# IFC Enhanced Export Linked Models

Have you found when exporting IFC files from Revit, that if you have a host file with multiple links then the links which are "clones" will have objects with duplicate GUID's? This is a problem when the IFC files are used downstream for costing or construction scheduling software that required unique GUID's. (This also occurs with DWFX exports from Revit).

<figure><img src="/files/g40dz9GyZYqcu8XLZBnc" alt=""><figcaption></figcaption></figure>

Probably of greater impact are "mirrored" Links that will not be exported.

One solution is to Bind all the files into the host file and to mirror the links before linking them in again. This can create very large and cumbersome files. Seems to be defeating the efficiency of using Linked files....and may not fully solve the issue.

Geometry Gym has developed an additional feature with the Export IFC Enhanced tool to enable multiple Links to be assigned unique GUID's and mirrored Linked files to be exported.

It currently supports one level of Links, with nested Link support to come.

Perhaps worth a try? More to come.

There are two videos to help explain this process.

Video 1: IFC export from Revit including linked files

{% embed url="<https://youtu.be/W5-xHPStHTc>" %}
IFC Export from Revit including Linked Files
{% endembed %}

0:00 - 1:39 Standard Revit export of apartment project host file with 4 links of the same file. 2 mirrored and 2 non-mirrored.

1:39 - 2:39 Exported IFC files in Solibri Model Checker with duplicate object GUID's.

2:39 - 4:44 Geometry Gym Enhanced IFC export of apartment project host file with 4 links of the same file. 2 mirrored and 2 non-mirrored.

4:44 - 5:54 5 Exported IFC files in Solibri Model Checker of apartment project: 1 host file with 4 links of the same file. 2 mirrored and 2 non-mirrored.

5:54 - 7:24 Exported IFC files in Solibri Model Checker with unique object GUID's 2 versions of apartment IFC exports with persistent GUID's.

Video 2: Geometry Gym Export IFC Enhanced tool for Revit linked models

{% embed url="<https://youtu.be/KBMud0T53R4>" %}
Geometry Gym Export IFC enhanced tool for Revit with Linked Models
{% endembed %}

(The videos have been created in a 'Spielberg free zone')


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