How to set max distance on a raycast?

[Frondoodle2 (frondoodle)]

Hello, i am trying to figure out how to make a max distance for a raycast, say the distance is set to 30 studs. Any time the raycast is hit to anywhere <30 studs from the player, it will work, but >30 will not work. Heres my code

local plr = game.Players.LocalPlayer
local char = plr.Character or plr.CharacterAdded:Wait()
local val: BoolValue = char:WaitForChild("unstunned")
local tool = script.Parent
local event = script:WaitForChild("Fire")
local cd = false
local cdTime = 5
local equipped = false
local objectFound = false
local selectedHighlight = Instance.new("Highlight")
selectedHighlight.Parent = workspace.Fx
selectedHighlight.FillColor = Color3.new(255,255,255)
local enemy = nil

tool.Activated:Connect(function()
	if cd == false and val.Value == true and script.isSelected.Value == true and workspace.globalCooldowns.InfiniteVoid.Value == false and char.Meter.Value == 100 then
		cd = true
		
		event:FireServer(enemy)
		
		wait(cdTime)
		cd = false
	end
	
end)



function mouseRayCast()
	local mousePos = game:GetService("UserInputService"):GetMouseLocation()
	local mouseRay = workspace.CurrentCamera:ViewportPointToRay(mousePos.X, mousePos.Y)
	local rayParams = RaycastParams.new()
	rayParams.FilterDescendantsInstances = {plr.Character}
	rayParams.FilterType = Enum.RaycastFilterType.Exclude
	local rayResult = workspace:Raycast(mouseRay.Origin, mouseRay.Direction * 100000, rayParams)
	
	
	return rayResult
end


tool.Equipped:Connect(function()
	if equipped == false then
	equipped = true
	end


while true do
	if equipped == false then return end
	
		local beam = mouseRayCast()
	if not beam then
		objectFound = false
	else
		objectFound = true
	end

if beam.Instance.Parent:FindFirstChild("Humanoid") and objectFound == true then
	script.isSelected.Value = true
	selectedHighlight.Adornee = beam.Instance.Parent
			enemy = beam.Instance.Parent
else
	script.isSelected.Value = false
	selectedHighlight.Adornee = nil
			enemy = nil
	
end
task.wait()
end

end)

tool.Unequipped:Connect(function()
	if equipped == true then
	equipped = false
	selectedHighlight.Adornee = nil
	script.isSelected.Value = false
	end
end)

If anyone helps, that will be greatly appreciated! Thanks!

[SomeFedoraGuy (octav)]

@Frondoodle2

100000

Just set this to 30.