Physics State type bug

[MajesticUltraCow (Majestic)]

You can write your topic however you want, but you need to answer these questions:

1. What do you want to achieve?
   I’m making a game where you can launch yourself with a shotgun in a direction and you will travel in an arc. Currently I’m just changing the humanoidstatetype to physics and then using a body velocity to launch the character and then quickly deleting the body velocity.

2. What is the issue?
   If I launch myself into a corner, my character will just fling. I have no code that is causing it to happen so I’m assuming this is just a bug with the physics state type.

As you can see in the video, the character flies in an arc as intended but as soon as I launch myself into a corner, sometimes the character will just start accelerating to the left.

Here is my firing method to show that the only velocity I’m adding to the character is the bodyvelocity which instantly gets deleted.

function module:Fire()
	if not self:CanFire() then return end
	self.Bullets -= 1
	local t = tick()
	self.LastShot = t
	local self:module = self
	local hum:Humanoid = self.Humanoid
	hum.WalkSpeed = 0
	
	local dir = (self.HRP.Position - self.MousePos).Unit
	local bv = Instance.new("BodyVelocity", self.HRP)
	bv.MaxForce = Vector3.new(1000000,1000000)
	bv.Velocity = dir * 70
	ds:AddItem(bv, 0.1)
	
	task.wait()
	hum:ChangeState(Enum.HumanoidStateType.Physics)
	local running = true
	
	local params = RaycastParams.new()
	params.FilterDescendantsInstances = {self.Character}
	params.FilterType = Enum.RaycastFilterType.Exclude
	
	task.delay(0.05,function()
		hum.WalkSpeed = 16
	end)
	if dir.Y > 0.2 then
		task.wait(0.1)
	end
	
	local c
	task.delay(1,function()
		if running and self.LastShot == t then
			hum:ChangeState(Enum.HumanoidStateType.GettingUp)
		end
	end)
	
	local lastVelocity = self.HRP.AssemblyLinearVelocity
	c = run.RenderStepped:Connect(function()
		if self.LastShot ~= t then
			c:Disconnect()
			return
		end
		local rdir = self.HRP.AssemblyLinearVelocity.Unit
		local ray = workspace:Raycast(self.HRP.Position - rdir * 2, rdir * 6, params)
		local ray2 = workspace:Raycast(self.HRP.Position+Vector3.yAxis, Vector3.yAxis * -5, params)
		local ray3 = workspace:Raycast(self.HRP.Position, Vector3.yAxis * -4, params)
		if ray2 or ray3 then
			self:Reload()
			running = false
			c:Disconnect()
			hum:ChangeState(Enum.HumanoidStateType.GettingUp)
		end
		
		if ray then
			hum:ChangeState(Enum.HumanoidStateType.GettingUp)
		end
	end)
	
	local c2
	c2 = hum.StateChanged:Connect(function(old, new)
		if new == Enum.HumanoidStateType.Landed then
			c2:Disconnect()
			self:Reload()
		end
	end)
end

3. What solutions have you tried so far?
   I’ve tried manually checking for if the character gets flung by doing this but it doesn’t work perfectly and sometimes triggers when I’m just launching normally.

local hum:Humanoid = script.Parent:WaitForChild("Humanoid")
local hrp:BasePart = script.Parent:WaitForChild("HumanoidRootPart")

local lastVelocity = hrp.AssemblyLinearVelocity 
local lastState = hum:GetState()
while task.wait() do
	local currentVelocity = hrp.AssemblyLinearVelocity 
	local currentState = hum:GetState()
	if currentState == Enum.HumanoidStateType.Physics and lastState == Enum.HumanoidStateType.Physics then
		if currentVelocity.Y - lastVelocity.Y > 5 then
			hum:ChangeState(Enum.HumanoidStateType.GettingUp)
		elseif math.abs(currentVelocity.X - lastVelocity.X) > 3 then
			hum:ChangeState(Enum.HumanoidStateType.GettingUp)
		end
	end
	
	lastState = currentState
	lastVelocity = currentVelocity
end

Again, I am absolutely convinced that this is just a physics bug but I’m not sure atp.

[alonefact (Jann)]

I’m pretty sure this is because the shotgun you’re holding has mass.

Make every part of it massless.

If this doesn’t work, can you send another video of yourself launching in the other direction as well?

[MajesticUltraCow (Majestic)]

I was so sure I turned it off. Thank you so much that was definitely the issue!