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Write documentation for spatial API module
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Dion Moult
@@ -22,14 +22,81 @@ import ifcopenshell.util.placement
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class Usecase:
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def __init__(self, file, **settings):
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def __init__(self, file, product=None, relating_structure=None):
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"""Assigns a product 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 locaion 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 product: The physical IfcElement that exists in the space.
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:type product: ifcopenshell.entity_instance.entity_instance
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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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:rtype: ifcopenshell.entity_instance.entity_instance
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Example::
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project = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcProject")
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site = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcSite")
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building = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuilding")
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storey = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuildingStorey")
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space = ifcopenshell.api.run("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.run("aggregate.assign_object", model, product=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.run("aggregate.assign_object", model, product=building, relating_object=site)
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ifcopenshell.api.run("aggregate.assign_object", model, product=storey, relating_object=building)
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ifcopenshell.api.run("aggregate.assign_object", model, product=space, relating_object=storey)
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# Create a wall and furniture
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wall = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcWall")
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furniture = ifcopenshell.api.run("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.run("spatial.assign_container", model, product=wall, relating_structure=storey)
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ifcopenshell.api.run("spatial.assign_container", model, product=furniture, relating_structure=space)
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"""
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self.file = file
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self.settings = {
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"product": None,
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"relating_structure": None,
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"product": product,
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"relating_structure": relating_structure,
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}
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for key, value in settings.items():
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self.settings[key] = value
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def execute(self):
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contained_in_structure = self.settings["product"].ContainedInStructure
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@@ -21,11 +21,49 @@ import ifcopenshell.api
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class Usecase:
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def __init__(self, file, **settings):
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def __init__(self, file, product=None, relating_structure=None):
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"""Dereferences the a product and space
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:param product: The physical IfcElement that exists in the space.
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:type product: ifcopenshell.entity_instance.entity_instance
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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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:rtype: None
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Example::
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project = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcProject")
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site = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcSite")
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building = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuilding")
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storey1 = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuildingStorey")
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storey2 = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuildingStorey")
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storey3 = ifcopenshell.api.run("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.run("aggregate.assign_object", model, product=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.run("aggregate.assign_object", model, product=building, relating_object=site)
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ifcopenshell.api.run("aggregate.assign_object", model, product=storey, relating_object=building)
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ifcopenshell.api.run("aggregate.assign_object", model, product=space, relating_object=storey)
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# Create a column, this column spans 3 storeys
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column = ifcopenshell.api.run("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.run("spatial.assign_container", model, product=column, relating_structure=storey1)
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# And referenced in the others
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ifcopenshell.api.run("spatial.reference_structure", model, product=column, relating_structure=storey2)
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ifcopenshell.api.run("spatial.reference_structure", model, product=column, relating_structure=storey3)
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# Actually, it only goes up to storey 2.
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ifcopenshell.api.run("spatial.dereference_structure", model, product=column, relating_structure=storey3)
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"""
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self.file = file
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self.settings = {"product": None, "relating_structure": None}
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for key, value in settings.items():
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self.settings[key] = value
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self.settings = {"product": product, "relating_structure": relating_structure}
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def execute(self):
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for rel in self.settings["product"].ReferencedInStructures:
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@@ -21,14 +21,64 @@ import ifcopenshell.api
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class Usecase:
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def __init__(self, file, **settings):
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def __init__(self, file, product=None, relating_structure=None):
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"""Denote that a product is related to a spatial structure
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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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Referencing is non-hierarchical, so a door may be referenced in multiple
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spaces simultaneously.
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:param product: The physical IfcElement that exists in the space.
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:type product: ifcopenshell.entity_instance.entity_instance
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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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:rtype: ifcopenshell.entity_instance.entity_instance
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Example::
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project = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcProject")
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site = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcSite")
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building = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuilding")
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storey1 = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuildingStorey")
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storey2 = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuildingStorey")
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storey3 = ifcopenshell.api.run("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.run("aggregate.assign_object", model, product=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.run("aggregate.assign_object", model, product=building, relating_object=site)
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ifcopenshell.api.run("aggregate.assign_object", model, product=storey, relating_object=building)
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ifcopenshell.api.run("aggregate.assign_object", model, product=space, relating_object=storey)
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# Create a column, this column spans 3 storeys
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column = ifcopenshell.api.run("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.run("spatial.assign_container", model, product=column, relating_structure=storey1)
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# And referenced in the others
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ifcopenshell.api.run("spatial.reference_structure", model, product=column, relating_structure=storey2)
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ifcopenshell.api.run("spatial.reference_structure", model, product=column, relating_structure=storey3)
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"""
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self.file = file
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self.settings = {
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"product": None,
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"relating_structure": None,
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"product": product,
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"relating_structure": relating_structure,
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}
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for key, value in settings.items():
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self.settings[key] = value
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def execute(self):
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referenced_in_structures = self.settings["product"].ReferencedInStructures
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@@ -21,7 +21,39 @@ import ifcopenshell.api
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class Usecase:
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def __init__(self, file, **settings):
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def __init__(self, file, product=None):
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"""Unassigns a container from a product.
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Caution: this API function may be replaced by spatial.unassign_container
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:param product: The IfcProduct to remove the containment from.
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:type product: ifcopenshell.entity_instance.entity_instance
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:return: None
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:rtype: None
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Example::
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project = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcProject")
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site = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcSite")
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building = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuilding")
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storey = ifcopenshell.api.run("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.run("aggregate.assign_object", model, product=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.run("aggregate.assign_object", model, product=building, relating_object=site)
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ifcopenshell.api.run("aggregate.assign_object", model, product=storey, relating_object=building)
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# Create a wall
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wall = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcWall")
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# The wall is in the storey
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ifcopenshell.api.run("spatial.assign_container", model, product=wall, relating_structure=storey)
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# Not anymore!
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ifcopenshell.api.run("spatial.remove_container", model, product=wall)
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"""
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self.file = file
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self.settings = {"product": None}
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for key, value in settings.items():
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@@ -21,13 +21,41 @@ import ifcopenshell.api
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class Usecase:
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def __init__(self, file, **settings):
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def __init__(self, file, product=None):
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"""Unassigns a container from a product.
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:param product: The IfcProduct to remove the containment from.
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:type product: ifcopenshell.entity_instance.entity_instance
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:return: None
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:rtype: None
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Example::
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project = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcProject")
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site = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcSite")
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building = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuilding")
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storey = ifcopenshell.api.run("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.run("aggregate.assign_object", model, product=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.run("aggregate.assign_object", model, product=building, relating_object=site)
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ifcopenshell.api.run("aggregate.assign_object", model, product=storey, relating_object=building)
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# Create a wall
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wall = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcWall")
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# The wall is in the storey
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ifcopenshell.api.run("spatial.assign_container", model, product=wall, relating_structure=storey)
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# Not anymore!
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ifcopenshell.api.run("spatial.unassign_container", model, product=wall)
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"""
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self.file = file
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self.settings = {
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"product": None,
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"product": product,
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}
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for key, value in settings.items():
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self.settings[key] = value
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def execute(self):
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for rel in self.settings["product"].ContainedInStructure or []:
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