Making something turn relative to a character with an angle

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1

I am making a sword fighting game, the main mechanic is rotating the sword,
here is an example

my problem is that when i tried applying it to the player i realized that it only works as intended in one direction

How does this work ?
it takes the position of the guielement in the middle of the screen, uses math.atan2 to find an angle, (this part works fine)

i then send it to the server and apply a cframe to the sword to make it rotate correspondingly
to be more precise i use sin and cosin to find the x and y of the point im using to change the cframe of the sword (this is the part that only works in one direction)

here is the code simple

	local position = script.Parent.axis.Position
	local lookingvectorx = math.sin(angle)*15
	local lookingvectory = math.cos(angle)*15
    local lookingvector = Vector3.new(lookingvectorx,lookingvectory,0)
	script.Parent.axis.CFrame = CFrame.new(position,position+lookingvector)

to reiterate im stumped on the maths behind making this relative to another position

on a sidenote this doesnt look as horrible when using a more blocky character
Screenshot (1015)

2

You should probably rotate the looking vector by the character’s CFrame.

Don’t base the current CFrame off the previous CFrame, you’ll get weird precision issues over time.

Also, I don’t think you need to create a lookvector like this, you can just rotate by the angle directly:

local DISTANCE_IN_FRONT = 2
script.Parent.axis.CFrame = HumanoidRootPart.CFrame
  * CFrame.new(0, 0, -DISTANCE_IN_FRONT)
  * CFrame.Angles(0, 0, angle)
3

It does work but it has this funny result

4

Just wanted to add that i have fixed it by rotating the axis