プレイヤーとマウス間を結ぶベクトルを取得したい

i’ve used a translation tool. if i understood correctly:
i would do a line trace from the camera to the world. then get the coordinate of the collision.
this video seems what you’re trying to do.

or you can use GetHitResultUnderCursorByChannel. which i haven’t used but sounds like it does the same but simpler.