Be A Parkour Ninja KUNAI AIMBOT

local players = game:GetService("Players");
local runService = game:GetService("RunService");
local localPlayer = players.LocalPlayer;
local mouse = localPlayer:GetMouse();
local dot = Vector3.new().Dot;
local speed = 245; --dont change
local err = 1.0E-10;
local camera = workspace.CurrentCamera;
local isHolding = false; do
   local userInputService = game:GetService("UserInputService");
   userInputService.InputBegan:Connect(function(key, gp)
       if gp then return; end
       if key.UserInputType == Enum.UserInputType.MouseButton2 then
           isHolding = true;
       end
   end);
   userInputService.InputEnded:Connect(function(key, gp)
       if gp then return; end
       if key.UserInputType == Enum.UserInputType.MouseButton2 then
           isHolding = false;
       end
   end);
end

local function solveQuadratic(a, b, c)
   if a > -err and a < err then
       return -b / a;
   end
   local k = -b / (2 * a);
   local d = k * k - c / a;
   if d > -err and d < err then
       return;
   else
       local u = d ^ 0.5;
       return k + u, k - u;
   end
end
--https://playtechs.blogspot.com/2007/04/aiming-at-moving-target.html
local function trajectoryWithoutGravity(origin, target, movingVelocity, projectileSpeed)
   local p = target - origin;
   local c0 = dot(movingVelocity, movingVelocity) - projectileSpeed * projectileSpeed;
   local c1 = 2 * dot(p, movingVelocity);
   local c2 = dot(p, p);
   local t0, t1 = solveQuadratic(c0, c1, c2);
   if t0 and t0 > 0 then
       return -origin + t0 * movingVelocity + target;
   end
   if t1 and t1 > 0 then
       return -origin + t1 * movingVelocity + target;
   end
end

runService.RenderStepped:Connect(function()
   local max, close = 1 / 0;
   local plrs = players:GetPlayers();
   for i = 1, #plrs do
       local plr = plrs[i];
       if plr ~= localPlayer then
           local theirChar = plr.Character;
           local myChar = localPlayer.Character;
           if theirChar and myChar then
               local head = theirChar:FindFirstChild("Head");
               if head then
                   local pos, onScreen = camera:WorldToScreenPoint(head.Position);
                   if onScreen then
                       local dist = Vector2.new(pos.X - mouse.Y, pos.Y - mouse.Y).Magnitude;
                       if dist < max then
                           max = dist;
                           close = plr;
                       end
                   end
               end
           end
       end
   end
   if close then
       local character = localPlayer.Character;
       local theirCharacter = close.Character;
       local torso = character and character:FindFirstChild("Torso");
       local tool = character and character:FindFirstChildOfClass("Tool");
       if character and theirCharacter and torso and tool and isHolding then
           local head = theirCharacter:FindFirstChild("Head");
           local hrp = theirCharacter:FindFirstChild("HumanoidRootPart");
           if head and hrp then
               local origin = CFrame.new(torso.CFrame * Vector3.new(0, 1, -1));
               origin = CFrame.lookAt(origin.Position, head.Position) * CFrame.new(0, 0, 1);
               local v = trajectoryWithoutGravity(origin.Position, head.Position, hrp.Velocity, speed);
               if v then
                   --[[local hitAnything = workspace:FindPartOnRayWithIgnoreList(Ray.new(camera.CFrame.Position, v), {localPlayer.Character, camera});
                   if hitAnything then
                       return;
                   end]]
                   camera.CFrame = CFrame.lookAt(camera.CFrame.Position, camera.CFrame.Position + v);
               end
           end
       end
   end
end);