Indev version of snow for Starfall!

snow.lua

--@name Snow!
--@author Feven Kitsune
--@client

local emitter = particle.create( chip():getPos(), false)
local size = 100
local ready = false
local pmax = 100
if hasPermission("convar") then
    pmax = convar.getInt("sf_particles_max")
end
local pdietime = 6.5
local ppt = 1 -- particles per tick, default 1
local tickrate = pdietime / pmax
local psizemin = 2
local psizemax = 5

local textures = {
    "https://i.imgur.com/4P3xSl4.png",
    "https://i.imgur.com/RCRIAgQ.png",
    "https://i.imgur.com/N9hRt4t.png",
    "https://i.imgur.com/gcBR930.png"
}

local loaded_materials = {}

local function HandleMaterial(mtl, url, width, height, layout)
    if not width or not height then
        mat:setTexture("$basetexture", "hunter/myplastic")
        print("Invalid texture URL")
        return
    end
    
    local xScale = 1024 / width
    local yScale = 1024 / height
    layout(0, 0, width * xScale, height * yScale, true)
    table.insert(loaded_materials, mtl)
    ready = true
end

for _, v in ipairs(textures) do
    local mat = material.create("UnlitGeneric")
    mat:setTextureURL("$basetexture", v, HandleMaterial)
    mat:setInt("$flags",256)
end

timer.create("SnowSpawn", tickrate, 0, function()
    if not ready then return end -- no materials have been loaded yet, return
    for i = 1, ppt do
        local psize = math.rand( psizemin, psizemax )
        if not emitter:isValid() then return end
        if emitter:getParticlesLeft() < 1 then return end
        local part = emitter:add( table.random(loaded_materials),
            chip():localToWorld(Vector(math.rand(-size, size), math.rand(-size, size), math.rand(0, 1))), -- position
            psize,  -- start size
            psize,  -- end size
            psize,  -- start length
            psize,  -- end length
            255,-- start alpha
            255,  -- end alpha
            pdietime   -- die time
        ) -- Create a new particle at pos
        if ( part ) then
            part:setGravity( Vector( 0, 0, -10 ) ) -- Gravity of the particle
            part:setVelocity( Vector(math.rand(-1, 1),math.rand(-1, 1),math.rand(-.1, 0)) * 10 ) -- Initial velocity of the particle
            part:setCollide( true )
        end
    end
end)

hook.add("removed", "removeEmitter", function()
    emitter:destroy()
end)

12/17/2023 @ 2:54pm:

• Updated time, system clock was off.
• Added permissions check for convar