Ray Reflection

local RayBase = workspace.Model.RayBase

function RenderRay(R)
    local Part = Instance.new("Part")
    local RayLength = ( (R.Origin + R.Direction) - R.Origin ).magnitude
    Part.Size = Vector3.new(0,0,RayLength)
    Part.CFrame = CFrame.new(R.Origin, R.Origin + R.Direction) * CFrame.new(0,0,RayLength/-2)
    Part.BrickColor = BrickColor.Yellow()
    Part.Anchored = true
    Part.Name = "Ray"
    Part.Parent = workspace
end

do
    -- Cast ray in direction of RayBase's front surface
    local R = Ray.new(RayBase.Position, RayBase.CFrame.lookVector * 500)
    local HitPart, HitPoint, Normal = workspace:FindPartOnRay(R, RayBase)
    -- Override normal
    Normal = Vector3.new(Normal.Y, Normal.Z, Normal.X)
    --Normal = Vector3.new(0,1,0)
    -- Draw the initial ray
    RenderRay( Ray.new(RayBase.Position, RayBase.CFrame.lookVector * (HitPoint - RayBase.Position).magnitude) )

    -- Calculate the direction of the reflected ray
    local ClosestPointOnNormalLine = Ray.new(HitPoint, Normal):ClosestPoint(RayBase.Position)
    local Alpha = (ClosestPointOnNormalLine - RayBase.Position).magnitude
    local ReflectionDirection = (((2 *  Normal) * (R.Unit.Direction:Dot(Normal))) - (1 * R.Unit.Direction)).unit
    local ReflectedRay = Ray.new(HitPoint, ReflectionDirection * 100, HitPart)
    RenderRay(ReflectedRay)
end