Creating a simple wall with property set and quantity information | IfcOpenShell Academy

[IfcOpenBot]

#Creating a simple wall with property set and quantity information | IfcOpenShell Academy

url

[IfcOpenBot]

Original comment by Omar zerhouni on 2021-01-04 08:12:44

---

Hi,

I am following the recipe, but getting an error in create_ifclocalplacement part.

Traceback (most recent call last):

File "C:/Users/TOSHIBA/AppData/Roaming/JetBrains/PyCharmCE2020.2/scratches/TestZone.py", line 103, in

site_placement = create_ifclocalplacement(ifcfile)

File "C:/Users/TOSHIBA/AppData/Roaming/JetBrains/PyCharmCE2020.2/scratches/TestZone.py", line 25, in create_ifclocalplacement

axis2placement = create_ifcaxis2placement(ifcfile, point, dir1, dir2)

File "C:/Users/TOSHIBA/AppData/Roaming/JetBrains/PyCharmCE2020.2/scratches/TestZone.py", line 17, in create_ifcaxis2placement

point = ifcfile.createIfcCartesianPoint(point)

File "C:\ProgramData\Anaconda3\envs\EnvPy36\lib\site-packages\ifcopenshell\file.py", line 83, in create_entity

self.wrapped_data.add(e.wrapped_data)

File "C:\ProgramData\Anaconda3\envs\EnvPy36\lib\site-packages\ifcopenshell\ifcopenshell_wrapper.py", line 1478, in add

return _ifcopenshell_wrapper.file_add(self, entity)

TypeError: in method 'file_add', argument 2 of type 'IfcUtil::IfcBaseClass *'

Is the recipe still operating with the new updates ?

[IfcOpenBot]

Original comment by Mohammad Najjar on 2021-07-01 16:40:19

---

This looks very interesting. I don't know how far this can go! Will we be able to create a bim creation tool starting from here? obviously we can create levels, wall, windows and maybe slabs. So it worth trying.

[IfcOpenBot]

Original comment by Mohammad Najjar on 2021-07-01 16:40:19

---

This looks very interesting. I don't know how far this can go! Will we be able to create a bim creation tool starting from here? obviously we can create levels, wall, windows and maybe slabs. So it worth trying.

Original comment by thomas on 2021-08-07 12:49:18

---

Be sure to have a look at https://blenderbim.org/

[keshavanarayan]

When I run the file, I get this error at this line -

 f.write(template)
TypeError: a bytes-like object is required, not 'str'

How do I get rid of this error?

[aothms]

@keshavanarayan

Change open(temp_filename, "wb") into open(temp_filename, "w") to open the file in text mode.

Since this tutorial has been written there is also ifcopenshell.template.create() which does more or less the same without the temporary file. https://github.com/IfcOpenShell/IfcOpenShell/blob/v0.7.0/src/ifcopenshell-python/ifcopenshell/template.py

[keshavanarayan]

Hi @aothms,

Thank you for your insights.
I have one more question.
How to convert an existing mesh(say like an .obj file) into an IFCFURNISHINGELEMENT type using Ifcopenshell?

[Moult]

@keshavanarayan this might help: https://github.com/IfcOpenShell/IfcOpenShell/blob/v0.7.0/src/blenderbim/scripts/obj2ifc.py

[aothms]

There is also ifcopenshell.geom.serialize() and ifcopenshell.geom.tesselate() that work based on the input of a Open Cascade shape. If you're reading mesh data from OBJ it's indeed more efficient to bypass opencascade and write as a IFC faceset directly as suggested by @Moult

[keshavanarayan]

Hi @aothms @Moult,

Thank you so much for your help. I created an IFC wall file following this tutorial using my own inputs, I am getting the .IFC file and the python is also not showing errors. However, I am unable to open the ifc file. I have uploaded the python files I have used and a visual explanation of what I have done in the readme file. Please let me know of what mistake I am doing when you're free.

https://github.com/keshavanarayan/ifcwall-test/tree/main

[aothms]

@keshavanarayan you don't actually assign the wall to the building storey (IfcRelContainedInSpatialStructure) some viewers only show elements that are part of the spatial structure.

[keshavanarayan]

Hi @aothms,

Thank you so much. :)
So for creating slabs replacing this function [ifcfile.createIfcWallStandardCase()] with [ifcfile.createIfcSlab()] helps? Is there any documentation that I can read on creating slabs, columns, etc in a similar manner?

[keshavanarayan]

Hi @aothms,

I tried to create a custom wall mesh inspired by the obj2ifc.py file. On running the file I get this error as shown below. I have put my python file in this github repo for your reference.

https://github.com/keshavanarayan/ifcwall-test/tree/main

File "d:/00PortFolio/IFC/TOSEND_testwall/ifcwall-test/mesh2ifc.py", line 109, in <module>
    [file.createIfcCartesianPoint(vertices[index]) for index in face]
  File "d:/00PortFolio/IFC/TOSEND_testwall/ifcwall-test/mesh2ifc.py", line 109, in <listcomp>
    [file.createIfcCartesianPoint(vertices[index]) for index in face]
  File "C:\Users\kesha\AppData\Local\Programs\Python\Python38\lib\site-packages\ifcopenshell\file.py", line 276, in create_entity
    e[idx] = arg
  File "C:\Users\kesha\AppData\Local\Programs\Python\Python38\lib\site-packages\ifcopenshell\entity_instance.py", line 196, in __setitem__
    self.method_list[idx](self.wrapped_data, idx, entity_instance.unwrap_value(value))
  File "C:\Users\kesha\AppData\Local\Programs\Python\Python38\lib\site-packages\ifcopenshell\ifcopenshell_wrapper.py", line 4857, in setArgumentAsAggregateOfDouble
    return _ifcopenshell_wrapper.entity_instance_setArgumentAsAggregateOfDouble(self, i, v)
TypeError: Attribute of type AGGREGATE OF REAL needs a python sequence of floats

[aothms]

@keshavanarayan

If vertices[index] is a numpy float then ifcopenshell will not recognize it.

Try:

tuple(map(float, vertices[index])) to convert to a tuple of python floats.

[EstebanDugueperoux2]

Hi,

Thanks for this nice tutorial to teach IFC.
I have tried code on Fedora 37 using Python 11 but when executing 'container_project = ifcfile.createIfcRelAggregates(create_guid(), owner_history, "Project Container", None, project, [site])' line I get a segfault.
I get also a segfault when reproducing in Github gitpod after a 'pip install ifcopenshell'.

I'm single to have a such segfault?

See https://github.com/EstebanDugueperoux2/ifc-test to reproduce.

Regards.

[aothms]

@EstebanDugueperoux2 I can't reproduce that. Can you try with the latest version here IfcOpenBot/IfcOpenShell@07ee62e#comments Otherwise open a bug at https://github.com/IfcOpenShell/IfcOpenShell/issues