How do I make a blood system with raycast?

I have seen that many games have a similar blood system where the blood drop sticks to a wall for example with Normal I guess, on a wall and I want to make one like the one in this video:

But I do not know how to do it.
The user who did this used raycast but I don’t know when, does anyone have an idea?

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Just a warning, blood in your game can (possibly) get your game moderated. You also cannot add your game to Xbox as blood is not allowed.

yes, I do not plan to add too much blood or put the game on console :sweat_smile: