Laser dot pointer

[damirandos]

how can i make a laser pointer making dot, that collide on object?
like this

[WarnFromPlayer (blitz)]

For the lasers you could use ray casting which is an easy method to make a laser

[lgotanintendoswitch (isle)]

For this you could either use a loop and cast a ray repeatedly and use a part thats size is the same as the rays magnitude, or you could use a beam and set the attachments position to either the mouse or a ray.

[NoxhazeI (John_Wick)]

Let’s say that you have a laser pointer emitter, i.e from where the laser will emit then you will use workspace:Raycast() to cast a ray.

Assuming that the front of the part is where you want the pointer to go. So:

local originPart = -- OriginPart
local endAttachment = -- The end attachment for the beam.
local distance = 2048 -- How far the laser can go. Don't use math.huge as it can break the raycasts.
local Params = RaycastParams.new()
Params.FilterDescendentInstances = {Gun}

local function RecalculatePosition()
   local ray = workspace:Raycast(originPart.Position,originPart.CFrame.LookVector*distance,Params)
   local endPosition = ray and ray.Position or 
   originPart.Position+originPart.CFrame.LookVector*distance
   endAttachment.WorldPosition = endPosition
end

originPart.Changed:Connect(RecalculatePosition)

[damirandos]

i found tutorial to raycasting and my script worked, but when i move dot subject like wall, dot doesn’t move forward.
robloxapp-20240319-1618389.wmv (817.9 KB)

	local param = RaycastParams.new()
	local att1 = script.Parent.Attachment
	local att2 = script.Parent.Attachment1

	while true do
		wait()
	local ray = game.Workspace:Raycast(script.Parent.Position, att2.CFrame.LookVector*15000, param)
	if ray then
		att2.Position = ray.Position - script.Parent.Position
	end
	end

[NoxhazeI (John_Wick)]

@damirandos

	local param = RaycastParams.new()
	local att1 = script.Parent.Attachment
	local att2 = script.Parent.Attachment1

	while true do
		wait()
	local ray = game.Workspace:Raycast(script.Parent.Position, att2.CFrame.LookVector*15000, param)
	if ray then -- "if ray then" means that if ray exists then the at will change position and it is obvious in your test that when the block is removed the ray becomes nil.
		att2.Position = ray.Position - script.Parent.Position
	end
	end

local param = RaycastParams.new()
local att1 = script.Parent.Attachment
local att2 = script.Parent.Attachment1

while true do
	wait()
	local ray = game.Workspace:Raycast(script.Parent.Position, att2.CFrame.LookVector*15000, param)
	if ray then
		att2.Position = ray.Position - script.Parent.Position
	else
		att2.Position = att2.CFrame.LookVector*15000
	end
end

[damirandos]

Thank you very much, it worked!

[NoxhazeI (John_Wick)]

No problem! If you have any other issue you can always ask me.

[Sleazel (Malcolm)]

For some reason I read the title Laser dot PRINTER. I need coffee.