How do I ignore y-axis in Humanoid.MoveDirection

[SilentSuprion]

Hello, I’m creating a swim script, it’s perfect, but I want it so you can’t swim down, you can only swim left and right. How would I accomplish this? So far I tried doing something like this…

velocity = (humanoid.MoveDirection * Vector3.new(1, 0, 1)) * humanoid.WalkSpeed

but, it doesn’t work. If you need more info just reply. Any ideas are appreciated.

Thank you.

[Intencidy (smelvin)]

You can try creating a new Vector3 object with its Y-axis set to 0, and X and Z axes being set to the move direction’s.

local direction = Vector3.new(humanoid.MoveDirection.X, 0, humanoid.MoveDirection.Z)
velocity = direction * humanoid.WalkSpeed

[SilentSuprion]

Seems like a smart idea, yet it doesn’t work sadly. Here’s what I did:

swim.Velocity = Vector3.new(humanoid.MoveDirection.X, 0, humanoid.MoveDirection.Z) * humanoid.WalkSpeed

It’s weird.

[Intencidy (smelvin)]

Are there any errors in the output?

[SilentSuprion]

No, I believe it’s just the way move direction works. Is there a work around move direction or an alternative?

Humanoid.MoveDirection on Y Axis?

Internally the Humanoid only sets the Y component of MoveDirection when in the swimming state, it’s not used for jumping at all, jumping is specially-cased and separate from the normal walk/run/swim movement vector, that’s why you don’t see it changing. If you swim up and down, you should see it have a value, IIRC. Maybe not. I can’t remember if this is reflected in what is exposed to Lua.

[Intencidy (smelvin)]

Well, you could add a Vector Force inside the character’s HumanoidRootPart and change its force with the formula.

[SilentSuprion]

Okay good news! It works, but since it’s a vector force I keep sinking even if I increase the velocity.

[SilentSuprion]

Okay so I figured out the problem was because I was using body velocity. After switching to linear velocity it worked. Thank you for your time and support.