add some general method create_ifc

B by bernd on 14 Apr 2023, edited 19 Apr 2023 #

In a lot of cases I need some ifcfile framework add some product with geometry add it to the spatial structure and write the ifc.

AFAIK there is not ifcfile framework ready to use. For creating nurbs ifc out of a brep I used this script https://github.com/IfcOpenShell/IfcOpenShell/blob/v0.7.0/src/blenderbim/scripts/obj2ifc.py no changes where made to create_ifc_file() My version can be found here: https://github.com/berndhahnebach/IfcOpenShell/blob/03962eb58c3b9e561b4a21d5b7b18675b42d3e05/src/blenderbim/scripts/brep2ifc.py

This file https://github.com/berndhahnebach/IfcOpenShell/blob/brep2ifc/src/blenderbim/scripts/dxf2ifc.py has a similar method create_ifc_file() as well.

How about adding some general method create_ifc_file() which is ready to add products too? For scripting this would be very handy to import such a method from ifcopenshell.

I would even help with this, but have no idea where to put this.

cheers bernd

M by Moult on 14 Apr 2023 #

Doesn't this already exist? See ifcopenshell.template?

B by bernd on 14 Apr 2023 #

how do I use this?

M by Moult on 14 Apr 2023 #

ifcopenshell.template.create(...)

B by bernd on 14 Apr 2023, edited 14 Apr 2023 #

Has this been added recently?

>>> 

>>> import ifcopenshell

>>> ifcopenshell.template

Traceback (most recent call last):

  File "<input>", line 1, in <module>

AttributeError: module 'ifcopenshell' has no attribute 'template'. Did you mean: 'tempfile'?

>>>

I need to update IfcOpenShell ...

M by Moult on 14 Apr 2023 # +1 votes

It's been there for a while now.


>>> import ifcopenshell

>>> import ifcopenshell.template

>>> ifcopenshell.template.create(

create( filename=None, timestring=None, organization=None, creator=None, schema_identifier=None, application_version=None, timestamp=None, application=None, project_globalid=None, project_name=None, )

>>> ifcopenshell.template.create()

<ifcopenshell.file.file object at 0x7f0a721329b0>

B by bernd on 14 Apr 2023 #

ok my fault ... seams exactly what I need ... :-)

import ifcopenshell

import ifcopenshell.template

help(ifcopenshell.template.create)

ifcopenshell.template.create()




>>> 

>>> import ifcopenshell

>>> import ifcopenshell.template

>>> help(ifcopenshell.template.create)

Help on function create in module ifcopenshell.template:



create(filename=None, timestring=None, organization=None, creator=None, schema_identifier=None, application_version=None, timestamp=None, application=None, project_globalid=None, project_name=None)



>>> ifcopenshell.template.create()

<ifcopenshell.file.file object at 0x000001D93BE2C700>

>>>

B by bernd on 14 Apr 2023, edited 14 Apr 2023 # +1 votes

This is what has worked for me. Any review, comments and suggestions will be greatly appreciated.

import ifcopenshell

import ifcopenshell.api

import ifcopenshell.geom

import ifcopenshell.template



# create base ifcfile

# help(ifcopenshell.template.create)

ifcfile=ifcopenshell.template.create()





# spatial structure

project = ifcfile.by_type("IfcProject")[0]

site = ifcopenshell.api.run("root.create_entity", ifcfile, ifc_class="IfcSite", name="My Site")

building = ifcopenshell.api.run("root.create_entity", ifcfile, ifc_class="IfcBuilding", name="My Building")

storey = ifcopenshell.api.run(

    "root.create_entity", ifcfile, ifc_class="IfcBuildingStorey", name="My Storey"

)

ifcopenshell.api.run("aggregate.assign_object", ifcfile, product=site, relating_object=project)

ifcopenshell.api.run("aggregate.assign_object", ifcfile, product=building, relating_object=site)

ifcopenshell.api.run("aggregate.assign_object", ifcfile, product=storey, relating_object=building)

ifcopenshell.api.run("geometry.edit_object_placement", ifcfile, product=site)

ifcopenshell.api.run("geometry.edit_object_placement", ifcfile, product=building)

ifcopenshell.api.run("geometry.edit_object_placement", ifcfile, product=storey)





# miscellaneous

origin = ifcfile.createIfcAxis2Placement3D(

    ifcfile.createIfcCartesianPoint((0.0, 0.0, 0.0)),

    ifcfile.createIfcDirection((0.0, 0.0, 1.0)),

    ifcfile.createIfcDirection((1.0, 0.0, 0.0)),

)

placement = ifcfile.createIfcLocalPlacement(storey.ObjectPlacement, origin)

history = ifcopenshell.api.run("owner.create_owner_history", ifcfile)





# get the geometry

abrep_file = open("C:/Users/BHA/Desktop/some_geom_scaled.brep", "r")

brep_data = abrep_file.read()

abrep_file.close()

proddefshape = ifcopenshell.geom.serialise("IFC4", brep_data)





# add product

product = ifcfile.create_entity(

    "IfcBuildingElementProxy",

    GlobalId=ifcopenshell.guid.new(),

    Name="My Building Element",

    Representation=proddefshape,

)

ifcopenshell.api.run(

    "spatial.assign_container",

    ifcfile,

    product=product,

    relating_structure=ifcfile.by_type("IfcBuildingStorey")[0]

)

product.ObjectPlacement = placement





# write

ifcfile.write("C:/Users/BHA/Desktop/mycy2.ifc")

B by bernd on 14 Apr 2023, edited 14 Apr 2023 #

How about a method to create a minimalisc spatial strucutre in a existing ifcfile object which has no spatial structure?

Or is it like many cases for me ... there is something in IfcOS already, but I just do not know about ...

M by Moult on 14 Apr 2023 #

@bernd sure, I think it's a great idea to add that to ifcopenshell.template (not as part of the create function, but as a separate create_spatial_structure function perhaps).

B by bernd on 14 Apr 2023 #

For sure it has to be a separate method and not a template option. This is useful for exist files as well.

where in ifcos should such method be added?

M by Moult on 14 Apr 2023 #

In the ifcopenshell.template module, I would imagine.

A by aothms on 19 Apr 2023 #

ifcopenshell.template was added before the HL API was provided. I think it maybe also make sense to better integrate them. Maybe both (empty template and basic spatial structure) should be API calls instead. But regardless of which approach, any effort towards making basic setup less tedious is very helpful.

OSArch Community

add some general method create_ifc_file()