As seen in the image, DrawDebugLine lets the user set the colour right on the node’s input pin.
How does one make their own BP function with a FColor input that does the same thing?
Answer: Don’t use a Color input, use a LinearColor. The colour picker then appears automatically.
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Did you look at the code for that “Draw Debug Line” node, and try to repeat its setup in a custom BP function?
Hi, any reason you don’t want to use “Linear Color” as variable type?
I didn’t think of that, thanks 
Looks like I answered without noticing your comment. I didn’t know LinearColor was a thing, and that was indeed the solution. Thanks