How to do knockback using a tool like in Slap Battles

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#1

Hello developers, :wave:

I want to figure out how to deal knockback on a player but similar to Slap Battles’ knockback system. I’ve been looking around for solutions, however nothing works I tried using BodyVelocity but it still didn’t work and I don’t understand how to make the properties work so it makes the character experience knockback.

Thanks!

#2

Can we see your script? It will let me see what is wrong with your bodyvelocity

#3

Anything in the toolbox? Might give you a good start.

#4

Usually with knockback, they use a sudden huge force and delete the force a fraction of a second later. You can use bodyvelocity.

create velocity > set velocity to high numbers > wait 0.2 seconds > delete velocity > player go flying back a bit

#5

try BasePart:ApplyImpulse(Vector3)
it applies a 1 time force to the part

#6

You’re most likely using R6. If you want to implement a ragdoll system consider this one:
Ragdoll 5.2.rbxm (7.8 KB)
I made a game similar to this one and I used a temporary LinearVelocity object that was destroyed 0.2 seconds later. The only issue with LinearVelocity is that it doesn’t replicate the physics immediately, so you will need to implement a system that counteracts this issue or use BodyVelocity.

#7

or just use apply impulse
seriously why do people make instances for constant force for a short burst when apply impulse was made for this

#8

Replication lag can cause issues with ApplyImpulse and it might not work right if changing network owners.

The specific reason why I did it is to remain in compatibility of an older system I made that used BodyVelocity.

2 Likes
#9

I tried looking on the toolbox, but all of them don’t work for some reason.

1 Like
#10

Show your code so far when developing the knockback system, or add it into your original post.

#11 
local glove = script.Parent.Parent.Glove
local hand = script.Parent.Hand
local slap = script.Parent.Slap
local playerslapped = game.ReplicatedStorage:WaitForChild("PlayerSlapped")

playerslapped.OnServerEvent:Connect(function(player, targetedplayer, humanoid, locatedhead)
	slap:Play()
	local targetHumanoid = targetedplayer:WaitForChild("HumanoidRootPart")
	local playerHumanoid = player.Character:WaitForChild("HumanoidRootPart")
	if targetHumanoid and playerHumanoid then
		for _, v in pairs(targetedplayer:GetDescendants()) do
			if v:IsA("Motor6D") then
				local a0, a1 = Instance.new("Attachment"), Instance.new("Attachment")
				a0.CFrame = v.C0
				a1.CFrame = v.C1
				a0.Parent = v.Part0
				a1.Parent = v.Part1

				v.Part0.CanCollide = true
				v.Part1.CanCollide = true

				local b = Instance.new("BallSocketConstraint")
				b.Attachment0 = a0
				b.Attachment1 = a1
				b.Parent = v.Part0

				v.Enabled = false
			end
		end
		local force = Instance.new("LinearVelocity", targetHumanoid)
		force.MaxForce = Vector3.new(2,1.5,2) * math.huge
		local direction = (targetHumanoid.CFrame.Position - playerHumanoid.CFrame.Position).Unit
		force.VectorVelocity = (direction + Vector3.new(0,0.5,0)).Unit * 25

		local rotation = Instance.new("BodyAngularVelocity",targetHumanoid)
		rotation.AngularVelocity = Vector3.new(1,0.7,1) * math.pi * math.random(1.9,2.9)
		rotation.MaxTorque = Vector3.new(1.5,1.5,1.5) * math.huge
		rotation.P = 3600
		
		wait(0.35)

	end
	targetedplayer.HumanoidRootPart.CanCollide = false
end)

Most of these were copied

#12 
local velocity = Instance.new("BodyVelocity",hit.Parent.HumanoidRootPart)
		velocity.MaxForce = Vector3.new(3,3,3) * math.huge
		local dir = (hit.Parent.HumanoidRootPart.CFrame.Position - script.Parent.Parent.HumanoidRootPart.Position).Unit
		velocity.Velocity = (dir + Vector3.new(0,1,0)).Unit *script.Parent.Configuration.Power.Value

		local rot = Instance.new("BodyAngularVelocity",hit.Parent.HumanoidRootPart)
		rot.AngularVelocity = Vector3.new(1,2,1) * math.pi *5
		rot.MaxTorque = Vector3.new(2,5,2) *math.huge
		rot.P = 5000

		game:GetService("Debris"):AddItem(velocity, 0.5)
		game:GetService("Debris"):AddItem(rot,0.5)
		wait(0.8)
3 Likes
#13

It works, but how do I make the targeted character ragdoll?

#14

Nevermind, I figured it out, thank you!

#15

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