Linking Pre-existing Models as References

From Trinity Reign Wiki

So you accidentally duplicated your models instead of reference duplicating (alt+d). Here's how to link them as references.

1. Select all of the objects you want to link. Note that the last object you select will be the original object.
2. Go to the editing panel (F9).
3. Find the 'Center New' button and press it. This will keep your models from changing to screwy positions after the link.
4. Click 'Object' on the viewport and then go to 'Make Links->Mesh Data'