How would I clamp the magnitude of a vector?

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#1

I am making a custom character controller and I want to prevent players from doubling their speed while going sideways, so I figured out I’d have to make a function that clamps the magnitude of a Vector3.

local function ClampMagnitude(v,max)
	local n = math.sqrt(v.X^3 + v.Y^3 + v.Z^3)*0.25
	local f = math.min(n,max)/n
	
	return Vector3.new(f*v.X,f*v.Y,f*v.Z)
end

I tried my best but this just won’t work and I have no clue why, please help!
Thanks in advance.

1 Like
How to set / limit Magnitude?
#2

You can use Vector3.Unit and Vector3.Magnitude

local function ClampMagnitude(v, max)
	return v.Unit * math.min(v.Magnitude, max)
end
6 Likes
#3

You’d need to account for if variable v is 0,0,0 in which case this function would return NAN,NAN,NAN (not a number)

a condition check will suffice

local function ClampMagnitude(v, max)
    if (v.magnitude == 0) then return Vector3.new(0,0,0) end -- prevents NAN,NAN,NAN
    return v.Unit * math.min(v.Magnitude, max) 
end
5 Likes
#4

LOL bro I’m so glad you posted this. I was getting NAN values for the function above and was wondering why my game just stopped for a few seconds every interval. Thanks mate.

1 Like