local GRAVITY = 120
local SPEED = 330
local MAX_RANGE = 2000
local TRAIL_POINTS = 25

local dt = 0.05
local maxT = 30

local params = RaycastParams.new()
params.FilterType = Enum.RaycastFilterType.Exclude

local marker = Instance.new("Part")
marker.Size = Vector3.new(5, 5, 5)
marker.Shape = Enum.PartType.Ball
marker.Anchored = true
marker.CanCollide = false
marker.CanQuery = false
marker.CanTouch = false
marker.Material = Enum.Material.Neon
marker.Color = Color3.new(1, 0, 0)
marker.Position = Vector3.new(0, 5000, 0)
marker.Parent = workspace

local hl = Instance.new("Highlight")
hl.FillColor = Color3.new(0, 1, 0.866667)
hl.OutlineColor = Color3.new(1, 0, 0)
hl.FillTransparency = 0.3
hl.Parent = marker

local trailFolder = Instance.new("Folder")
trailFolder.Name = "TrajectoryTrail"
trailFolder.Parent = workspace

local trailParts = {}
for i = 1, TRAIL_POINTS do
	local p = Instance.new("Part")
	p.Size = Vector3.new(2, 2, 2)
	p.Shape = Enum.PartType.Ball
	p.Anchored = true
	p.CanCollide = false
	p.CanQuery = false
	p.CanTouch = false
	p.Material = Enum.Material.Neon
	p.Transparency = i / TRAIL_POINTS * 0.7
	p.Color = Color3.fromHSV(0.5 - (i / TRAIL_POINTS) * 0.5, 1, 1)
	p.Position = Vector3.new(0, 5000, 0)
	p.Parent = trailFolder
	trailParts[i] = p
end

local player = game:GetService("Players").LocalPlayer
local env = getgenv()

local function hideTrail()
	for _, p in trailParts do
		p.Position = Vector3.new(0, 5000, 0)
	end
end

local connection
connection = game:GetService("RunService").Heartbeat:Connect(function()
	if env.stopplease then
		connection:Disconnect()
		marker:Destroy()
		trailFolder:Destroy()
		env.stopplease = nil
		return
	end

	local character = player.Character
	if not character then
		hideTrail()
		return
	end

	local control = character:FindFirstChild("Control")

	if control then
		local tank = control.CntrRig.Value
		if tank.Name == "Sturmtiger" then
			params.FilterDescendantsInstances = {tank}

			local barrel = tank.Movable.BarrelEnd
			local origin = barrel.Position
			local dir = barrel.CFrame.UpVector
			local v0 = dir * SPEED
			local lastPos = origin

			local impact = nil
			local impactT = nil

			for i = 1, maxT / dt do
				local t = i * dt
				local pos = Vector3.new(
					origin.X + v0.X * t,
					origin.Y + v0.Y * t - 0.5 * GRAVITY * t * t,
					origin.Z + v0.Z * t
				)

				local dist = (pos - origin).Magnitude
				if dist > MAX_RANGE then
					break
				end

				local ray = workspace:Raycast(lastPos, pos - lastPos, params)
				if ray then
					impact = ray.Position
					impactT = t
					break
				end

				lastPos = pos
			end

			if impact and impactT then
				for i = 1, TRAIL_POINTS do
					local t = (i / TRAIL_POINTS) * impactT
					local pos = Vector3.new(
						origin.X + v0.X * t,
						origin.Y + v0.Y * t - 0.5 * GRAVITY * t * t,
						origin.Z + v0.Z * t
					)
					trailParts[i].Position = pos
				end
				marker.Position = impact
			else
				hideTrail()
				marker.Position = Vector3.new(0, 5000, 0)
			end
		else
			hideTrail()
			marker.Position = Vector3.new(0, 5000, 0)
		end
	else
		hideTrail()
		marker.Position = Vector3.new(0, 5000, 0)
	end
end)