How to add to my game snow?

local Players = game:GetService("Players")

local Configuration = {
    SnowModelName     = "ThatSnowRenderModel";
    SnowColor         = Vector3.new(1, 1, 1);
    SmallestFlakeSize = 8;
    LargestFlakeSize  = 15;
    MaxMoveX          = 5; 
    MinMoveX          = -5;
    MaxMoveY          = 1;
    MinMoveY          = -12;
    MaxMoveZ          = 5;
    MinMoveZ          = -5;
    CyclesPerLifeMax  = 4;
    CyclesPerLifeMin  = 2;
    CycleLife         = 20;
    MaxTransparency   = 0.3;
    RangeX = 8;
    RangeY = 4;
    RangeZ = 8;

    SnowAmountFactor = 3;
}

local function GetSnowModel()
    local Model = workspace:FindFirstChild(Configuration.SnowModelName)
    if not Model then
        Model = Instance.new("Camera", workspace)
        Model.Name = Configuration.SnowModelName
        Model.Archivable = false;
    end
    return Model
end

local function GetSnowflakeMovement()
    return Vector3.new(
        math.random(Configuration.MinMoveX, Configuration.MaxMoveX)/100,
        math.random(Configuration.MinMoveY, Configuration.MaxMoveY)/100,
        math.random(Configuration.MinMoveZ, Configuration.MaxMoveZ)/100
    )
end

local function GetRandomSnowflakePosition(LastValidPlace) 

    return CFrame.new() + LastValidPlace:pointToWorldSpace(Vector3.new(
            math.random(-Configuration.RangeX, Configuration.RangeX),
            math.random(-3, Configuration.RangeY),
            math.random(-Configuration.RangeZ*2, 0)))
end

local SnowflakeQueue = {}

local function UpdateQueue()
    local HalfLife = Configuration.CycleLife;
    local MaxTransparency = Configuration.MaxTransparency

    local Index = 1
    while Index <= #SnowflakeQueue do
        local SnowFlake = SnowflakeQueue[Index]

        local CycleTick = SnowFlake.CycleTick
        local Flake = SnowFlake.Flake
        if SnowFlake.Mode == 2 then
            SnowFlake.CyclesLeft = SnowFlake.CyclesLeft - 1
            if SnowFlake.CyclesLeft <= 0 then
                SnowFlake.Flake:Destroy()
                table.remove(SnowflakeQueue, Index)
            else
                SnowFlake.CycleTick = Configuration.CycleLife
                SnowFlake.Mode = 0
                Index = Index + 1
            end
        elseif SnowFlake.Mode == 0 then
            Flake.Transparency = (CycleTick/HalfLife)* MaxTransparency + (MaxTransparency)
            Flake.CFrame = Flake.CFrame + SnowFlake.MoveRate
            SnowFlake.CycleTick = CycleTick - 1
            if SnowFlake.CycleTick <= 0 then
                SnowFlake.Mode = 1
            end
            Index = Index + 1
        elseif SnowFlake.Mode == 1 then
            Flake.Transparency = (CycleTick/HalfLife)*MaxTransparency + (MaxTransparency)
            Flake.CFrame = Flake.CFrame + SnowFlake.MoveRate
            SnowFlake.CycleTick = CycleTick + 1
            if SnowFlake.CycleTick >= HalfLife then
                SnowFlake.Mode = 2
            end
            Index = Index + 1
        end
    end
end

local function MakeSnowFlake(Parent, InitialCFrame)
    local FlakeSize = math.random(Configuration.SmallestFlakeSize, Configuration.LargestFlakeSize)/100

    local Flake         = Instance.new("Part", Parent)
    Flake.Anchored      = true;
    Flake.CanCollide    = false;
    Flake.FormFactor    = "Custom";
    Flake.Size          = Vector3.new(1, 1, 1)
    Flake.Name          = "SnowFlake";
    Flake.BottomSurface = "Smooth";
    Flake.CFrame        = InitialCFrame
    Flake.Transparency  = 1;

    local Mesh = Instance.new("SpecialMesh", Flake)
    Mesh.MeshType    = "FileMesh"
    Mesh.MeshId      = "http://www.roblox.com/asset/?id=1185246"
    Mesh.TextureId   = "http://www.roblox.com/asset/?id=1361097"
    Mesh.VertexColor = Configuration.SnowColor;
    Mesh.Scale       = Vector3.new(FlakeSize, FlakeSize, FlakeSize)

    local SnowFlake = {}
    SnowFlake.Flake = Flake;
    SnowFlake.CycleTick = Configuration.CycleLife
    SnowFlake.CyclesLeft = math.random(Configuration.CyclesPerLifeMin, Configuration.CyclesPerLifeMax)
    SnowFlake.MoveRate = GetSnowflakeMovement()
    SnowFlake.Mode = 0
    table.insert(SnowflakeQueue, SnowFlake)
end

local function CheckPlayer(Player)


    return Player and Player:IsA("Player") and Player:IsDescendantOf(Players)
end


local function CheckCharacter(Player)


    if CheckPlayer(Player) then
        local Character = Player.Character;

        if Character then

            return Character.Parent
                and Character:FindFirstChild("Humanoid")
                and Character:FindFirstChild("HumanoidRootPart")
                and Character:FindFirstChild("Torso") 
                and Character:FindFirstChild("Head") 
                and Character.Humanoid:IsA("Humanoid")
                and Character.Head:IsA("BasePart")
                and Character.Torso:IsA("BasePart")
                and true
        end
    else
        warn("[CheckCharacter] - Character Check failed!")
    end

    return nil
end




local FindPartOnRayWithIgnoreList = workspace.FindPartOnRayWithIgnoreList

local function AdvanceRaycast(RayTrace, IgnoreList, TransparencyThreshold, IgnoreCanCollideFalse, TerrainCellsAreCubes, MaximumCastCount, CustomCondition)

    assert(type(MaximumCastCount) == "number", "MaximumCastCount is not a number")
    assert(type(TransparencyThreshold) == "number", "TransparencyThreshold must be a number")



    local ContinueCasting = true;
    local CastCount = 0

    local function CastAttempt(NewRayTrace)


        if CastCount >= MaximumCastCount then
            return
        else
            CastCount = CastCount + 1
        end

        local Object, Position = FindPartOnRayWithIgnoreList(workspace, NewRayTrace, IgnoreList, TerrainCellsAreCubes)

        if Object and Position then
            if CustomCondition and CustomCondition(Object, Position) then

                return Object, Position
            elseif IgnoreCanCollideFalse and Object.CanCollide == false then
                IgnoreList[#IgnoreList+1] = Object


                return CastAttempt(NewRayTrace)
            elseif TransparencyThreshold and Object.Transparency >= TransparencyThreshold then
                IgnoreList[#IgnoreList+1] = Object


                return CastAttempt(NewRayTrace)
            else
                return Object, Position
            end
        else

            return
        end
    end

    local DirectionUnit = RayTrace.Direction.unit
    local Magnitude = RayTrace.Direction.magnitude
    local CastedMagnitude = 0



    while CastedMagnitude < Magnitude do
        local ToCastMagnitude = Magnitude - CastedMagnitude

        if ToCastMagnitude > 999.5 then
            ToCastMagnitude = 999
        end

        local WaysAlongPath = RayTrace.Origin + (DirectionUnit * CastedMagnitude)
        local NewRayTrace = Ray.new(WaysAlongPath, DirectionUnit * ToCastMagnitude)
        local Object, Position = CastAttempt(NewRayTrace)


        if Object then
            return Object, Position
        end

        CastedMagnitude = CastedMagnitude + ToCastMagnitude

        if CastCount >= MaximumCastCount then
            print("[AdvanceRaycast] - Reached maximum cast count @ " .. CastCount .. "; MaximumCastCount = " .. MaximumCastCount)
            return nil
        end
    end
end

local SnowModel = GetSnowModel()
SnowModel:ClearAllChildren()

local LocalPlayer = Players.LocalPlayer


local LastValidPlace
local IgnoreList = {SnowModel, LocalPlayer.Character}
local LastClean = tick()

local function CleanIgnoreList()
    if LastClean + 5 <= tick() then
        IgnoreList = {SnowModel, LocalPlayer.Character}
        LastClean = tick()
    end
end

local function DrawRay(Ray, Color, Parent)


    Parent = Parent or workspace

    local NewPart = Instance.new("Part", Parent)

    NewPart.FormFactor = "Custom"
    NewPart.Size       = Vector3.new(0.2, Ray.Direction.magnitude, 0.2)

    local Center = Ray.Origin + Ray.Direction/2


    NewPart.CFrame     = CFrame.new(Center, Ray.Origin + Ray.Direction) * CFrame.Angles(math.pi/2, 0, 0) 
    NewPart.Anchored   = true
    NewPart.CanCollide = false
    NewPart.Transparency = 0.5
    NewPart.BrickColor = Color or BrickColor.new("Bright red")
    NewPart.Name = "DrawnRay"

    Instance.new("SpecialMesh", NewPart)

    return NewPart
end


while true do
    local Camera = workspace.CurrentCamera
    if Camera then

        local ExtensionRay = Ray.new(Camera.CoordinateFrame.p, 
            Camera.CoordinateFrame:vectorToWorldSpace(Vector3.new(0, 0, -Configuration.RangeZ))
            )
        local Hit, Position =  AdvanceRaycast(ExtensionRay, IgnoreList, 0.001, true, true, 5)
        if not Hit then

            local NewRay = Ray.new((Camera.CoordinateFrame * CFrame.new(0, 0, -Configuration.RangeZ)).p, Vector3.new(0, 100, 0))
            local Hit, Position =  AdvanceRaycast(NewRay, IgnoreList, 0.001, true, true, 5)
            if not Hit then
                LastValidPlace = Camera.CoordinateFrame
            end
        end

        if LastValidPlace then
            for Index = 1, Configuration.SnowAmountFactor do
                MakeSnowFlake(SnowModel, GetRandomSnowflakePosition(LastValidPlace, Camera.CoordinateFrame))
            end
        end
    end
    UpdateQueue()
    CleanIgnoreList()
    wait(0.03)
end