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convert_geo.py
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convert_geo.py
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# The script revised is based on the following repo
# https://github.com/MGVisschers/IFC-to-gbXML-converter
# Import necessary python libraries e.g. IfcOpenShell, PythonOCC and MiniDom
import ifcopenshell.geom
import ifcopenshell.util.unit
import OCC.Core.BRep
import OCC.Core.TopExp
import OCC.Core.TopoDS
import OCC.Core.TopAbs
import OCC.Core.ProjLib
import OCC.Core.BRepTools
import datetime
import time
from xml.dom import minidom
# Use IfcOpenShell and OPENCASCADE to convert implicit geometry into explicit geometry
# Each Face consists of Wires, which consists of Edges, which has Vertices
FACE, WIRE, EDGE, VERTEX = OCC.Core.TopAbs.TopAbs_FACE, OCC.Core.TopAbs.TopAbs_WIRE, OCC.Core.TopAbs.TopAbs_EDGE, \
OCC.Core.TopAbs.TopAbs_VERTEX
settings = ifcopenshell.geom.settings()
settings.set(settings.USE_PYTHON_OPENCASCADE, True)
def sub(shape, ty):
F = {
OCC.Core.TopAbs.TopAbs_FACE: OCC.Core.TopoDS.topods_Face,
OCC.Core.TopAbs.TopAbs_WIRE: OCC.Core.TopoDS.topods_Wire,
OCC.Core.TopAbs.TopAbs_EDGE: OCC.Core.TopoDS.topods_Edge,
OCC.Core.TopAbs.TopAbs_VERTEX: OCC.Core.TopoDS.topods_Vertex,
}[ty]
exp = OCC.Core.TopExp.TopExp_Explorer(shape, ty)
while exp.More():
face = F(exp.Current())
yield face
exp.Next()
def ring(wire, face):
def vertices():
exp = OCC.Core.BRepTools.BRepTools_WireExplorer(wire, face)
while exp.More():
yield exp.CurrentVertex()
exp.Next()
# LIQUIDSO
# yield exp.CurrentVertex()
return list(map(lambda p: (p.X(), p.Y(), p.Z()), map(OCC.Core.BRep.BRep_Tool.Pnt, vertices())))
# Face to vertices
def get_vertices(shape):
for face in sub(shape, FACE):
for idx, wire in enumerate(sub(face, WIRE)):
vertices = ring(wire, face)
if idx > 0:
vertices.reverse()
return vertices
# Align the gbXML input according to the predefined official gbXML schema
def fix_xml_cmps(a):
return 'campus' + a.replace('$', '').replace(':', '').replace(' ', '').replace('(', '').replace(')', '')
def fix_xml_bldng(a):
return 'building' + a.replace('$', '').replace(':', '').replace(' ', '').replace('(', '').replace(')', '')
def fix_xml_stry(a):
return 'storey' + a.replace('$', '').replace(':', '').replace(' ', '').replace('(', '').replace(')', '')
def fix_xml_spc(a):
return 'space' + a.replace('$', '').replace(':', '').replace(' ', '').replace('(', '').replace(')', '')
def fix_xml_id(a):
return 'id' + a.replace('$', '').replace(':', '').replace(' ', '').replace('(', '').replace(')', '')
def fix_xml_name(a):
return 'object' + a.replace('$', '').replace(':', '').replace(' ', '').replace('(', '').replace(')', '')
def fix_xml_cons(a):
return 'construct' + a.replace('$', '').replace(':', '').replace(' ', '').replace('(', '').replace(')', '')
def fix_xml_layer(a):
return 'lyr' + a.replace('$', '').replace(':', '').replace(' ', '').replace('(', '').replace(')', '')
# Access the specific IFC file; external directory: (r"C:/Users/s136146/Desktop/StoreysWindowsMaterialsFacade.ifc")
ifc_file = ifcopenshell.open('cases/proj2/proj2.ifc')
# LIQUIDSO
unit_scale = ifcopenshell.util.unit.calculate_unit_scale(ifc_file)
# Create the XML root by making use of MiniDom
root = minidom.Document()
# Create the 'gbXML' element and append it to the Root of the document
gbxml = root.createElement('gbXML')
root.appendChild(gbxml)
# Create attributes for the 'gbXML' element
gbxml.setAttribute('xmlns', 'http://www.gbxml.org/schema')
gbxml.setAttribute('temperatureUnit', 'C')
gbxml.setAttribute('lengthUnit', 'Meters')
gbxml.setAttribute('areaUnit', 'SquareMeters')
gbxml.setAttribute('volumeUnit', 'CubicMeters')
gbxml.setAttribute('useSIUnitsForResults', 'true')
gbxml.setAttribute('version', '0.37')
# Create a dictionary to store all gbXML element Id's
dict_id = {}
# Specify the 'Campus' element of the gbXML schema; making use of IFC entity 'IfcSite'
# This element is added as child to the earlier created 'gbXML' element
site = ifc_file.by_type('IfcSite')
for element in site:
campus = root.createElement('Campus')
campus.setAttribute('id', fix_xml_cmps(element.GlobalId))
gbxml.appendChild(campus)
dict_id[fix_xml_cmps(element.GlobalId)] = campus
# Specify the 'Location' element of the gbXML schema; making use of IFC entities 'IfcSite' and 'IfcPostalAddress'
# This new element is added as child to the earlier created 'Campus' element
location = root.createElement('Location')
campus.appendChild(location)
longitude = root.createElement('Longitude')
longitudeValue = str(element.RefLongitude[0])
longitude.appendChild(root.createTextNode(longitudeValue))
location.appendChild(longitude)
latitude = root.createElement('Latitude')
latitudeValue = str(element.RefLatitude[0])
latitude.appendChild(root.createTextNode(latitudeValue))
location.appendChild(latitude)
elevation = root.createElement('Elevation')
# LIQUIDSO
elevation.appendChild(root.createTextNode(str(element.RefElevation * unit_scale)))
location.appendChild(elevation)
address = ifc_file.by_type('IfcPostalAddress')
for element in address:
zipcode = root.createElement('ZipcodeOrPostalCode')
zipcode.appendChild(root.createTextNode(element.PostalCode))
location.appendChild(zipcode)
name = root.createElement('Name')
name.appendChild(root.createTextNode(element.Region + ', ' + element.Country))
location.appendChild(name)
# Specify the 'Building' element of the gbXML schema; making use of IFC entity 'IfcBuilding'
# This new element is added as child to the earlier created 'Campus' element
buildings = ifc_file.by_type('IfcBuilding')
for element in buildings:
building = root.createElement('Building')
building.setAttribute('id', fix_xml_bldng(element.GlobalId))
building.setAttribute('buildingType', "Unknown")
campus.appendChild(building)
dict_id[fix_xml_bldng(element.GlobalId)] = building
for element in address:
streetAddress = root.createElement('StreetAddress')
streetAddress.appendChild(root.createTextNode(element.Region + ', ' + element.Country))
building.appendChild(streetAddress)
# Specify the 'BuildingStorey' element of the gbXML schema; making use of IFC entity 'IfcBuildingStorey'
# This new element is added as child to the earlier created 'Building' element
storeys = ifc_file.by_type('IfcBuildingStorey')
storey_name = 1
for element in storeys:
buildingStorey = root.createElement('BuildingStorey')
buildingStorey.setAttribute('id', fix_xml_stry(element.GlobalId))
building.appendChild(buildingStorey)
dict_id[fix_xml_stry(element.GlobalId)] = buildingStorey
name = root.createElement('Name')
name.appendChild(root.createTextNode('Storey_%d' % storey_name))
storey_name = storey_name + 1
buildingStorey.appendChild(name)
level = root.createElement('Level')
# LIQUIDSO
level.appendChild(root.createTextNode(str(element.Elevation * unit_scale)))
buildingStorey.appendChild(level)
# Specify the 'Space' element of the gbXML schema; making use of IFC entity 'IfcSpace'
# This new element is added as child to the earlier created 'Building' element
spaces = ifc_file.by_type('IfcSpace')
space_name = 1
for s in spaces:
space = root.createElement('Space')
space.setAttribute('id', fix_xml_spc(s.GlobalId))
building.appendChild(space)
dict_id[fix_xml_spc(s.GlobalId)] = space
# Refer to the relating 'BuildingStorey' GUID by iterating through IFC entities
space.setAttribute('buildingStoreyIdRef', fix_xml_stry(s.Decomposes[0].RelatingObject.GlobalId))
area = root.createElement('Area')
volume = root.createElement('Volume')
properties = s.IsDefinedBy
for r in properties:
if r.is_a('IfcRelDefinesByProperties'):
if r.RelatingPropertyDefinition.is_a('IfcPropertySet'):
for p in r.RelatingPropertyDefinition.HasProperties:
if p.Name == 'Area':
valueArea = p.NominalValue.wrappedValue
area.appendChild(root.createTextNode(str(valueArea)))
space.appendChild(area)
if p.Name == 'Volume':
valueVolume = p.NominalValue.wrappedValue
volume.appendChild(root.createTextNode(str(valueVolume)))
space.appendChild(volume)
name = root.createElement('Name')
name.appendChild(root.createTextNode('Space_%d' % space_name))
space_name = space_name + 1
space.appendChild(name)
# Specify the 'SpaceBoundary' element of the gbXML schema; making use of IFC entity 'IfcSpace'
# This new element is added as child to the earlier created 'Space' element
boundaries = s.BoundedBy
for element in boundaries:
# Make sure a 'SpaceBoundary' is representing an actual element
if element.RelatedBuildingElement == None:
continue
# Specify the 'IfcCurveBoundedPlane' entity which represents the geometry
boundaryGeom = element.ConnectionGeometry.SurfaceOnRelatingElement
if boundaryGeom.is_a('IfcCurveBoundedPlane') and boundaryGeom.InnerBoundaries is None:
boundaryGeom.InnerBoundaries = ()
print(boundaryGeom)
# Use IfcOpenShell and OPENCASCADE to attach geometry to the specified IFC entity
space_boundary_shape = ifcopenshell.geom.create_shape(settings, boundaryGeom)
# Create 'SpaceBoundary' elements for the following building elements
if element.RelatedBuildingElement.is_a('IfcCovering') or element.RelatedBuildingElement.is_a('IfcSlab') or \
element.RelatedBuildingElement.is_a('IfcWall') or element.RelatedBuildingElement.is_a('IfcRoof'):
spaceBoundary = root.createElement('SpaceBoundary')
spaceBoundary.setAttribute('isSecondLevelBoundary', "true")
# Refer to the relating 'SpaceBoundary' GUID by iterating through IFC entities
spaceBoundary.setAttribute('surfaceIdRef', fix_xml_id(element.GlobalId))
space.appendChild(spaceBoundary)
planarGeometry = root.createElement('PlanarGeometry')
spaceBoundary.appendChild(planarGeometry)
# Specify the 'PolyLoop' element which contains 4 'CartesianPoint' elements with each
# 3 explicit 'Coordinate' elements. Note: if geometry is not attached to the 'SpaceBoundary' element, the
# relationship between 'Space' and 'Building' elements is handled only on a logical level. If geometry is
# attached, it is given within the local coordinate systems of the 'Space' and (if given in addition) of the
# 'Building' element.
# Z-coordinates are extracted by iterating through IFC entities to the 'IfcCartesianPoint' of the
# related 'IfcBuildingStorey'
print('SpaceBoundary')
new_z = element.RelatingSpace.ObjectPlacement.PlacementRelTo.RelativePlacement.Location.Coordinates[2]
# LIQUIDSO
new_z = new_z * unit_scale
polyLoop = root.createElement('PolyLoop')
for v in get_vertices(space_boundary_shape):
x, y, z = v
z = z + new_z
print(x, y, z)
point = root.createElement('CartesianPoint')
for c in x, y, z:
coord = root.createElement('Coordinate')
coord.appendChild(root.createTextNode(str(c)))
point.appendChild(coord)
polyLoop.appendChild(point)
planarGeometry.appendChild(polyLoop)
# Specify the 'Surface' element of the gbXML schema; making use of IFC entity 'IfcRelSpaceBoundary'
# This new element is added as child to the earlier created 'Campus' element
boundaries = ifc_file.by_type('IfcRelSpaceBoundary')
opening_id = 1
for element in boundaries:
# Make sure a 'SpaceBoundary' is representing an actual element
if element.RelatedBuildingElement == None:
continue
# Specify the 'IfcCurveBoundedPlane' entity which represents the geometry
if element.ConnectionGeometry.SurfaceOnRelatingElement == None:
continue
surfaceGeom = element.ConnectionGeometry.SurfaceOnRelatingElement
if surfaceGeom.is_a('IfcCurveBoundedPlane') and surfaceGeom.InnerBoundaries is None:
surfaceGeom.InnerBoundaries = ()
print(surfaceGeom)
space_boundary_shape = ifcopenshell.geom.create_shape(settings, surfaceGeom)
# Specify each 'Surface' element and set 'SurfaceType' attributes
if element.RelatedBuildingElement.is_a('IfcCovering') or element.RelatedBuildingElement.is_a('IfcSlab') or element.\
RelatedBuildingElement.is_a('IfcWall') or element.RelatedBuildingElement.is_a('IfcRoof'):
surface = root.createElement('Surface')
surface.setAttribute('id', fix_xml_id(element.GlobalId))
dict_id[fix_xml_id(element.GlobalId)] = surface
if element.RelatedBuildingElement.is_a('IfcCovering'):
surface.setAttribute('surfaceType', 'Ceiling')
if element.RelatedBuildingElement.is_a('IfcSlab'):
surface.setAttribute('surfaceType', 'InteriorFloor')
if element.RelatedBuildingElement.is_a('IfcWall') and element.\
InternalOrExternalBoundary == 'EXTERNAL':
surface.setAttribute('surfaceType', 'ExteriorWall')
if element.RelatedBuildingElement.is_a('IfcWall') and element.\
InternalOrExternalBoundary == 'INTERNAL':
surface.setAttribute('surfaceType', 'InteriorWall')
if element.RelatedBuildingElement.is_a('IfcRoof'):
surface.setAttribute('surfaceType', 'Roof')
# Refer to the relating 'IfcRelAssociatesMaterial' GUID by iterating through IFC entities
surface.setAttribute('constructionIdRef', fix_xml_cons(element.RelatedBuildingElement.
HasAssociations[0].GlobalId))
name = root.createElement('Name')
name.appendChild(root.createTextNode(fix_xml_name(element.GlobalId)))
surface.appendChild(name)
adjacentSpaceId = root.createElement('AdjacentSpaceId')
# Refer to the relating 'Space' GUID by iterating through IFC entities
adjacentSpaceId.setAttribute('spaceIdRef', fix_xml_spc(element.RelatingSpace.GlobalId))
surface.appendChild(adjacentSpaceId)
planarGeometry = root.createElement('PlanarGeometry')
surface.appendChild(planarGeometry)
# Specify the 'PolyLoop' element which contains 4 'CartesianPoint' elements with each
# 3 explicit 'Coordinate' elements. Note: if geometry is not attached to the 'SpaceBoundary' element, the
# relationship between 'Space' and 'Building' elements is handled only on a logical level. If geometry is
# attached, it is given within the local coordinate systems of the 'Space' and (if given in addition) of the
# 'Building' element.
# Z-coordinates are extracted by iterating through IFC entities to the 'IfcCartesianPoint' of the
# related 'IfcBuildingStorey'
print("Surface")
new_z = element.RelatingSpace.ObjectPlacement.PlacementRelTo.RelativePlacement.Location.Coordinates[2]
# LIQUIDSO
new_z = new_z * unit_scale
polyLoop = root.createElement('PolyLoop')
for v in get_vertices(space_boundary_shape):
x, y, z = v
z = z + new_z
print(x, y, z)
point = root.createElement('CartesianPoint')
for c in x, y, z:
coord = root.createElement('Coordinate')
coord.appendChild(root.createTextNode(str(c)))
point.appendChild(coord)
polyLoop.appendChild(point)
planarGeometry.appendChild(polyLoop)
objectId = root.createElement('CADObjectId')
objectId.appendChild(root.createTextNode(fix_xml_name(element.GlobalId)))
surface.appendChild(objectId)
campus.appendChild(surface)
if element.RelatedBuildingElement.is_a('IfcWindow'):
opening = root.createElement('Opening')
# Refer to the relating 'IfcWindow' GUID by iterating through IFC entities
opening.setAttribute('windowTypeIdRef', fix_xml_id(element.RelatedBuildingElement.GlobalId))
opening.setAttribute('openingType', 'OperableWindow')
opening.setAttribute('id', 'Opening%d' % opening_id)
opening_id = opening_id + 1
# If the building element is an 'IfcWindow' the gbXML element 'Opening' is added
print('Opening')
planarGeometry = root.createElement('PlanarGeometry')
opening.appendChild(planarGeometry)
# Specify the 'PolyLoop' element which contains 4 'CartesianPoint' elements with each
# 3 explicit 'Coordinate' elements. Note: if geometry is not attached to the 'SpaceBoundary' element, the
# relationship between 'Space' and 'Building' elements is handled only on a logical level. If geometry is
# attached, it is given within the local coordinate systems of the 'Space' and (if given in addition) of the
# 'Building' element.
# Z-coordinates are extracted by iterating through IFC entities to the 'IfcCartesianPoint' of the
# related 'IfcBuildingStorey'
polyLoop = root.createElement('PolyLoop')
new_z = element.RelatingSpace.ObjectPlacement.PlacementRelTo.RelativePlacement.Location.Coordinates[2]
# LIQUIDSO
new_z = new_z * unit_scale
for v in get_vertices(space_boundary_shape):
x, y, z = v
z = z + new_z
print(x, y, z)
point = root.createElement('CartesianPoint')
for c in x, y, z:
coord = root.createElement('Coordinate')
coord.appendChild(root.createTextNode(str(c)))
point.appendChild(coord)
polyLoop.appendChild(point)
planarGeometry.appendChild(polyLoop)
name = root.createElement('Name')
name.appendChild(root.createTextNode(fix_xml_name(element.RelatedBuildingElement.Name)))
opening.appendChild(name)
objectId = root.createElement('CADObjectId')
objectId.appendChild(root.createTextNode(fix_xml_name(element.RelatedBuildingElement.Name)))
opening.appendChild(objectId)
surface.appendChild(opening)
else:
continue
# Specify the 'WindowType' element of the gbXML schema; making use of IFC entity 'IfcWindow'
# This new element is added as child to the earlier created 'gbXML' element
windows = ifc_file.by_type('IfcWindow')
for element in windows:
window = root.createElement('WindowType')
window.setAttribute('id', fix_xml_id(element.GlobalId))
gbxml.appendChild(window)
dict_id[fix_xml_id(element.GlobalId)] = window
name = root.createElement('Name')
name.appendChild(root.createTextNode(fix_xml_name(element.Name)))
window.appendChild(name)
description = root.createElement('Description')
description.appendChild(root.createTextNode(fix_xml_name(element.Name)))
window.appendChild(description)
# Specify analytical properties of the 'IfcWindow' by iterating through IFC entities
analyticValue = element.IsDefinedBy
u_value = root.createElement('U-value')
for r in analyticValue:
if r.is_a("IfcRelDefinesByProperties"):
if r.RelatingPropertyDefinition.is_a('IfcPropertySet'):
for p in r.RelatingPropertyDefinition.HasProperties:
if p.Name == 'ThermalTransmittance':
valueU = p.NominalValue.wrappedValue
u_value.setAttribute('unit', 'WPerSquareMeterK')
u_value.appendChild(root.createTextNode(str(valueU)))
window.appendChild(u_value)
solarHeat = root.createElement('SolarHeatGainCoeff')
visualLight = root.createElement('Transmittance')
for r in analyticValue:
if r.is_a('IfcRelDefinesByType'):
if r.RelatingType.is_a('IfcWindowStyle'):
for p in r.RelatingType.HasPropertySets:
if p.Name == 'Analytical Properties(Type)':
for t in p.HasProperties:
if t.Name == 'Solar Heat Gain Coefficient':
valueSolar = t.NominalValue.wrappedValue
solarHeat.setAttribute('unit', 'Fraction')
solarHeat.appendChild(root.createTextNode(str(valueSolar)))
window.appendChild(solarHeat)
if t.Name == 'Visual Light Transmittance':
valueLight = t.NominalValue.wrappedValue
visualLight.setAttribute('unit', 'Fraction')
visualLight.setAttribute('type', 'Visible')
visualLight.appendChild(root.createTextNode(str(valueLight)))
window.appendChild(visualLight)
# Specify the 'Construction' element of the gbXML schema; making use of IFC entity 'IfcRelSpaceBoundary'
# This new element is added as child to the earlier created 'gbXML' element
listCon = []
for element in boundaries:
# Make sure a 'SpaceBoundary' is representing an actual element
if element.RelatedBuildingElement is None:
continue
if element.RelatedBuildingElement.is_a('IfcCovering') or element.RelatedBuildingElement.is_a('IfcSlab') or element.\
RelatedBuildingElement.is_a('IfcWall') or element.RelatedBuildingElement.is_a('IfcRoof'):
# Refer to the relating 'IfcRelAssociatesMaterial' GUID by iterating through IFC entities
constructions = element.RelatedBuildingElement.HasAssociations[0].GlobalId
# Make use of a list to make sure no same 'Construction' elements are added twice
if constructions not in listCon:
listCon.append(constructions)
construction = root.createElement('Construction')
construction.setAttribute('id', fix_xml_cons(element.RelatedBuildingElement.HasAssociations[0].GlobalId))
dict_id[fix_xml_cons(element.RelatedBuildingElement.HasAssociations[0].GlobalId)] = construction
# Specify analytical properties of the 'Construction' element by iterating through IFC entities
analyticValue = element.RelatedBuildingElement.IsDefinedBy
u_value = root.createElement('U-value')
for r in analyticValue:
if r.is_a('IfcRelDefinesByProperties'):
if r.RelatingPropertyDefinition.is_a('IfcPropertySet'):
for p in r.RelatingPropertyDefinition.HasProperties:
if element.RelatedBuildingElement.is_a("IfcWall"):
if p.Name == 'ThermalTransmittance':
valueU = p.NominalValue.wrappedValue
u_value.setAttribute('unit', 'WPerSquareMeterK')
u_value.appendChild(root.createTextNode(str(valueU)))
construction.appendChild(u_value)
if p.Name == 'Heat Transfer Coefficient (U)':
valueU = p.NominalValue.wrappedValue
u_value.setAttribute('unit', 'WPerSquareMeterK')
u_value.appendChild(root.createTextNode(str(valueU)))
construction.appendChild(u_value)
absorptance = root.createElement('Absorptance')
for r in analyticValue:
if r.is_a('IfcRelDefinesByProperties'):
if r.RelatingPropertyDefinition.is_a('IfcPropertySet'):
for p in r.RelatingPropertyDefinition.HasProperties:
if p.Name == 'Absorptance':
valueAb = p.NominalValue.wrappedValue
absorptance.setAttribute('unit', 'Fraction')
absorptance.setAttribute('type', 'ExtIR')
absorptance.appendChild(root.createTextNode(str(valueAb)))
construction.appendChild(absorptance)
# Refer to the relating 'IfcRelAssociatesMaterial' GUID by iterating through IFC entities
layerId = fix_xml_layer(element.RelatedBuildingElement.HasAssociations[0].GlobalId)
layer_id = root.createElement('LayerId')
layer_id.setAttribute('layerIdRef', layerId)
construction.appendChild(layer_id)
# Refer to the relating 'IfcMaterialLayerSet' name by iterating through IFC entities
name = root.createElement('Name')
if hasattr(element.RelatedBuildingElement.HasAssociations[0].RelatingMaterial, "ForLayerSet"):
name.appendChild(root.createTextNode(element.RelatedBuildingElement.HasAssociations[0].
RelatingMaterial.ForLayerSet.LayerSetName))
else:
name.appendChild(root.createTextNode(""))
construction.appendChild(name)
gbxml.appendChild(construction)
else:
continue
# Specify the 'Layer' element of the gbXML schema; making use of IFC entity 'IfcBuildingElement'
# This new element is added as child to the earlier created 'gbXML' element
buildingElements = ifc_file.by_type('IfcBuildingElement')
for element in buildingElements:
if element.is_a('IfcWall') or element.is_a('IfcCovering') or element.is_a('IfcSlab') or element.is_a('IfcRoof'):
# Try and catch an Element that is just an Aggregate
if element.IsDecomposedBy:
continue
# Refer to the relating 'IfcRelAssociatesMaterial' GUID by iterating through IFC entities
layerId = fix_xml_layer(element.HasAssociations[0].GlobalId)
layer = root.createElement('Layer')
layer.setAttribute('id', layerId)
dict_id[layerId] = layer
# Specify the 'IfcMaterialLayer' entity and iterate to each 'IfcMaterial' entity
if not element.HasAssociations[0].RelatingMaterial.is_a('IfcMaterialLayerSetUsage'):
continue
materials = element.HasAssociations[0].RelatingMaterial.ForLayerSet.MaterialLayers
for l in materials:
material_id = root.createElement('MaterialId')
material_id.setAttribute('materialIdRef', "mat_%d" % l.Material.id())
layer.appendChild(material_id)
dict_id["mat_%d" % l.Material.id()] = layer
gbxml.appendChild(layer)
else:
continue
# Specify the 'Material' element of the gbXML schema; making use of IFC entity 'IfcBuildingElement'
# This new element is added as child to the earlier created 'gbXML' element
listMat = []
for element in buildingElements:
if element.is_a('IfcWall') or element.is_a("IfcSlab") or element.is_a('IfcCovering') or element.is_a('IfcRoof'):
# Try and catch an Element that is just an Aggregate
if element.IsDecomposedBy:
continue
if not element.HasAssociations[0].RelatingMaterial.is_a('IfcMaterialLayerSetUsage'):
continue
materials = element.HasAssociations[0].RelatingMaterial.ForLayerSet.MaterialLayers
for l in materials:
item = l.Material.id()
# Make use of a list to make sure no same 'Materials' elements are added twice
if item not in listMat:
listMat.append(item)
material = root.createElement('Material')
material.setAttribute('id', "mat_%d" % l.Material.id())
dict_id["mat_%d" % l.Material.id()] = material
name = root.createElement('Name')
name.appendChild(root.createTextNode(l.Material.Name))
material.appendChild(name)
thickness = root.createElement('Thickness')
thickness.setAttribute('unit', 'Meters')
# LIQUIDSO
valueT = l.LayerThickness * unit_scale
thickness.appendChild(root.createTextNode((str(valueT))))
material.appendChild(thickness)
rValue = root.createElement('R-value')
rValue.setAttribute('unit', 'SquareMeterKPerW')
# Analytical properties of the Material entity can be found directly
# for material_property in l.Material.HasProperties:
# if material_property.Name == 'Pset_MaterialEnergy':
# for pset_material_energy in material_property.Properties:
# if pset_material_energy.Name == 'ThermalConductivityTemperatureDerivative':
# valueR = pset_material_energy.NominalValue.wrappedValue
# rValue.setAttribute('unit', 'SquareMeterKPerW')
# rValue.appendChild(root.createTextNode(str(valueR)))
# material.appendChild(rValue)
# gbxml.appendChild(material)
# Specify analytical properties of the 'Material' element by iterating through IFC entities
thermalResistance = element.IsDefinedBy
for r in thermalResistance:
if r.is_a('IfcRelDefinesByType'):
if r.RelatingType.is_a('IfcWallType'):
for p in r.RelatingType.HasPropertySets:
if p.Name == 'Analytical Properties(Type)':
for t in p.HasProperties:
if t.Name == 'Heat Transfer Coefficient (U)':
valueU = t.NominalValue.wrappedValue
valueR = valueT / valueU
rValue.appendChild(root.createTextNode(str(valueR)))
material.appendChild(rValue)
gbxml.appendChild(material)
if r.is_a('IfcRelDefinesByProperties'):
if r.RelatingPropertyDefinition.is_a('IfcPropertySet'):
for p in r.RelatingPropertyDefinition.HasProperties:
if p.Name == 'Heat Transfer Coefficient (U)':
valueU = p.NominalValue.wrappedValue
valueR = valueT / valueU
rValue.setAttribute('unit', 'SquareMeterKPerW')
rValue.appendChild(root.createTextNode(str(valueR)))
material.appendChild(rValue)
gbxml.appendChild(material)
if element.is_a('IfcCovering'):
if r.is_a('IfcRelDefinesByProperties'):
if r.RelatingType.is_a('IfcPropertySet'):
for p in r.RelatingType.HasPropertySets:
if p.Name == 'Analytical Properties(Type)':
for t in p.HasProperties:
if t.Name == 'Heat Transfer Coefficient (U)':
valueU = t.NominalValue.wrappedValue
valueR = valueT / valueU
rValue.setAttribute('unit', 'SquareMeterKPerW')
rValue.appendChild(root.createTextNode(str(valueR)))
material.appendChild(rValue)
gbxml.appendChild(material)
else:
continue
# Specify the 'DocumentHistory' element of the gbXML schema; making use of IFC entity 'IfcApplication' and 'IfcPerson'
# This new element is added as child to the earlier created 'gbXML' element
programInfo = ifc_file.by_type('IfcApplication')
docHistory = root.createElement('DocumentHistory')
for element in programInfo:
program = root.createElement('ProgramInfo')
program.setAttribute('id', element.ApplicationIdentifier)
docHistory.appendChild(program)
company = root.createElement('CompanyName')
company.appendChild(root.createTextNode(element.ApplicationDeveloper.Name))
program.appendChild(company)
product = root.createElement('ProductName')
product.appendChild(root.createTextNode(element.ApplicationFullName))
program.appendChild(product)
version = root.createElement('Version')
version.appendChild(root.createTextNode(element.Version))
program.appendChild(version)
personInfo = ifc_file.by_type('IfcPerson')
for element in personInfo:
created = root.createElement('CreatedBy')
created.setAttribute('personId', element.GivenName)
for element in programInfo:
created.setAttribute('programId', element.ApplicationIdentifier)
today = datetime.date.today()
created.setAttribute('date', today.strftime('%Y-%m-%dT') + time.strftime('%H:%M:%S'))
docHistory.appendChild(created)
for element in personInfo:
person = root.createElement('PersonInfo')
person.setAttribute('id', element.GivenName)
docHistory.appendChild(person)
gbxml.appendChild(docHistory)
# Create a new XML file and write all created elements to it
save_path_file = "output.xml"
root.writexml( open(save_path_file, "w"),
indent=" ",
addindent=" ",
newl='\n')