Linked files and IFC export

[F_Rosa]

In order to give a greater coverage of the subject discussed in the post (https://forum.freecadweb.org/viewtopic. ... 0&start=20), I created this one where we can continue to expose our experiences, problems and solutions about it.

First, to export FC to IFC file, I consulted: https://wiki.freecadweb.org/Arch_IFC.

About the FC file used, see: https://forum.freecadweb.org/viewtopic.php?f=3&t=49845

So, from originals FC objects to IFC format, I set up the preferences: Add defaults site and building ON; "Export full FreeCAD parametric model" OFF (to see only final objects);

• The result was: https://view.ifcopenshell.org/v/fRSIjhw ... QNmOFTzaOe.

IFCOpenShell_viewer.jpg (113.83 KiB) Viewed 3376 times

To export FC links of objects to IFC format:

• I created simple copies of all complex objects;

• Preferences: Add defaults site and building ON; "Export full FreeCAD parametric model" ON;

• See:https://view.ifcopenshell.org/v/nVKkFOm ... DyXIHBSjyF

IFCOpenShell_viewer2.jpg (127.13 KiB) Viewed 3376 times

[paullee]

Thanks for sharing!

Do you find the 'Export full FreeCAD parametric model" effective ?

[F_Rosa]

If you want to continue your project in another cad program, yes. In the case of linked files, is the one option I've found, for now.

In the future, a option to open the IFC file with the dependent objects hide, it would be nice!

[thomas-neemann]

....If you want to continue your project in another cad program,....

bim ifc is not intended as a data exchange format for further processing of drawings. the ifc file should not be changed similarly to pdf. it serves e.g. as a reference for connection structures. e.g. construction of a heating system in an ifc building model

[F_Rosa]

bim ifc is not intended as a data exchange format for further processing of drawings. the ifc file should not be changed similarly to pdf. it serves e.g. as a reference for connection structures. e.g. construction of a heating system in an ifc building model

Well, as there was no immediate response to this statement, it seems that this matter should be better discussed.

IFC does not necessarily need to be used only as a reference file or just an output file such as a PDF. This would be a tremendous limitation on the use and application of IFC in BIM. One of its goals is to enable interoperability between programs and disciplines within the BIM philosophy, in all its phases, including preparatory ones.

We could cite numerous cases of file exchanges between programs and disciplines before establishing the BIM, a subject exposed in figures 1 and 9 of the post (https://forum.freecadweb.org/viewtopic.php?f=23&t=59192). What better way to exchange parametric files between different programs than using IFC? Either between different and similar disciplines, or even the option of using different programs for the same file/discipline, using the best resources that each one offers (example: FC and Blender).

In addition, it is worth noting that not all BIM platforms work exclusively with IFC, but of course, as also exposed in the aforementioned post, once a discipline completes a project stage and sends its file (IFC or other) to the BIM model, from then on, it is appropriate that this file is not altered by anyone other than the author. There is a lot of ways to do this, not necessarily only with IFC files.

[thomas-neemann]

there have already been heated discussions on the topic, I've seen a good video somewhere, if I find it again I'll link it here

[paullee]

Not aware of the discussion / debate about the usage of IFC

Any consensus at the moment ?

Thanks.

[thomas-neemann]

I've found it again. here is the cutout

https://www.youtube.com/watch?v=C5p0kt0rFxE


here the whole video

https://www.youtube.com/watch?v=zKOm40hPWPE



The unique advantage of freecad is that nobody has to import freecad 3d modell for further processing, everyone can use freecad and thus further process freecad models.

Greetings Thomas

[F_Rosa]

Sorry Thomas, but I didn't see a heated debate on the subject, as you mention, just a presentation by a BIM expert, correct? In it, I did not hear the mention of the use of the IFC file itself used before the establishment of BIM.

As the Google translator didn't help much, could you transcribe exactly what was said in the video excerpt you attached?

[thomas-neemann]

My customers also want to import ifc and change / continue working. there are the discussions. the idea of ​​bim ifc is that the creator of an ifc file is responsible for the correctness. if other people change something, he can no longer be responsible and consequential errors are inevitable. If a wall opening is required in an ifc building file, the creator of the ifc file should make this change and create a new ifc file.