First Commit
This commit is contained in:
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# 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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"""Assign spatial relationships such as when an element is in a space
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Physical elements (walls, doors, etc) may be contained in or reference spatial
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elements (spaces, storeys, buildings, etc).
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"""
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from .. import wrap_usecases
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from .assign_container import assign_container
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from .dereference_structure import dereference_structure
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from .reference_structure import reference_structure
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from .unassign_container import unassign_container
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wrap_usecases(__path__, __name__)
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__all__ = [
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"assign_container",
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"dereference_structure",
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"reference_structure",
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"unassign_container",
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]
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# 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
|
||||
# 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
|
||||
# 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
|
||||
# along with IfcOpenShell. If not, see <http://www.gnu.org/licenses/>.
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from typing import Union
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import ifcopenshell
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import ifcopenshell.api.aggregate
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import ifcopenshell.api.geometry
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import ifcopenshell.api.owner
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import ifcopenshell.guid
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import ifcopenshell.util.element
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import ifcopenshell.util.placement
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def assign_container(
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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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) -> Union[ifcopenshell.entity_instance, None]:
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"""Assigns products to be contained hierarchically in a space
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All physical IFC model elements must be part of a hierarchical tree
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called the "spatial decomposition", where large things are made up of
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smaller things. This tree always begins at an "IfcProject" and is then
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broken down using "decomposition" relationships, of which aggregation is
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the first relationship you will use. See
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ifcopenshell.api.aggregate.assign_object for more details about
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aggregation.
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The IfcProject will be "decomposed" into spatial structure elements.
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These are virtual spaces like stes, buildings, storeys, and spaces (i.e.
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rooms). You can't physically touch these spaces, but you can touch the
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products contained within these spaces.
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To state that a product is contained in a space, you will use a
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"containment" relationship. Containment is a very common relationship
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used to create the hierarchical spatial decomposition tree. For example,
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you might say that "This wall is on the third building storey", or "this
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table is in the living room space".
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The distinguishing factor between aggregation and containment is that
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aggregation occurs between objects of the same type (e.g. a large space
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is made up of smaller spaces), whereas containment is between two
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different types: explicitly saying that a physical product exists within
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a virtual space.
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Containment is critical in construction management, to know which
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objects are in which spaces, as often you would divide your construction
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schedule into storey by storey, or zone by zone. Containment is also
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critical in facility management, as it indicates through which space
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equipment may be accessed for maintenance purposes.
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As a product may only have a single location in the "spatial
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decomposition" tree, assigning an aggregate relationship will remove any
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previous aggregation, containment, or nesting relationships it may have.
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:param products: A list of physical IfcElements existing 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: The IfcRelContainedInSpatialStructure relationship instance
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or `None` if `products` was empty list.
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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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storey = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuildingStorey")
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space = ifcopenshell.api.root.create_entity(model, ifc_class="IfcSpace")
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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 wall and furniture
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wall = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
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furniture = ifcopenshell.api.root.create_entity(model, ifc_class="IfcFurniture")
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# The wall is in the storey, and the furniture is in the space
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ifcopenshell.api.spatial.assign_container(model, products=[wall], relating_structure=storey)
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ifcopenshell.api.spatial.assign_container(model, products=[furniture], relating_structure=space)
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"""
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if not products:
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return
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products_set = set(products)
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structure_rel = next(iter(relating_structure.ContainsElements), None)
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previous_containers_rels: set[ifcopenshell.entity_instance] = set()
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products_without_containers: list[ifcopenshell.entity_instance] = []
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products_with_containers: list[ifcopenshell.entity_instance] = []
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# check if there is anything to change
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for product in products_set:
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product_rel = next(iter(product.ContainedInStructure), None)
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if product_rel is None:
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products_without_containers.append(product)
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continue
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# either structure_rel is None or product is part of different rel
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if product_rel != structure_rel:
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previous_containers_rels.add(product_rel)
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products_with_containers.append(product)
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# products with already assigned containers will be skipped
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products_to_change = products_without_containers + products_with_containers
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# nothing to change
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if not products_to_change:
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return structure_rel
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# can be either only aggregated or only contained at the same time
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ifcopenshell.api.aggregate.unassign_object(file, products=products_without_containers)
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# unassign elements from previous containers
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for rel in previous_containers_rels:
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related_elements = set(rel.RelatedElements) - 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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# assign elements to a new container
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if structure_rel:
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structure_rel.RelatedElements = list(set(structure_rel.RelatedElements) | products_set)
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ifcopenshell.api.owner.update_owner_history(file, element=structure_rel)
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else:
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structure_rel = file.create_entity(
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"IfcRelContainedInSpatialStructure",
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**{
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"GlobalId": ifcopenshell.guid.new(),
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"OwnerHistory": ifcopenshell.api.owner.create_owner_history(file),
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"RelatedElements": list(products_set),
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"RelatingStructure": relating_structure,
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}
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)
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# localize placement relative to a new container for affected products
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for product in products_to_change:
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placement = getattr(product, "ObjectPlacement", None)
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if placement and placement.is_a("IfcLocalPlacement"):
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ifcopenshell.api.geometry.edit_object_placement(
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file,
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product=product,
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matrix=ifcopenshell.util.placement.get_local_placement(product.ObjectPlacement),
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is_si=False,
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)
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return structure_rel
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@@ -0,0 +1,82 @@
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# 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
|
||||
# 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/>.
|
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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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@@ -0,0 +1,119 @@
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# IfcOpenShell - IFC toolkit and geometry engine
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# Copyright (C) 2022 Dion Moult <dion@thinkmoult.com>
|
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#
|
||||
# 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/>.
|
||||
|
||||
from typing import Union
|
||||
|
||||
import ifcopenshell
|
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import ifcopenshell.api.owner
|
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import ifcopenshell.guid
|
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import ifcopenshell.util.element
|
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|
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def reference_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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) -> Union[ifcopenshell.entity_instance, None]:
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"""Denote that a list products is related to a list of spatial structures
|
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This is similar to ifcopenshell.api.spatial.assign_container, except
|
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that containment can only occur between a product and a single spatial
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structure element. This is fine if a wall is on level 1, but not
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appropriate if you have a multistorey column on multiple levels, or a
|
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door with a to and from space, or a stair going from one floor to
|
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another floor. This is where spatial referencing is used.
|
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Typically, the product will be contained in the lowermost, constructed
|
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first, or primarily accessible space. For a multistorey column or stair,
|
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the column or stair will therefore be contained in the lowermost storey.
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Then, any other storeys will be referenced.
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|
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Referencing is non-hierarchical, so a door may be referenced in multiple
|
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spaces simultaneously.
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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: The IfcRelReferencedInSpatialStructure relationship instance
|
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or `None` if `products` was an empty list.
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Example:
|
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|
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.. code:: python
|
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|
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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")
|
||||
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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space = ifcopenshell.api.root.create_entity(model, ifc_class="IfcSpace")
|
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|
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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)
|
||||
|
||||
# The site has a building, the building has a storey, and the storey has a space
|
||||
ifcopenshell.api.aggregate.assign_object(model, products=[building], relating_object=site)
|
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ifcopenshell.api.aggregate.assign_object(model, products=[storey1,storey2,storey3], relating_object=building)
|
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ifcopenshell.api.aggregate.assign_object(model, products=[space], relating_object=storey1)
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|
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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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|
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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(
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model, products=[column], relating_structure=storey2
|
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)
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ifcopenshell.api.spatial.reference_structure(
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model, products=[column], relating_structure=storey3
|
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)
|
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"""
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structure = relating_structure
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products_set = set(products)
|
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|
||||
if not products_set:
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return
|
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|
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referenced = ifcopenshell.util.element.get_structure_referenced_elements(structure)
|
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products_to_assign = products_set - referenced
|
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rel: Union[ifcopenshell.entity_instance, None]
|
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rel = next(iter(structure.ReferencesElements), None)
|
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|
||||
if not products_to_assign:
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return rel
|
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|
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if rel is None:
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rel = file.create_entity(
|
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"IfcRelReferencedInSpatialStructure",
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||||
GlobalId=ifcopenshell.guid.new(),
|
||||
OwnerHistory=ifcopenshell.api.owner.create_owner_history(file),
|
||||
RelatedElements=list(products_to_assign),
|
||||
RelatingStructure=structure,
|
||||
)
|
||||
else:
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related_elements = set(rel.RelatedElements) | products_to_assign
|
||||
rel.RelatedElements = list(related_elements)
|
||||
ifcopenshell.api.owner.update_owner_history(file, element=rel)
|
||||
|
||||
return rel
|
||||
@@ -0,0 +1,67 @@
|
||||
# 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.owner
|
||||
import ifcopenshell.util.element
|
||||
|
||||
|
||||
def unassign_container(file: ifcopenshell.file, products: list[ifcopenshell.entity_instance]) -> None:
|
||||
"""Unassigns a container from products.
|
||||
|
||||
:param product: A list of IfcProducts to remove the containment from.
|
||||
:return: None
|
||||
|
||||
Example:
|
||||
|
||||
.. code:: python
|
||||
|
||||
project = ifcopenshell.api.root.create_entity(model, ifc_class="IfcProject")
|
||||
site = ifcopenshell.api.root.create_entity(model, ifc_class="IfcSite")
|
||||
building = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuilding")
|
||||
storey = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuildingStorey")
|
||||
|
||||
# The project contains a site (note that project aggregation is a special case in IFC)
|
||||
ifcopenshell.api.aggregate.assign_object(model, products=[site], relating_object=project)
|
||||
|
||||
# The site has a building, the building has a storey, and the storey has a space
|
||||
ifcopenshell.api.aggregate.assign_object(model, products=[building], relating_object=site)
|
||||
ifcopenshell.api.aggregate.assign_object(model, products=[storey], relating_object=building)
|
||||
|
||||
# Create a wall
|
||||
wall = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
|
||||
|
||||
# The wall is in the storey
|
||||
ifcopenshell.api.spatial.assign_container(model, products=[wall], relating_structure=storey)
|
||||
|
||||
# Not anymore!
|
||||
ifcopenshell.api.spatial.unassign_container(model, products=[wall])
|
||||
"""
|
||||
products_set = set(products)
|
||||
rels = set(rel for product in products_set if (rel := next(iter(product.ContainedInStructure), None)))
|
||||
|
||||
for rel in rels:
|
||||
related_elements = set(rel.RelatedElements) - products_set
|
||||
if related_elements:
|
||||
rel.RelatedElements = list(related_elements)
|
||||
ifcopenshell.api.owner.update_owner_history(file, element=rel)
|
||||
else:
|
||||
history = rel.OwnerHistory
|
||||
file.remove(rel)
|
||||
if history:
|
||||
ifcopenshell.util.element.remove_deep2(file, history)
|
||||
Reference in New Issue
Block a user