Linear Velocity Sliding

[CurlyFriyez (ドリフト)]

I am working on a slide script where the player slides after crouching if they were running. I have the character moving in the right direction but I cant seem to be able to change the slide speed. It only seems to happen when I set the MaxForce Y value to 0 so the player doesn’t float off elevated objects while sliding.

Here is my code:

    local Slide_Speed = 50

        --Check Position
	local f = false
	local b = false
	local l = false
	local r = false
	local HRP = player.Character.HumanoidRootPart
	local hum = player.Character:FindFirstChild("Humanoid")
	local idle = hum:LoadAnimation(animation_list.CrouchIdle)
	local move = hum:LoadAnimation(animation_list.Crouch)

	--Check Position
	local f = false
	local b = false
	local l = false
	local r = false
		
    --Check keys pressed
	if uis:IsKeyDown(Enum.KeyCode.W) then
		f = true
	end
	if uis:IsKeyDown(Enum.KeyCode.S) then
		b = true
	end
	if uis:IsKeyDown(Enum.KeyCode.A) then
		l = true
	end
	if uis:IsKeyDown(Enum.KeyCode.D) then
		r = true
	end
	
	--Check if in FPS / Mouse Locked--
	local Force_Chosen = nil
	if Unsaved.FPS.Value == true or Unsaved.MouseLocked.Value == true then
		
		--Set Force--
		if f then
			if l then
				Force_Chosen = (HRP.CFrame.lookVector * Slide_Speed) + (HRP.CFrame.rightVector * -Slide_Speed)
			elseif r then
				Force_Chosen = (HRP.CFrame.lookVector * Slide_Speed) + (HRP.CFrame.rightVector * Slide_Speed)
			else
				Force_Chosen = (HRP.CFrame.lookVector * Slide_Speed)
			end
		elseif b then
			if l then
				Force_Chosen = (HRP.CFrame.lookVector * -Slide_Speed) + (HRP.CFrame.rightVector * -Slide_Speed)
			elseif r then
				Force_Chosen = (HRP.CFrame.lookVector * -Slide_Speed) + (HRP.CFrame.rightVector * Slide_Speed)
			else
				Force_Chosen = (HRP.CFrame.lookVector * -Slide_Speed)
			end
		elseif l then
			Force_Chosen = (HRP.CFrame.rightVector * -Slide_Speed)
		elseif r then
			Force_Chosen = (HRP.CFrame.rightVector * Slide_Speed)
		end
		
	else
		Force_Chosen = HRP.CFrame.lookVector * Slide_Speed
	end
	
	--Set up Linear Velocity--
	local LV = Instance.new("LinearVelocity")
	LV.Parent = HRP.Slide
	LV.MaxForce = Vector3.new(math.huge, 0, math.huge)
	LV.VectorVelocity = Vector3.new(Force_Chosen.X, 0, Force_Chosen.Y)
	LV.Attachment0 = HRP.Slide
	
	local SDA_info = TweenInfo.new(Slide_Time, Enum.EasingStyle.Linear, Enum.EasingDirection.In)
	local Slide_Distance_Anim = ts:Create(LV, SDA_info, {VectorVelocity = Vector3.new(0,0,0)})
	Slide_Distance_Anim:Play()

When MaxForce = Vector3.new(math.huge, 0, math.huge)
robloxapp-20230728-1924385.wmv (2.2 MB)

When MaxForce == math.huge
robloxapp-20230728-2204487.wmv (1.6 MB)

When MaxForce = math.huge, it Tweens correctly and the Slide_Speed Variable works properly where the character slowly stops sliding. Although, the character will float if they slide off an elevated surface. Is there a way I can have the Tween and Variable run properly while maintining gravity? If not, is there is a better method I should go about doing this?

[progamers246810 (Fahoowey)]

I would recommend using another force instead, maybe line force would do the trick. Also if you want the force to go in the direction of the players movement just use the move direction property of the humanoid. Your code is much more complicated than it needs to be

[CurlyFriyez (ドリフト)]

I solved this issue myself luckily!

If anyone ever runs into this issue, you need to set the Constraint mode to Plane and set the values from there! This still allows gravity and prevents any forces on the Y axis.

    --Set up Linear Velocity--
	local LV = Instance.new("LinearVelocity")
	LV.MaxForce = math.huge
	LV.RelativeTo = Enum.ActuatorRelativeTo.World
	LV.VelocityConstraintMode = Enum.VelocityConstraintMode.Plane
	LV.PrimaryTangentAxis = Vector3.new(1,0,0)
	LV.SecondaryTangentAxis = Vector3.new(0,0,1)
	LV.PlaneVelocity = Vector2.new(Force_Chosen.X, Force_Chosen.Z)
	LV.Attachment0 = HRP.Slide
	LV.Parent = HRP