How can I make a Laser Pointer

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#1
  1. What do I want to achieve? I want to make it to rotate automatically according to the part where’s the rays hit. basically, Laser Pointer using raycasting
  2. What is the issue?
    Image)
1 Like
#3

try this

local function CreateLazer(StartPoint : Vector3, EndPoint : Vector3)
	if not StartPoint or not EndPoint then return end
	
	local Distance = (StartPoint - EndPoint).Magnitude
	local Bullet = Instance.new("Part")
	Bullet.CastShadow = false
	Bullet.CanCollide = false
	Bullet.Anchored = true
	Bullet.Size = Vector3.new(0.1, 0.1, Distance)
	Bullet.CFrame = CFrame.new(StartPoint, EndPoint) * CFrame.new(0, 0, -Distance / 2)
	Bullet.Parent = workspace
end
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#4

I made a similar script before. How should I go about doing this? - #17 by Kaid3n22

#5

didn’t worked

ignore this : Post must be at least characters

#6

Well, did you replace what the variable “blood” referenced? And I’m assuming you changed the variable name as well, correct?

#7

I didn’t i just use the same concept as used in that. it rotates but it doesn’t seems to be rotate the y-axis on cylinder

#8

Here, I changed it a bit to rotate properly:

local blood = workspace.Blood

local rpm = RaycastParams.new()
rpm.FilterType = Enum.RaycastFilterType.Blacklist
rpm.FilterDescendantsInstances = {blood}

local raycasts = {}

for i = -1, 1, 2 do
	table.insert(raycasts, workspace:Raycast(blood.Position,Vector3.new(0, 0, i)*5, rpm))
	table.insert(raycasts, workspace:Raycast(blood.Position,Vector3.new(i, 0, 0)*5, rpm))
	table.insert(raycasts, workspace:Raycast(blood.Position,Vector3.new(0, i, 0)*5, rpm))
end

local closest
local closestmag = math.huge

for i,v in pairs(raycasts) do
	if v then
		if closestmag > (blood.Position-v.Position).Magnitude then
			closest = v
			closestmag = (blood.Position-v.Position).Magnitude
		end
	end
end

if closest then
	blood.CFrame = CFrame.lookAt(blood.Position, closest.Position) * CFrame.Angles(math.rad(0),math.rad(90),math.rad(0))	
end
#9

Screenshot (5)
Screenshot (6)
didn’t worked with 90 but seems like 180 might be

#10

I’m not sure why 90 didn’t work, it worked for me. Could you show me what it looked like before adding the rotation bit?

#11

without Rotation
Screenshot (8)

by the way didn’t worked with 180 either

#12

Try using a different angle:

blood.CFrame = CFrame.lookAt(blood.Position, closest.Position) * CFrame.Angles(math.rad(0),math.rad(0),math.rad(90))

or

blood.CFrame = CFrame.lookAt(blood.Position, closest.Position) * CFrame.Angles(math.rad(90),math.rad(0),math.rad(0))
#13

didn’t worked either
ignore this : Post must be at least characters

#14

could you provide me the laser you are using for this?

#15 
local plr = plrs.LocalPlayer
local mouse = plr:GetMouse()
local chr = plr.Character or plr.CharacterAdded:Wait()
local POS = game.ReplicatedStorage.POS:Clone()
POS.Parent = workspace

while task.wait() do
	local rayprayms = RaycastParams.new()
	rayprayms.FilterType = Enum.RaycastFilterType.Blacklist
	rayprayms.FilterDescendantsInstances = {chr}
	local pos = script.Parent.Handle.Position
	local ray = workspace:Raycast(pos, (mouse.Hit.Position-pos)*1.1, rayprayms)
	if ray then
		POS = game.ReplicatedStorage.POS:Clone()
		POS.Parent = workspace
		print(ray.Distance)
		--POS.Orientation = ray.Instance.Orientation*2
		POS.Position = ray.Position
		POS.CFrame = CFrame.lookAt(POS.Position, chr:FindFirstChild("HumanoidRootPart").Position)* CFrame.Angles(math.rad(90),math.rad(0),math.rad(-0))	
	end
end
#16

Could you send the POS model/cylinder so I can see/check why this won’t rotate properly?

#17

POS.rbxm (2.3 KB)

#18

Ok, actually, I didn’t need the model. The problem is that you are having it look towards the HumanoidRootPart.

local plr = plrs.LocalPlayer
local mouse = plr:GetMouse()
local chr = plr.Character or plr.CharacterAdded:Wait()
local POS = game.ReplicatedStorage.POS:Clone()
POS.Parent = workspace

while task.wait() do
	local rayprayms = RaycastParams.new()
	rayprayms.FilterType = Enum.RaycastFilterType.Blacklist
	rayprayms.FilterDescendantsInstances = {chr}
	local pos = script.Parent.Handle.Position
	local ray = workspace:Raycast(pos, (mouse.Hit.Position-Vector3.new(0,-1,0)).Unit*1.1, rayprayms)
	if ray then
		POS = game.ReplicatedStorage.POS:Clone()
		POS.Parent = workspace
		POS.Position = ray.Position
		POS.CFrame = CFrame.lookAt(POS.Position, ray.Position) * CFrame.Angles(math.rad(90),math.rad(0),math.rad(-0))	
	end
end

Edit: I’m going to be going to sleep now, so I won’t be able to answer any further questions till I wake up.

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