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Man, figuring out how to manually position particles in Niagara was a huge PITA. Docs mention Niagara Data Channels and Niagara Data Interfaces but so much of it is out of date and / or incomplete it's kinda *worse* than it not being there at all.

In the end I discovered I could do it just with user array parameters indexed with particle IDs, which *become* data interfaces, something never mentioned in the docs so making the connection was extremely hard. I feel a blog post coming on