[SOL] Trouble with Raycast visualization (Raycast reflection)

[DanishXDCPA (DanishThe)]

Hello,
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
		else
			searchHumanoidHP(plr, hit, laserProps, true)
			cosmets["rayLength"] = rayDist
		end
	end
	
------\\ 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)

	end

end

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)
	
end)

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

---

Issue

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. rayDist → Derived from rResult(RaycastResult).

Here is a drawing of the visualization results:

Hitting more Attribute"Reflective" parts:

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:

How to reflect rays on hit

Reflecting rays using raycasting Want bullets to ricochet? Lasers to bounce? Custom Pong game? Here’s a simple way to reflect a ray when it hits a surface using the surface normal returned by the Raycast method! Formula We will be working with this equation: r = d - 2(d ⋅ n)n Where r is the resultant reflection normal, d is the normal of our ray, and n is the surface normal that our ray hit (We will get n from the RaycastResult that the Raycast method returns). Because we are doing reflec…

Thank you for reading

[DanishXDCPA (DanishThe)]

All it needed was to change from this:

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

To this:

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

Case closed.