I am currently working on a Character Customization System where a HUDLayout dynamically create Widgets based on a set of Skins available for the Character Selected. A Skin is represented as a Struct called MaterialInstanceContainer and holds a TArray. Player can mix and match their selection according to the Body Parts they select. In order to achieve the final result, I want to create a TMap<string, MaterialInstanceContainer> so that I can map each BodyParts available for selection with the individual material instance targeting the same BodyPart.

ISSUE: My issue is as follow, when I try to foreach over my collection of Material Instances inside my Container, I do a string comparison and if the output is valid, I can then break my struct to access the Material Instance Array and ADD to it however, at the very end of the process, the length of the array inside Material Container is still at zero.

How can I add a new entry in the array that my Material Container Struct hold?

Thanks!

And here on my side it gives exacly the same result as expected:

The fix for that would be easy: After editing a Copy, you can overwrite the Map member by its copy (via 'Add' node).

But in your case it will be more tricky. You cannot just plug the same BreakStuct/Array node that you just used because it would call whole Find sequence again which creates another copy. Look

If you are confused. This code actually looks like this for Unreal's point of view.

So you have to store the the Struct in local variable first, then perform any operations on it and after everything is done - overwrite the Map member by its locally stored copy And the result is

Map member gets overwriten every time and everything is as it should be. Well, almost... For some reason your code is stored in Macro. I think you have to change it to a Function to be able to create local struct variable. But it shouldn't be a problem in this specific case because in your code there is no logic that needs to be done in macro.

Hope, it helps