How to make player take damage when touch ray?

[justhazu (hazu)]

My idea for this is create a part above player head then cast ray from that part like in this beautiful drawing

This is my script

–Create a part above player head
local hitbox = game.ReplicatedStorage.KiroDF.Hitbox:Clone()
hitbox.Parent = plr.Character.UpperTorso
hitbox.CFrame = wind1.CFrame * CFrame.new(0,30,0)

–Cast a ray from that part
local ray = Ray.new(hitbox.Position, Vector3.new(0,-100,0))

	while wait() do
		if plr.Character.UpperTorso:FindFirstChild("Hitbox") then
			local hit, position = game.Workspace:FindPartOnRayWithIgnoreList(ray , {hitbox})				
			if hit and hit.Parent:FindFirstChild("Humanoid") and hit.Parent:FindFirstChild("Humanoid").Health > 0 then
			hit.Parent.Humanoid:TakeDamage(25)
			end
		else
			break
			end
	end

no error but nothing happened
pls help
thx

[JackscarIitt (Jackscarlett)]

@justhazu

local hit, position = game.Workspace:FindPartOnRayWithIgnoreList(ray , {hitbox})

FindPartOnRayWithIgnoreList is deprecated, try not to use that (Use the RayCast result & RaycastParams instead)

Try this script?

–Create a part above player head
local hitbox = game.ReplicatedStorage.KiroDF.Hitbox:Clone()
hitbox.Parent = plr.Character.UpperTorso
hitbox.CFrame = wind1.CFrame * CFrame.new(0,30,0)

local raycastParams = RaycastParams.new()
raycastParams.FilterType = Enum.RaycastFilterType.Blacklist
raycastParams.FilterDescendantsInstances = {hitbox}

local Direction = hitbox.CFrame.LookVector * 50

–Cast a ray from that part
while wait() do
    if plr.Character.UpperTorso:FindFirstChild("Hitbox") then
        local RayResult = workspace:RayCast(hitbox.Position, Direction, raycastParams)
    
        if RayResult then
            print("Part result hit: "..RayResult.Instance)
            local HitPart = RayResult.Instance
            local Model = HitPart.Parent
            if Model:FindFirstChild("Humanoid") and Model.Humanoid.Health > 0 then
                Model.Humanoid:TakeDamage(25)
                print("Damage activated")
            end
        else
            print("No result found")
        end
    else
        break
    end
end

[Operatik]

I think you’re trying to fire rays from the entire surface on the part rather than from a point. To do this, you’ll have to use part.Size.X and part.Size.Z to randomly determine a random position below the part’s surface. Note that parts which are slightly angled may have to use a little more complicated method.

Random position on BottomSurface

local randomPosition = hitbox.Position * Vector3.new(math.random(-hitbox.Size.X / 2, hitbox.Size.X / 2), -hitbox.Size.Y, math.random(-hitbox.Size.Z / 2, hitbox.Size.Z / 2))

[justhazu (hazu)]

error : RayCast is not a valid member of Workspace"Workspace"
at this line : local RayResult = workspace:RayCast(hitbox.Position, Direction, raycastParams)

[EmbatTheHybrid (Embat)]

Change RayCast to Raycast as it’s case sensitive

[justhazu (hazu)]

it’s not detecting humanoid, is there any way to visualize ray?

[EmbatTheHybrid (Embat)]

Is the part above you? I think direction has to be

local Direction = hitbox.CFrame.UpVector * 50

So it raycasts upward, And if you want to visualise a ray, just refer to this

How do I visualize a ray?

OP likely wants to see the ray while testing the project. Rays can come in different origins and directions. @OP you can create a very thin part, position it at the origin of the ray. Have it look at the position, then offset it, because if you just position it at the origin of the ray it will be in the middle. local r = Ray.new(origin, direction) local _, position = workspace:FindPartOnRay(r) local distance = (origin - position).Magnitude local p = Instance.new("Part") p.Anchored = true p.Can…

[justhazu (hazu)]

The only problem now is the ray keep detecting accesories (my english broken(or broke?))

[EmbatTheHybrid (Embat)]

I think you hae to filter yourself as well

change

raycastParams.FilterDescendantsInstances = {hitbox}

To

raycastParams.FilterDescendantsInstances = {plr.Character}

So it wont detect you as well, least that’s what I think is needed

Please correct me if you don’t want yourself to be excluded from the Raycasy

[justhazu (hazu)]

I want myself to be excluded from the raycast but now it’s not detect any humanoid

     while wait() do
            			if plr.Character.UpperTorso:FindFirstChild("Hitbox") then
            				local RayResult = workspace:Raycast(hitbox.Position, Direction, raycastParams)

            				if RayResult then
            					print(RayResult.Instance.Parent.Name)
  --when ray cast it will print "Workspace"
                                                print(RayResult.Instance.Parent.Name)
  --when ray cast it will print "Part"
            					if RayResult.Instance.Parent:FindFirstChild("Humanoid") and RayResult.Instance.Parent.Humanoid.Health > 0 then
            						RayResult.Instance.Parent.Humanoid:TakeDamage(25)
            						print("Damage activated")
            					end
            				else
            					print("No result found")
            				end
            			else
            				break
            			end
            			end

[EmbatTheHybrid (Embat)]

I think you need to visualize the Raycast so we can see what’s happening exactly

[justhazu (hazu)]

ray damage work fine when i remove my accesories so I just need to filter all of the accessories in this line

raycastParams.FilterDescendantsInstances = {hitbox}

but idk how to do that

[EmbatTheHybrid (Embat)]

@justhazu

raycastParams.FilterDescendantsInstances = {hitbox}

Maybe try

raycastParams.FilterDescendantInstances = {hitbox, plr.Character.Humanoid:GetAccessories()}

[justhazu (hazu)]

It stop detecting my accessories but how to do the same thing with npc/other player accessories?

[justhazu (hazu)]

error : attempt to index nil with ‘GetAccessories’ (there are end for ‘for i, v…’ above these lines)

        for i ,v in pairs(game.Workspace:GetChildren()) do
        			local huma = v:FindFirstChild("Humanoid")					
        		
        		local raycastParams = RaycastParams.new()
        		raycastParams.FilterType = Enum.RaycastFilterType.Blacklist
        			raycastParams.FilterDescendantsInstances = {plr.Character, hitbox, huma:GetAccessories()}

[justhazu (hazu)]

not detect anything

  local randomPosition = hitbox.Position * Vector3.new(math.random(-hitbox.Size.X / 2, hitbox.Size.X / 2), -hitbox.Size.Y, math.random(-hitbox.Size.Z / 2, hitbox.Size.Z / 2))
    local RayResult = workspace:Raycast(randomPosition, Vector3.new(0,-200,0), raycastParams)

[Operatik]

The second argument is not correct, apparently? You’re supposed to use the original position multiplied by a vector that is 200 studs below it.

[justhazu (hazu)]

thx for helping me the only problem left is I can’t find npc’s humanoid in ray.

I tested

print(RayResult.Instance.Parent.Name)
--and
print(RayResult.Instance.Name)				

result : https://gyazo.com/7a8138b4fc891b1b0ac26d2e98a93475

entire raycasting script

    local hitbox = game.ReplicatedStorage.KiroDF.Hitbox:Clone()
    		hitbox.Parent = plr.Character.UpperTorso
    		hitbox.CFrame = wind1.CFrame * CFrame.new(0,30,0)
    		
    		for i ,v in pairs(game.Workspace:GetChildren()) do
    			local huma = v:FindFirstChild("Humanoid")
    			if huma then
    				local ac = v.Humanoid:GetAccessories()
    			
    		local raycastParams = RaycastParams.new()
    		raycastParams.FilterType = Enum.RaycastFilterType.Blacklist			
    		raycastParams.FilterDescendantsInstances = {hitbox, ac, plr.Character}
    		while wait() do
    			if plr.Character.UpperTorso:FindFirstChild("Hitbox") then
    				local VCharacter = game.Workspace:FindFirstChild(plr.Name)
    				local vPlayer = game.Players:GetPlayerFromCharacter(VCharacter)
    				local randomPosition = hitbox.Position + Vector3.new(math.random(-hitbox.Size.X / 2, hitbox.Size.X / 2), -hitbox.Size.Y, math.random(-hitbox.Size.Z / 2, hitbox.Size.Z / 2))
    				local RayResult = workspace:Raycast(randomPosition, hitbox.Position * Vector3.new(0,-200,0), raycastParams)			
    				
    				if RayResult then						
    					print("test1 : "..RayResult.Instance.Parent.Name)
    					print("test2 : "..RayResult.Instance.Name)							
    					if RayResult.Instance.Parent.Parent:FindFirstChild("Humanoid") and not RayResult.Instance.Parent.Parent:FindFirstChild("CheckSmash")then						
    						local check = Instance.new("BoolValue")
    						check.Name = "CheckSmash"
    						check.Parent = RayResult.Instance.Parent.Parent
    						game.Debris:AddItem(check, 0.5)
    						tagEnemy(RayResult.Instance.Parent.Parent:FindFirstChild("Humanoid"),vPlayer)
    						RayResult.Instance.Parent.Parent.Humanoid:TakeDamage(25)	
    						wait(0.05)
    						untagEnemy(RayResult.Instance.Parent.Parent:FindFirstChild("Humanoid"))	
    						print("damagedone")
    					end				
    				end
    			else
    					break
    					end
    				end
    			end
    		end

[Operatik]

@justhazu

game.Workspace:GetChildren()

Questionable about its efficiency when I already saw this line. Be careful with that.

---

On another note, try creating a random part with position as the randomPosition that lasts long enough to be seen and analyzed.

[justhazu (hazu)]

@justhazu

game.Workspace:GetChildren()

I use this line to detect all accessories in workspace do i have to fix something?