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Can't save MaterialInstanceDynamic created via C++

 Can't save D:/Documents/Programming/Unreal/DMI_Bug/Content/MyMap.umap: Graph is linked to private object(s) in an external package.
 External Object(s):
 Try to find the chain of references to that object (may take some time)?

I've reproduced the bug in a standalone project and attached it here. To get the message, simply create an instance of MyActor (a C++ class) and then save.

link text

Product Version: UE 4.22
dmi-bug.zip (1.1 MB)
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asked Jul 09 '19 at 10:38 PM in Using UE4

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2 answers: sort voted first

quick update, it looks like by changing the OUTER of UMaterialInstanceDynamic::Create gets this to work changed from MeshComponent -> NULL

edit: this is a bug, not a question, not resolved

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answered Jul 10 '19 at 03:37 AM

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Okay, after trying a couple of things i think this is the best way to go. As i said earlier, dynamic material instances are made to be created and edited during runtime so i suggest creating a constant material instance based on the material you wanna edit and using that in your constructor instead of the dynamic one, which will save just fine.

And if you want to edit it at runtime, just create a dynamic one based off of it and change its parametes, here's the code i set up.


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Here's my in-editor setup with a material instance constant set to a red value, level and actor both save fine because the instance isn't dynamic.

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At runtime, a dynamic one is created and set to the mesh.

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answered Jul 11 '19 at 09:08 PM

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Moe Wattar
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avatar image ngzaharias 5 days ago

thanks for the help dude, I'll give it a go tonight when I get home

avatar image ngzaharias 4 days ago

alright yeah that does indeed work better, but it seems to have the same outcome as making a dynamic that has no outer. I guess there isn't anyway around having to store the material settings (not the worst thing).

I might look into creating a material instance with the params I want and saving it to the content browser (probably not though)

thanks for all the help! I assume that material instance dynamic settings are never meant to be saved ?

avatar image Moe Wattar 4 days ago

No problem! You can save the instance settings some other way like you said but the dynamic instance still has to be created and edited during gameplay.

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