What is Scratch Pad Module in Niagara?
What is difference btw Scratch Pad Module and Niagara module script?
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Scratch pad modules are basically one-off module behaviors that you only want to use in this particular Niagara system. There’s no real difference aside from the fact that you don’t have to name them and save them to disk. It’s sort of like putting blueprints directly in a level blueprint, instead of having to create an actor that contains the blueprint code you want to write.
If you later decide you want to use a module you wrote in scratch pad, you can promote it to an asset and save it to disk, then other particle systems can reference it.
There’s a lengthy description in this video (provided by another user in this thread):
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