I have a parent object with numerous child objects and made also a bunch of linked copies (via alt+D) of said parent object inside my scene. As it turns out, I need to merge the child objects into the mesh of the parent object now and was wondering if there is a way to accomplish that without breaking the link to all the linked copies and basically propagate the same change to all of these linked copies. The problem is, that memory usage of the scene would just explode if I loose the linked duplicates.
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Let say the object A has a lot of linked duplications, and object A has a mesh called A'. Let say you have a B object with a mesh called B'. You want B' to be part of A. If you select B object, then select A, then ctrlJ, the A object is now made of the A' + B'. All the A linked copies are now made of A' + B'. It won't explode any memory as a linked duplication doesn't weigh on the file.
Now, if B was also linked duplicated and you need to delete all the now useless copies of B (considering B' is now part of A), you can select one of the B objects and press shift L Select Linked > Object Data and it will select all the Bs. Then X to delete.
Does it answer?
answered Jan 22, 2019 at 11:16
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$\begingroup$ Hmm... First of all thank you very much for your answer! Unfortunately that is exactly NOT the behavior I've observed when doing exact that (except A in my case is the parent of B and I tried to merge all children into A). None of the linked duplicates changed in any way when I performed the merge :(. But I went the long way in the meantime, made the merge and created all new linked duplicates of the merged mesh. Thanks again for trying to help though, I appreciate this! $\endgroup$– FragegoCommented Jan 23, 2019 at 12:11
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$\begingroup$ it is the behavior of a linked duplication, you must have duplicated with no link! Linked duplication is alt D, simple duplication is shift D $\endgroup$ Commented Jan 23, 2019 at 12:24