[SOL] Trouble with Raycast visualization (Raycast reflection)

So I’ve made a raycasting system for my laser guns. I’ve recently inserted a ray-reflection system at end of the function.

Raycasting + server’s visualize:

local RStorage = game.ReplicatedStorage

function castRay(plr: Player, origin: Vector3, dirRaw: CFrame, rFilters: {Instances}, laserProps: {}, canBackfire: boolean)
	local cosmets = laserProps["cosmetics"]
	local dmeter = cosmets["dmeter"]
	local direction = dirRaw.LookVector
	direction *= laserProps["range"]
	local rParams = RaycastParams.new()
	rParams.FilterType = Enum.RaycastFilterType.Exclude
	rParams.FilterDescendantsInstances = rFilters
	rParams.IgnoreWater = true
	local hitReflect = false
	local rResult = workspace:Raycast(origin, direction, rParams)
	local rayDist
	if rResult then
		rayDist = rResult.Distance
		local hit = rResult.Instance
		if hit:GetAttribute("Reflective") then
			hitReflect = true
			searchHumanoidHP(plr, hit, laserProps, true)
			cosmets["rayLength"] = rayDist
------\\ SERVER VISUALIZATION \\---------------------------------------------------------------------------------
	local beam = RStorage["LaserBeam"]:Clone()
	if rayDist then	beam.Size = Vector3.new(dmeter, dmeter, rayDist)
	else beam.Size = Vector3.new(dmeter, dmeter, cosmets.rayLength) end
	if rayDist then	beam.CFrame = CFrame.lookAt(origin, origin + direction) * CFrame.new(0, 0, -rayDist/2)
	else beam.CFrame = CFrame.lookAt(origin, origin + direction) * CFrame.new(0, 0, -beam.Size.Z/2) end
	beam.Parent = workspace.MouseIgnore
	Debris:AddItem(beam, 5)

------\\ SERVER TO CLIENT \\---------------------------------------------------------------------------------------
	RStorage.BeamReplicate:FireAllClients(dirRaw, cosmets) -- Send to client to replicate.

-------\\ RAY REFLECTION \\-----------------------------------------------------------------------------------------
	if hitReflect == true then
		laserProps["range"] -= rayDist
		if laserProps["range"] <= 0 then return end
		cosmets["rayLength"] = laserProps["range"]

		-- Formula:	r = d - 2(d ⋅ n)n
		-- Code:	r = d - (2 * d:Dot(n) * n)
		local newOrigin = rResult.Position
		local rNormal = rResult.Normal
		local reflectNormal = direction - (2 * direction:Dot(rNormal) * rNormal)
		local reflectCF = CFrame.lookAt(newOrigin, rResult.Position + reflectNormal)
		castRay(plr, newOrigin, reflectCF, {}, laserProps, true)



The ray-reflection only applies if the hit part has the attribute "Reflective", and will recall the function over and over again to reflect as long as it has the said attribute.

Client’s visualization:

RStorage.BeamReplicate.OnClientEvent:Connect(function(cF, cosmets)
	local dmeter = cosmets["dmeter"]
	local rayLength = cosmets["rayLength"]
	local laser = RStorage["LaserBeam"]:Clone()
	laser.Size = Vector3.new(dmeter, dmeter, rayLength)
	laser.CFrame = cF * CFrame.new(0, 0, -rayLength/2)
	laser.Parent = workspace.MouseIgnore
	Debris:AddItem(laser, 0.5)

The SERVER VISUALIZATION thread and client’s version is not far so different.


The main issue here is with visualizing the raycast when it reflects. I use this part called “LaserBeam” from the ReplicatedStorage. The Z-axis of the size is derived from the rayDist, if not, then the rayLength.
There are 3 variables that are used for the Z-axis:

  1. laserProps["range"]Basically max distance of the laser/raycast.
  2. laserProps.cosmets["rayLength"]The one used for the client-sided visualization.
  3. rayDistDerived from rResult(RaycastResult).

Here is a drawing of the visualization results:
devforum issue 2a

Hitting more Attribute"Reflective" parts:
devforum issue 2b

The LaserBeam(s) seems to position their start point on their previous hit position, but their size seems to exceed the rayDist?

And lasst problem here is, I’ve messed tzoo much with positioning these lines of codes and my brain is having a blackout.

Feedbacks are wanted. Ask me if there’s some I did not explain.
Here’s the reflection formula I got from:

Thank you for reading :slightly_smiling_face:

:slightly_smiling_face: All it needed was to change from this:

if rayResult then		
		if REFLECTIVE then
			hitReflect = true
			searchHumanoidHP(plr, rayInstance, laserProps, true)
			cosmets["rayLength"] = rayDistance

To this:

if rayResult then
		if REFLECTIVE then
			hitReflect = true
			searchHumanoidHP(plr, rayInstance, laserProps, true)
		cosmets["rayLength"] = rayDistance

Case closed.

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