Prop Rain

How to create a rain effect with Props (boxes) falling from sky once a Character enters a Trigger.

Final result

Server/Index.lua

-- Spawns a Trigger
my_trigger = Trigger(Vector(200, 200, 0), Rotator(), 200)

-- Defines my_timer globally to be used to store Timer
my_timer = nil

-- Sets BeginOverlap event
my_trigger:Subscribe("BeginOverlap", function(trigger, actor_triggering)
    -- Only activates if a Character enters it (IsA also matches classes inherited from Character)
    if (not actor_triggering:IsA(Character)) then
        return
    end

    -- Only one rain at a time, otherwise every Character entering would start a new Timer
    if (my_timer ~= nil) then
        return
    end

    -- Sets a Timer at each 100ms to spawn a Prop
    my_timer = Timer.SetInterval(function()
        -- Gets random Location and Rotation
        local prop_spawn_location = Vector(math.random(100, 300), math.random(100, 300), math.random(800, 1200))
        local prop_spawn_rotation = Rotator(math.random(0, 360), math.random(0, 360), math.random(0, 360))

        -- Spawns a Crate
        local crate = Prop(prop_spawn_location, prop_spawn_rotation, "nanos-world::SM_Crate_07")

        -- Destroys it after 10 seconds, so the server doesn't fill up with Props
        crate:SetLifeSpan(10)
    end, 100)
end)

-- Sets EndOverlap event
my_trigger:Subscribe("EndOverlap", function(trigger, actor_triggering)
    -- Only deactivates if a Character leaves it
    if (not actor_triggering:IsA(Character)) then
        return
    end

    -- Stops/Clear the Timer
    if (my_timer ~= nil) then
        Timer.ClearInterval(my_timer)
        my_timer = nil
    end
end)