I need help with an aiming system

As of now, I’m trying to make a system allowing the player to point their arm in the direction of the cursor. I thought it would be as easy as setting a CFrame but I was wrong. Any help would be appreciated, thank you.

Is this what you mean?

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No, sorry if the wording was unclear. I want to make the player’s arms follow the mouse in the third person. Thank you, though.

I would put a local script in the player’s StarterGui or, StarterCharacterScripts.
And maybe using the mouses position, you could tween the arms Motor6Ds’ so that they point in mouses position.

Yes, but I’m trying to figure out how to do this. I understand that it’ll take some basic trigonometry, and I have it half-done rn, but it’s still a little finicky. Motor6ds take an angle measurement, in order to get that I will need to “make a triangle” and find its opposite and adjacent side measurements, then find the inverse sin of that, and that would be the angle. I’ve done this, but for some reason the arm only moves left to right and not up and down.