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I have a set of group instances that pull data from a group linked in another file. I want to reset them to get their data from a group in the same file, so that I can animate their rotation.

My understanding is what I want to do is remap users for the empty, to a different group, however when I try to do that, the error shown is that this can't be done for a multi-user object.

I'm not clear on what is happening here. How can I remap these groups?

screenshot of remap pop-up over outliner editor

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Group Instances can actually be created from any object type, but by default when inserted from the menu an Empty object is created.

Empty objects don't have any object data thus can't be "remapped" in the traditional sense. Group instances are stored instead as Dupligroup property on the object itself.

To change which group is being instanced by a certain object go to the Properties Window > Object Tab > Duplication and from the Group box pick the desired group.

To mass change on a large number of object select them all so that the object with the correct Dupligroup is active then use the Link Menu with Ctrl + L Make Links > Dupligroup.

enter image description here

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  • $\begingroup$ I have to ask - why might one make a group instance out of another kind of object? And thanks. $\endgroup$ – kim holder Sep 28 '18 at 18:49
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    $\begingroup$ It could be a placefolder. You could use its geometry as say, a bounding box, a visual guide or reference, as a snapping cage, or even a simplified version of said object for viewport performance reasons. See blender.stackexchange.com/questions/64064/… $\endgroup$ – Duarte Farrajota Ramos Sep 28 '18 at 22:20

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