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"Convert actor" disabled for some actor types

I routinely need to add some behaviour to various types of actors that have already been placed in a map by level artists, in which case I make a new Blueprint from one of those instanciated actor. However when I then need to replace all similar instances with my new blueprint, in some cases the "Convert Actor" feature is disabled, and I need to replace them all by hand. This happens with Emitters for instance - I found no way to convert an Emitter actor into a BP inheriting from Emitter.

Anybody knows why that is? Is there a list somewhere of actor types that can be converted that way - I know it works for StaticMeshActors, what else? Is this something that's going to be possible in future versions?

Thanks :)

Product Version: UE 4.20
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asked Dec 20 '18 at 10:26 AM in Blueprint Scripting

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