: The list of physical IfcElements that exists in the space.
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:param relating_structure: The IfcSpatialStructureElement element, such
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as IfcBuilding, IfcBuildingStorey, or IfcSpace that the element
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exists in.
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:return: None
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Example:
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.. code:: python
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project = ifcopenshell.api.root.create_entity(model, ifc_class="IfcProject")
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site = ifcopenshell.api.root.create_entity(model, ifc_class="IfcSite")
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building = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuilding")
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storey1 = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuildingStorey")
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storey2 = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuildingStorey")
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storey3 = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuildingStorey")
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# The project contains a site (note that project aggregation is a special case in IFC)
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ifcopenshell.api.aggregate.assign_object(model, products=[site], relating_object=project)
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# The site has a building, the building has a storey, and the storey has a space
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ifcopenshell.api.aggregate.assign_object(model, products=[building], relating_object=site)
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ifcopenshell.api.aggregate.assign_object(model, products=[storey], relating_object=building)
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ifcopenshell.api.aggregate.assign_object(model, products=[space], relating_object=storey)
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# Create a column, this column spans 3 storeys
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column = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
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# The column is contained in the lowermost storey
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ifcopenshell.api.spatial.assign_container(model, products=[column], relating_structure=storey1)
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# And referenced in the others
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ifcopenshell.api.spatial.reference_structure(model, products=[column], relating_structure=storey2)
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ifcopenshell.api.spatial.reference_structure(model, products=[column], relating_structure=storey3)
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# Actually, it only goes up to storey 2.
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ifcopenshell.api.spatial.dereference_structure(model, products=[column], relating_structure=storey3)
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"""
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products_set = set(products)
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for rel in relating_structure.ReferencesElements:
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related_elements = set(rel.RelatedElements)
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if not related_elements.intersection(products_set):
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continue
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related_elements = related_elements - products_set
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if related_elements:
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rel.RelatedElements = list(related_elements)
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ifcopenshell.api.owner.update_owner_history(file, element=rel)
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else:
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history = rel.OwnerHistory
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file.remove(rel)
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if history:
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ifcopenshell.util.element.remove_deep2(file, history)
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