In this tutorial, you will learn how to create a code plugin that adds a custom asset type (complete with its own editor) to the engine. As an example, I will walk you through the creation of a normal distribution asset type with mean and standard deviation properties that can be set in a graphical editor.
https://dev.epicgames.com/community/learning/tutorials/vyKB/unreal-engine-creating-a-custom-asset-type-with-its-own-editor-in-c
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