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brep2ifc.py
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brep2ifc.py
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# BlenderBIM Add-on - OpenBIM Blender Add-on
# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
# Copyright (C) 2023 Bernd Hahnebach <bernd@bimstatik.org>
# This file is part of BlenderBIM Add-on.
#
# BlenderBIM Add-on is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# BlenderBIM Add-on 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with BlenderBIM Add-on. If not, see <http://www.gnu.org/licenses/>.
# based on https://github.com/IfcOpenShell/IfcOpenShell/blob/v0.7.0/src/blenderbim/scripts/obj2ifc.py#
# This can be packaged with `pyinstaller --onefile --hidden-import numpy --collect-all ifcopenshell --clean brep2ifc.py`
import argparse
import ifcopenshell
import ifcopenshell.api
import ifcopenshell.api.owner.settings
from pathlib import Path
from ifcopenshell import geom
import numpy as np
class Brep2Ifc:
def __init__(self, paths, outfile):
self.paths = paths
self.outfile = outfile
self.basename = Path(outfile).stem
def execute(self, version="IFC4"):
self.create_ifc_file(version)
for path in self.paths:
self.path = path
self._execute()
def _execute(self):
abrep_file = open(self.paths, "r")
brep_geom = abrep_file.read()
abrep_file.close()
representation = geom.serialise("IFC4", brep_geom)
product = self.file.create_entity(
"IfcBuildingElementProxy",
GlobalId=ifcopenshell.guid.new(),
Name=self.basename,
Representation=representation,
)
ifcopenshell.api.run("spatial.assign_container", self.file, product=product, relating_structure=self.storey)
product.ObjectPlacement = self.placement
self.file.write(self.outfile)
def create_ifc_file(self, version):
self.file = ifcopenshell.api.run("project.create_file", version=version)
person = ifcopenshell.api.run("owner.add_person", self.file)
person[0] = person.GivenName = None
person.FamilyName = "user"
org = ifcopenshell.api.run("owner.add_organisation", self.file)
org[0] = None
org.Name = "template"
user = ifcopenshell.api.run("owner.add_person_and_organisation", self.file, person=person, organisation=org)
application = ifcopenshell.api.run("owner.add_application", self.file)
ifcopenshell.api.owner.settings.get_user = lambda ifc: user
ifcopenshell.api.owner.settings.get_application = lambda ifc: application
project = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcProject", name=self.basename)
lengthunit = ifcopenshell.api.run("unit.add_si_unit", self.file, unit_type="LENGTHUNIT")
ifcopenshell.api.run("unit.assign_unit", self.file, units=[lengthunit])
model = ifcopenshell.api.run("context.add_context", self.file, context_type="Model")
self.context = ifcopenshell.api.run(
"context.add_context",
self.file,
context_type="Model",
context_identifier="Body",
target_view="MODEL_VIEW",
parent=model,
)
site = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcSite", name="My Site")
building = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcBuilding", name="My Building")
self.storey = ifcopenshell.api.run(
"root.create_entity", self.file, ifc_class="IfcBuildingStorey", name="My Storey"
)
ifcopenshell.api.run("aggregate.assign_object", self.file, product=site, relating_object=project)
ifcopenshell.api.run("aggregate.assign_object", self.file, product=building, relating_object=site)
ifcopenshell.api.run("aggregate.assign_object", self.file, product=self.storey, relating_object=building)
ifcopenshell.api.run("geometry.edit_object_placement", self.file, product=site)
ifcopenshell.api.run("geometry.edit_object_placement", self.file, product=building)
ifcopenshell.api.run("geometry.edit_object_placement", self.file, product=self.storey)
self.origin = self.file.createIfcAxis2Placement3D(
self.file.createIfcCartesianPoint((0.0, 0.0, 0.0)),
self.file.createIfcDirection((0.0, 0.0, 1.0)),
self.file.createIfcDirection((1.0, 0.0, 0.0)),
)
self.placement = self.file.createIfcLocalPlacement(self.storey.ObjectPlacement, self.origin)
self.history = ifcopenshell.api.run("owner.create_owner_history", self.file)
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Converts an OBJ to an IFC")
parser.add_argument("obj", type=str, nargs="+", help="One or more OBJ files")
parser.add_argument("-o", "--output", type=str, help="The output file to save the patched IFC", default="out.ifc")
args = parser.parse_args()
brep2ifc = Brep2Ifc(args.obj, args.output)
brep2ifc.execute()