[IfcOpenShell-Python] How to create a cone in an ifc file? i asked chatgtp

M by Martin156131 on 1 Feb 2023, edited 14 Feb 2023 # +1 votes

So i did a little test with chatgtp, how good it can help to code for ifc.

see here my chat with chatgtp https://refined-github-html-preview.kidonng.workers.dev/Martin15135215/git_ifc_test/raw/main/chatgtp_cone_ifcopenshell_python.html

It was not so good as i hoped, however i found out with chatgtp that there is indeed an ifc entity IfcRightCircularCone https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/link/ifcrightcircularcone.htm

and then with a bit research with https://sourcegraph.com/ i found an ifc file that did use IfcRightCircularCone https://github.com/buildingSMART/Sample-Test-Files/blob/master/IFC%204.0/BuildingSMARTSpec/geographic-referencing.ifc

and also with this python script as inspiration https://github.com/IfcOpenShell/IfcOpenShell/blob/v0.7.0/src/blenderbim/scripts/obj2ifc.py

i think it is possible to create an python script that will create a cone

tdlr: with only chatgtp, i think that would be diffucult -> however that could maybe change in the future

C by Coen on 3 Feb 2023 # +6 votes

I also asked chatGPT a question:

T by theoryshaw on 3 Feb 2023, edited 3 Feb 2023 # +1 votes

Dear chapGPT, is there an easier way to make money? ;)

I'm a noobie too, but the following seems to work...


import bpy

import ifcopenshell

from ifcopenshell.api import run

import numpy

import bpy


ifc_file = ifcopenshell.file()


project = run("root.create_entity", ifc_file, ifc_class="IfcProject", name="Demo")


run("unit.assign_unit", ifc_file, length={"is_metric": True, "raw": "METERS"})


context = run("context.add_context", ifc_file, context_type="Model")

body = run("context.add_context", ifc_file,context_type="Model", context_identifier="Body", target_view="MODEL_VIEW", parent=context)


# Create a site, building, and storey. Many hierarchies are possible.

site = run("root.create_entity", ifc_file, ifc_class="IfcSite", name="My Site")

building = run("root.create_entity", ifc_file, ifc_class="IfcBuilding", name="Building A")

storey = run("root.create_entity", ifc_file, ifc_class="IfcBuildingStorey", name="Ground Floor")


# Since the site is our top level location, assign it to the project

# Then place our building on the site, and our storey in the building

run("aggregate.assign_object", ifc_file, relating_object=project, product=site)

run("aggregate.assign_object", ifc_file, relating_object=site, product=building)

run("aggregate.assign_object", ifc_file, relating_object=building, product=storey)


elementproxy = ifcopenshell.api.run("root.create_entity", 

                                ifc_file,

                                ifc_class="IfcBuildingElementProxy", 

                                predefined_type=None,

                                name="testy"

                                )


position = ifc_file.createIfcAxis2Placement3D(ifc_file.createIfcCartesianPoint((1.0, 2.0, 3.0)))

cone = ifc_file.create_entity("IfcRightCircularCone")

cone.Height = 1000.0

cone.BottomRadius = 500.0

cone.Position = position


representation = ifc_file.create_entity("IfcShapeRepresentation")

representation.ContextOfItems = context

representation.RepresentationIdentifier = "Body"

representation.RepresentationType = "CSG"

representation.Items = [cone]


ifcopenshell.api.run("geometry.assign_representation", ifc_file, product=elementproxy, representation=representation)

run("spatial.assign_container", ifc_file, relating_structure=storey, product=elementproxy)


file_name="elementproxy"

folder_path = "C://Users//Owner//Desktop"

filename = str(file_name) + ".ifc"

file_path = (folder_path + filename)


ifc_file.write(file_path)

C by Coen on 3 Feb 2023, edited 3 Feb 2023 # +1 votes

@theoryshaw said:

Dear chapGPT, is there an easier way to make money? ;)

Haha, I only asked for a way to fund osarch ;-)

Script creates a nice cone by the way :-)

M by Moult on 4 Feb 2023 # +5 votes

Huh.

C by Coen on 4 Feb 2023 # +9 votes

@Moult

You're phrasing the question wrong ;-)

M by Martin156131 on 13 Feb 2023 #

@theoryshaw

With your script i successfully created a cone, and i could open it in BIMvision, however I could not open it in BlenderBIM :(

M by Martin156131 on 13 Feb 2023 # +1 votes

@theoryshaw i think IfcCsgSolid is missing in your script between IFCSHAPEREPRESENTATION and IFCRIGHTCIRCULARCONE

I made this script


import ifcopenshell

import ifcopenshell.api

import ifcopenshell.api.owner.settings

version = "IFC4"

basename = "My Project"

file = ifcopenshell.api.run("project.create_file", version=version)

person = ifcopenshell.api.run("owner.add_person", file)

person[0] = person.GivenName = None

person.FamilyName = "user"

org = ifcopenshell.api.run("owner.add_organisation", file)

org[0] = None

org.Name = "template"

user = ifcopenshell.api.run("owner.add_person_and_organisation", file, person=person, organisation=org)

application = ifcopenshell.api.run("owner.add_application", 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", file, ifc_class="IfcProject", name=basename)

lengthunit = ifcopenshell.api.run("unit.add_si_unit", file, unit_type="LENGTHUNIT", name="METRE")

ifcopenshell.api.run("unit.assign_unit", file, units=[lengthunit])

model = ifcopenshell.api.run("context.add_context", file, context_type="Model")

context = ifcopenshell.api.run(

    "context.add_context",

    file,

    context_type="Model",

    context_identifier="Body",

    target_view="MODEL_VIEW",

    parent=model,

)

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

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

storey = ifcopenshell.api.run(

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

)

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

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

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


origin = file.createIfcAxis2Placement3D(

    file.createIfcCartesianPoint((0.0, 0.0, 0.0)),

    file.createIfcDirection((0.0, 0.0, 1.0)),

    file.createIfcDirection((1.0, 0.0, 0.0)),

)


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


cone_rep = file.create_entity("IfcRightCircularCone", Position=origin, Height=0.5 , BottomRadius=0.15)

cone = file.create_entity("IfcCsgSolid", TreeRootExpression=cone_rep )

representation = file.createIfcProductDefinitionShape(

                None,

                None,

                [

                    file.createIfcShapeRepresentation(

                        context,

                        "Body",

                        "CSG",

                        [cone],

                    )

                ],

            )

product = file.create_entity(

                "IfcBuildingElementProxy",

                **{

                    "GlobalId": ifcopenshell.guid.new(),

                    "Name": "Cone",

                    "ObjectPlacement": None,

                    "Representation": representation,

                }

            )

ifcopenshell.api.run("spatial.assign_container", file, product=product, relating_structure=storey)


file.write("cone.ifc")

i could then open this ifc file in BlenderBIM

C by Coen on 13 Feb 2023 # +1 votes

@Martin156131

Nice! Are you trying to script an IfcGardenGnome? ;-)

M by Martin156131 on 13 Feb 2023, edited 13 Feb 2023 # +1 votes

@Coen

No no ? much simpler, I am trying to create an arrow


import ifcopenshell

import ifcopenshell.api

import ifcopenshell.api.owner.settings

version = "IFC4"

basename = "My Project"

file = ifcopenshell.api.run("project.create_file", version=version)

person = ifcopenshell.api.run("owner.add_person", file)

person[0] = person.GivenName = None

person.FamilyName = "user"

org = ifcopenshell.api.run("owner.add_organisation", file)

org[0] = None

org.Name = "template"

user = ifcopenshell.api.run("owner.add_person_and_organisation", file, person=person, organisation=org)

application = ifcopenshell.api.run("owner.add_application", 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", file, ifc_class="IfcProject", name=basename)

lengthunit = ifcopenshell.api.run("unit.add_si_unit", file, unit_type="LENGTHUNIT", name="METRE")

ifcopenshell.api.run("unit.assign_unit", file, units=[lengthunit])

model = ifcopenshell.api.run("context.add_context", file, context_type="Model")

context = ifcopenshell.api.run(

    "context.add_context",

    file,

    context_type="Model",

    context_identifier="Body",

    target_view="MODEL_VIEW",

    parent=model,

)

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

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

storey = ifcopenshell.api.run(

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

)

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

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

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


origin = file.createIfcAxis2Placement3D(

    file.createIfcCartesianPoint((1.0, 1.0, 0.0)),

    file.createIfcDirection((0.0, 0.0, 1.0)),

    file.createIfcDirection((1.0, 0.0, 0.0)),

)

placement = file.createIfcLocalPlacement(None, origin)

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

height = 0.5

origin_cone = file.createIfcAxis2Placement3D(

    file.createIfcCartesianPoint((0.0, 0.0, height)),

    file.createIfcDirection((0.0, 0.0, -1.0)),

    file.createIfcDirection((-1.0, 0.0, 0.0)),

)

cone_rep = file.create_entity("IfcRightCircularCone", Position=origin_cone, Height=height , BottomRadius=0.15)

cone = file.create_entity("IfcCsgSolid", TreeRootExpression=cone_rep )


origin_cylinder = file.createIfcAxis2Placement3D(

    file.createIfcCartesianPoint((0.0, 0.0, height)),

    file.createIfcDirection((0.0, 0.0, 1.0)),

    file.createIfcDirection((1.0, 0.0, 0.0)),

)


cy_rep = file.create_entity("IfcRightCircularCylinder", Position=origin_cylinder, Height=height , Radius=0.05)

cylinder = file.create_entity("IfcCsgSolid", TreeRootExpression=cy_rep )




representation = file.createIfcProductDefinitionShape(

                None,

                None,

                [

                    file.createIfcShapeRepresentation(

                        context,

                        "Body",

                        "CSG",

                        [cone, cylinder],

                    )

                ],

            )

product = file.create_entity(

                "IfcBuildingElementProxy",

                **{

                    "GlobalId": ifcopenshell.guid.new(),

                    "Name": "Arrow",

                    "ObjectPlacement": placement,

                    "Representation": representation,

                }

            )

ifcopenshell.api.run("spatial.assign_container", file, product=product, relating_structure=storey)


file.write("arrow.ifc")

N by Nigel on 13 Feb 2023 #

Is it a virtual penetrometer?

M by Martin156131 on 14 Feb 2023 #

No, that's not what I had in mind. I rather think that if you measure points outside, for example, you also want to show this in the IFC model. These arrows are there to visualize the measured points appropriately in the model. There are certainly other applications for these arrows, but that was my thought :)