Normal or Impact Normal?

Development Programming & Scripting Blueprint
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1

I don’t understand the difference between Normal and Impact Normal in Hit Result.
I’ve tried searching but only find vague answers. (This may be due to a nuance in the translation)
What are the differences?
Which should you use to calculate the angle at which the bullet hit?

2

They look very similar, but the descriptions are different…

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They are very different if you use a sphere trace, for example ( on a curved edge ).

Anyway, for a bullet, I’d use reflection vector

3

So normals only work for sphere trace?
Does this mean that there is no need to use it for physical hits or line tracing?

4

If you want something that behaves like a bullet, then line trace is fine.