topic Re: IFC 4.3 Set IFC basepoint in Civil 3D Forum

IFC 4.3 Set IFC basepoint

Ruth_Bosch — Wed, 29 Nov 2023 11:47:01 GMT

I installed the IFC4.3 extension for Civil 3D. Is it possible to set the rotation of the IFC Base Point? In my opinion I can only set the xy position of the IFC Base Point...

Re: IFC 4.3 Set IFC basepoint

tmachado — Wed, 29 Nov 2023 14:12:24 GMT

Hi @Ruth_Bosch ,
Try to have the rotation set on the file first, and then export.
you are using C3D so your files should be geolocated accordantly.
we don't use geolocation by reference, the export should be 0,0

Re: IFC 4.3 Set IFC basepoint

jochemZMHQ7 — Tue, 05 Dec 2023 08:16:37 GMT

Hi Tatiana,

Thank you for replying to this post, but this doesn't answer our question just yet. I am a colleague of Ruth and will try to elaborate on te problems we are having.

We are a civil engineering firm and we work in civil3d. Our projects are alligned to the local coordinate system of our project. We are based in The Netherlands, so we mostly use 'Amersfoort-RD'.

In most projects we work for architectural firms that design and construct a building and hire us to do the terrain around the building. These firms do not work with a coördinate system as we do, they work with a basepoint, usually some x,y distance from a corner of the building.

So we are looking for the best way to allign these two models in an IFC export. The IFC4x3 plugin allows for a basepoint to be picked, but that doens't adjust hight or rotation. Changing the UCS doesn't change anything either.

How would you align the models without drastically having to alter the civil3D drawing?

Thank you in advance!

Re: IFC 4.3 Set IFC basepoint

tmachado — Fri, 15 Dec 2023 21:40:46 GMT

Hi @jochemZMHQ7 and @Ruth_Bosch
the rotation and correct high must be set on your file, that is true to placement then pick your x,y when exporting.
Testing this out in Navis.
the other thing you can do is use the 0,0 in C3D like Revit does, this will kill me but just like if you will be assigning coordinates by reference.
If you upload couple of dummy files I can help

Re: IFC 4.3 Set IFC basepoint

Ruth_Bosch — Tue, 16 Jan 2024 10:54:10 GMT

Hi Tatiana,

You can find the dummy file attached. In this file I'd like to export the pipe networks and surface by using the IFC 4.3 Add-in. The drawing is georeferenced to a Dutch coordinate system. For exporting to IFC I already set the IFC Base Point to the desired base point = red block on 0.0 (similar to 0.0 in UCS 'nulpunt'). The only issue that remains is that I'd set the rotation according to the green block that is also postioned at 0.0.

Do you know how to solve this?

Re: IFC 4.3 Set IFC basepoint

flurin_furger — Tue, 09 Dec 2025 15:59:20 GMT

Hello everyone 😊

Have there been any new findings or features added? I'm facing the same problem...

Best regards

Flurin