Realistic Fall/Impact Damage

[fr3akko (noah)]

Hello!

I’ve recently started developing a combat game and making a fall damage system was the hardest part so far. I’ve went for a pretty weird approach where each limb takes damage using .Touched() depending on rootpart velocity. It works pretty much fine and has relatively low data usage. The problem is sliding on walls will still damage the limbs. I was wondering if there was any way to combat this?

Video showcasing the issue:

Server-side functions that handle fall damage:

-- ragdolls the player around 1 second after they start falling ( really messy due to .Landed not always firing on the server )
utility.ConnectFallRagdoll = function(char: Model?)
	local humanoid: Humanoid = char:FindFirstChildOfClass("Humanoid")
	local rootPart: BasePart = char:FindFirstChild("HumanoidRootPart")
	local head: BasePart = char:FindFirstChild("Head")

	local fallThread: thread

	humanoid.StateChanged:Connect(function(old, new)
		if new == Enum.HumanoidStateType.Freefall then
			if fallThread ~= nil then return end
			
			fallThread = task.delay(1, function()
				repeat task.wait(0.05) until rootPart.AssemblyLinearVelocity.Y < -50
				
				humanoid:SetAttribute("IsRagdolled", true)
				
				PlaySound(GetRandomChild(RS.Assets.Sounds.Pain.Critical), head:FindFirstChild("Voice"))
				
				repeat task.wait() until rootPart.AssemblyLinearVelocity.Magnitude <= 5
				
				task.wait(1)
				
				if humanoid.Health <= 0 then return end
				
				humanoid:SetAttribute("IsRagdolled", false)
			end)
		end
		
		if new == Enum.HumanoidStateType.Landed or new == Enum.HumanoidStateType.Running then
			if fallThread then task.cancel(fallThread); fallThread = nil end
			
			task.wait(1)
			
			if humanoid.Health <= 0 then return end
			
			humanoid:SetAttribute("IsRagdolled", false)
		end
	end)
end

-- this handles limb damage on touched
utility.ConnectLimbRagdollDamage = function(char: Model?)
	local humanoid: Humanoid = char:FindFirstChildOfClass("Humanoid")
	local rootPart: BasePart = char:FindFirstChild("HumanoidRootPart")
	local limbHealth: Configuration = char:FindFirstChild("LimbHealth")
	
	for _, limbHealthValue: DoubleConstrainedValue in limbHealth:GetChildren() do
		local limbPart: BasePart = char:FindFirstChild(limbHealthValue.Name)
		if not limbPart then continue end
		
		local cooldown = false
		
		limbPart.Touched:Connect(function(otherPart) 
			if otherPart:IsDescendantOf(char) then return end

			if humanoid:GetAttribute("IsRagdolled") == true then
				local velocity = rootPart.AssemblyLinearVelocity.Magnitude
				if velocity <= 20 then return end
				
				cooldown = true
				
				limbHealthValue.Value -= velocity
				
				task.wait(0.5)
				
				cooldown = false
			end
		end)
	end
end

[HelperKepler (Rintaro)]

You could use raycasting by repeatedly checking if a part is underneath the player.

params.FilterType=Enum.RaycastFilterType.Exclude
params.FilterDescendantsInstances={character}

while task.wait() do
	if root_part.AssemblyLinearVelocity.Magnitude>=AmountYouWant then
		local raycast=workspace:Raycast(root_part.Position,Vector3.new(0,-6,0),params)
		
		if raycast and raycast.Instance:IsA('BasePart') then
			
			print('landed')
			
		elseif not raycast then
			
			print('in air')
			
		end
	end
end

[teodormihai1 (chickenman66)]

You could use raycasting and check every face of the character to see if they are directly “hugging” anything, this approach works well but im not sure if its a good approach and what other issues might appear

local RC_P = RaycastParams.new()

local function CheckWallHuggingCheaters(rootPart : BasePart)
      local dir = rootPart.CFrame.LookVector
      local origin = rootPart.Position
      RC_P.FilterDescendantsInstances = {rootPart.Parent}
      RC_P.FilterType = Enum.RaycastFilterType.Exclude

      local wallRaycast = workspace:Raycast(origin, dir * 1.2, RC_P)

      if wallRaycast == nil then
            return true
      elseif wallRaycast ~= nil then
            if wallRaycast.Instance and wallRaycast.Instance.CanTouch == false or wallRaycast.Instance.CanCollide == false then
                  return true
            else
                  return false
            end
      end
end

[fr3akko (noah)]

i want to keep the ability for the player’s limbs to take damage upon hitting any surface, not just the floor. So, lets say, if they flew into a wall on high speeds they would still take damage.

[Dragon_Trance]

You could check for sudden velocity changes instead, using a physics loop instead of touch signals

[HelperKepler (Rintaro)]

How about changing the rays direction depending on the players movement? So lets say if the player is hit to the left, the ray will point leftwards, etc.