How to rotate a 3d point from the origin, given a positional vector3 and a rotational cframe?

How to rotate a 3d point from the origin, given a positional vector3 and a rotational cframe?

I tried using quaternions and using matrix components but I can’t understand. Can built in functions be used?

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I think a jumbled mess of math like:

(CFrame.lookAt(Vector3.new(),vecOffset)*cframeOffset).LookVector

Might work