How to add knocback to a punch

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#1

i made a punch from. a youtube tutorial, it deals damage but no knockback idk how to put knockback i can send scripts if someone asks

#2

check for humanoid root part and then add velocity to the humanoid root part.

something like this:

if humanoidRootPart then
	local knockback = Instance.new("LinearVelocity")

	knockback.Attachment0 = humanoidRootPart:FindFirstChild("RootAttachment")
	knockback.MaxForce = Vector3.new(1000, 0, 1000)
	knockback.VectorVelocity = humanoidRootPart.CFrame.LookVector * -50

	knockback.Parent = humanoidRootPart

	-- Apply the knockback for a short duration
	game:GetService("Debris"):AddItem(knockback, 0.5)
end

This probably won’t work but I hope it gives you a basic idea :slight_smile:

3 Likes
#3

i’ve personally moved the logic to a function so i can reuse it somewhere else

function ImpulseAttachment(att: Attachment, velocity: Vector3, duration: number?)
	if tonumber(duration) == nil then
		duration = 1/3
	end
	
	local inst = Instance.new("LinearVelocity")
	inst.Attachment0 = att
	inst.MaxForce = math.huge
	inst.VectorVelocity = velocity / 2^duration
	inst.ForceLimitsEnabled = true
	inst.Parent = att.Parent
	
	game:GetService("Debris"):AddItem(inst, duration)
	return inst
end

local attachment: Attachment -- for example basically
ImpulseAttachment(attachment, Vector3.new(0,1/3,-1).Unit * 600)

but you need to use LinearVelocity for this, yeah

#4

Or you can just do:

HumanoidRootPart:ApplyImpulse(Vector3.new(10, 10, 10)
#5

As far as I know this would only run in a client sided script though since ApplyImpulse only works from the instances networkowner.

#6

so far none of those work probably cuz im putting it in the wrong space but here is the server script, let me know if u need the local script ( u probably dont need that becuz its just hitbox and animation based )

server script:

local rs = game:GetService("ReplicatedStorage")

local events = rs:WaitForChild("Events")
local hitboxEvent = events:WaitForChild("Hitbox")



function newHitbox(character, size, offset, damage, linger)
	local hrp = character:FindFirstChild("HumanoidRootPart")
	if hrp == nil then return end
	local weld = Instance.new("WeldConstraint", hrp)
	local hitbox = Instance.new("Part")
	weld.Part0 = hrp
	weld.Part1 = hitbox

	hitbox.Transparency = 1
	hitbox.CanCollide = false
	hitbox.CanQuery = false
	hitbox.Massless = true

	hitbox.Size = size
	hitbox.CFrame = hrp.CFrame + hrp.CFrame.LookVector * offset.X + Vector3.new(0,offset.Y)
	hitbox.Parent = character

	hitbox.Touched:Connect(function(hit)
		if hit.Parent:FindFirstChild("Humanoid") == nil then return end

		for _, v in pairs(hitbox:GetChildren()) do
			if v:IsA("ObjectValue") then
				if v.Value == hit.Parent then return end
			end
		end

		local hitCounter = Instance.new("ObjectValue", hitbox)
		hitCounter.Value = hit.Parent

		hit.Parent.Humanoid:TakeDamage(damage)
		
		local sound = script.Sound:Clone()
		sound.Parent = hit.Parent:FindFirstChild("Humanoid")
		sound:Play()
		game.Debris:AddItem(sound,2)
		local punchParticle = game.ReplicatedStorage["Particle"].Attachment:Clone()
		punchParticle.Parent = hit.Parent:FindFirstChild("HumanoidRootPart")
		for i, v in pairs(punchParticle:GetChildren()) do
			if v:IsA("ParticleEmitter") then
				v:Emit(30)
				game.Debris:AddItem(punchParticle,0.4)
			end
		end
	end)

	game.Debris:AddItem(hitbox, linger)
end

hitboxEvent.OnServerEvent:Connect(function(plr, size, offset, damage, linger)
	newHitbox(plr.Character, size, offset, damage, linger)
end)
#7

did you put anything for the parameters on the second to last line?

#8

This is a bounce back script. Designed to do just that when it’s touched. This works well but, you will need to modify it a bit for your case. Everything you need is here and tested.

--serverscript .. atm in a part (with touch enabled) on the workspace

local db=true
script.Parent.Touched:Connect(function(hit)
	local humanoid=hit.Parent:FindFirstChildOfClass("Humanoid")
	if humanoid and db then	db=false
		local bv=Instance.new("BodyVelocity")
		bv.Parent=hit.Parent:WaitForChild("LowerTorso")
		bv.MaxForce=Vector3.new(100000, 100000, 100000)
		bv.Velocity=hit.Parent.Head.CFrame.LookVector * -80 
			+ hit.Parent.Head.CFrame.UpVector * 80
		wait(0.01)bv:Destroy()db=true
		wait(1)
	end
end)