Lets say I know what is directly above a turret. I also know where the turrets gun is currently pointing. I would like to know where will the turret's gun will point if I rotate it.

I suppose I could multiply A (.) B, project A on the plane B is a normal of and then do the rotation in 2d and add back A (.) B but I am sure the math should be simpler than that?

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you want to reflect A across B, this has a simple formula: (if B has length 1)


or minus A plus 2 times the dot product between A and B

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