ApplyImpulse Not working

Help and Feedback Scripting Support
#1

I’m trying to make a wall jump system that’s mostly on the client. I’m firing a remoteEvent to applyImpulse to the player’s HumanoidRootPart.

Client
function wallJump()
	exitingWall = true
	exitingWallTimer = exitingWallTime
	local wallNormal = nil

	if rightWallHit ~= nil then
		wallNormal = rightWallHit.Normal
	elseif leftWallHit ~= nil then
		wallNormal = leftWallHit.Normal
	end

	if wallNormal ~= nil then
		local forceToApply = hrp.CFrame.UpVector * wallJumpUpForce + wallNormal * wallJumpSideForce

		events.ModifyAssemblyLinearVelocity:FireServer(hrp, Vector3.new(hrp.AssemblyLinearVelocity.X, 0, hrp.AssemblyLinearVelocity.Z))
		events.ApplyImpulseToAssembly:FireServer(hrp, forceToApply)
		print("Wall Jump Applied with Force: ", forceToApply)
	end
end

Server
local events = game.ReplicatedStorage:WaitForChild("Events")

-- Function to apply impulse to the character's Assembly part
function applyImpulseToAssembly(setter, assemblyPart, impulseForce)
	-- Check if the assemblyPart and impulseForce are valid
	if assemblyPart and assemblyPart:IsA("BasePart") and impulseForce then
		-- Print debug information to verify correct force application
		print("Server received ApplyImpulse event.")
		print("Impulse Force:", impulseForce)

		-- Ensure that the assemblyPart belongs to the player
		local character = setter.Character
		if  assemblyPart:IsDescendantOf(character) then
			assemblyPart:ApplyImpulse(impulseForce)
		else
			warn("Invalid assemblyPart for player: ", setter)
		end
	else
		warn("Invalid parameters passed to ApplyImpulseToAssembly.")
	end
end

-- Function to modify the assembly's linear velocity
function modifyAssemblyLinearVelocity(setter, assemblyPart, assemblyVector3)
	if assemblyPart and assemblyPart:IsA("BasePart") and assemblyVector3 then
		print("Server received ModifyAssemblyLinearVelocity event.")
		print("New Velocity Vector:", assemblyVector3)

		-- Ensure that the assemblyPart belongs to the player
		local character = setter.Character
		if character and assemblyPart:IsDescendantOf(character) then
			assemblyPart.AssemblyLinearVelocity = assemblyVector3
		else
			warn("Invalid assemblyPart for player: ", setter)
		end
	else
		warn("Invalid parameters passed to ModifyAssemblyLinearVelocity.")
	end
end

-- Connect the server functions to the events
events.ApplyImpulseToAssembly.OnServerEvent:Connect(applyImpulseToAssembly)
events.ModifyAssemblyLinearVelocity.OnServerEvent:Connect(modifyAssemblyLinearVelocity)

I’ve looked for solutions online but none of them are helping. Any help would greatly be appreciated!

#2

It seems as that you aren’t passing through the impulseForce.

The client seems to send 2 arguments.
events.ApplyImpulseToAssembly:FireServer(hrp, forceToApply)

While the function seems to take 3 arguments, which is missing the #3 argument.
function applyImpulseToAssembly(setter, assemblyPart, impulseForce)

#3

No, b/c when clients fire a remoteEvent, the first argument is the client who fired it

#4

Oh, that’s my bad. I didn’t know setter was a Player.

1 Like
#5

You’re having an NetworkOwnership issue; Your character model has a NetworkOwner of the client by default and so when you call

-- ServerSide
if  assemblyPart:IsDescendantOf(character) then
	-- assemblyPart has a NetworkOwnership of Client
	assemblyPart:ApplyImpulse(impulseForce) -- Server tries to Apply an Impulse; This doesn't pass thru the Server-Client boundary and thus the client never see's this
	-- Client then Updates the server physics for the character, and never includes your Impulse because it never saw it
else
	warn("Invalid assemblyPart for player: ", setter)
end

If you apply the impulse on the client side your code will work exactly as intended

Alternatively you can override this by

Character:SetNetworkOwner(nil) -- Forcing the server to take NetworkOwnership

The Client-Server boundary is probably why this worked just fine for everything that wasn’t your character.

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#6

Thank you so much! It’s working now

1 Like