ROBLOX Over-the-Shoulder view

-- LocalScript instance inside the StarterGui
local c = Workspace.CurrentCamera
local p = Game.Players.LocalPlayer
local char = p.Character
local s = Game:GetService("RunService");
local m = p:GetMouse();

-- settings
c.CameraType = "Scriptable"

-- while loop to set camera coordinate frame
s.RenderStepped:connect(function()
    local directlybehind = char.Torso.Position + (char.Torso.CFrame.lookVector * -8)
    local shift = char.Torso.CFrame:vectorToWorldSpace(Vector3.new(4,0,0)) + Vector3.new(0,3,0);
    local lookat = char.Torso.Position + char.Torso.CFrame.lookVector * 1e50
    c.CoordinateFrame = CFrame.new(directlybehind + shift, lookat);
end)

m.Move:connect(function()
    char.Torso.CFrame = CFrame.new(char.Torso.Position,
        Vector3.new(m.Hit.p.x, char.Torso.Position.Y, m.Hit.p.z));
end)