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air_light_level.lua

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+--for light node that don't spread
+for i=1,14 do
+    minetest.register_node("air_light_level:" .. i, {
+
+        description = "Air: light level " .. i,
+
+        drawtype = "airlike",
+
+        paramtype = "light",
+        sunlight_propagates = true, --shouldn't replace sunlight in case of transparent ceiling
+
+        light_source = i,
+
+        walkable     = false,
+        pointable    = false,
+        diggable     = false,
+        buildable_to = true, 
+
+        air_equivalent = true,
+        floodable = true,
+        drop = "",
+        groups = {}--not_in_creative_inventory=0}
+
+        
+    })
+end

air_light_level_debug.lua

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+--for light node that don't spread
+for i=1,14 do
+    minetest.register_node("air_light_level:" .. i, {
+
+        description = "Air: light level " .. i,
+--[[
+        drawtype = "airlike",
+]]--        
+        drawtype = 'nodebox',
+        tiles = {"link.png"},
+        paramtype2 = 'facedir',
+        paramtype = "light",
+        sunlight_propagates = true, --shouldn't replace sunlight in case of transparent ceiling
+
+        light_source = i,
+
+        walkable     = false,
+        pointable    = true, --true for testing purposes
+        diggable     = false,
+        buildable_to = true, 
+
+        air_equivalent = true,
+        floodable = true,
+        drop = "",
+        groups = {}--not_in_creative_inventory=0}
+
+        
+    })
+end

flood_light_level.lua

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+--/!\USE WITH CAUTION/!\
+--light nodes that will try to fill internal spaces
+for i=1,14 do
+    minetest.register_node(":flood_light_level:" .. i, {
+        description = "Air node that emits light and floods internal spaces: light level " .. i,
+
+        drawtype = "airlike",
+
+        paramtype = "light",
+        sunlight_propagates = true, --shouldn't replace sunlight in case of transparent ceiling
+
+        light_source = i,
+
+        walkable     = false,
+        pointable    = false,
+        diggable     = false,
+        buildable_to = true, 
+
+        air_equivalent = true,
+        floodable = true,
+        drop = "",
+        groups = {}--not_in_creative_inventory=0}
+    })
+end

flood_light_level_debug.lua

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+--/!\USE WITH CAUTION/!\
+--light nodes that will fill any space below a ceiling
+for i=1,14 do
+    minetest.register_node(":flood_light_level:" .. i, {
+        description = "Air node that emits light and floods internal spaces: light level " .. i,
+--[[
+        drawtype = "airlike",
+]]--        
+        drawtype = 'nodebox',
+        tiles = {"head.png"},
+        paramtype2 = 'facedir',
+        paramtype = "light",
+        sunlight_propagates = true, --shouldn't replace sunlight in case of transparent ceiling
+
+        light_source = i,
+
+        walkable     = false,
+        pointable    = true, --true for testing purposes
+        diggable     = false,
+        buildable_to = true, 
+
+        air_equivalent = true,
+        floodable = true,
+        drop = "",
+        groups = {}--not_in_creative_inventory=0}
+    })
+end

init.lua

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+local modpath = minetest.get_modpath("air_light_level")
+
+dofile(modpath .. "/air_light_level.lua")
+dofile(modpath .. "/flood_light_level.lua")
+--dofile(modpath .. "/air_light_level_debug.lua")
+--dofile(modpath .. "/flood_light_level_debug.lua")
+
+local get_node = minetest.get_node
+local swap_node = minetest.swap_node --preserve metadatas
+local set_node = minetest.set_node --used to reset metadatas
+
+--WIP
+-- spread on the ceiling first
+-- then spread downward
+-- disappear if there is air above
+-- when surrounded by "air_light_spread", become still version
+-- create "outer layer" node?
+for i=1,13 do
+    minetest.register_abm({
+        label = "air light spreading" .. i,
+        nodenames = {"flood_light_level:" .. i},
+        neighbors = {},
+        interval = 1.0,
+        chance = 1,
+        catch_up = true,
+        action = function(pos, node)
+            minetest.chat_send_all("ABM running for " .. tostring("air light spreading " .. i))
+                local dirs = {
+                    vector.new(pos.x+1,pos.y,pos.z),
+                    vector.new(pos.x-1,pos.y,pos.z),
+                    vector.new(pos.x,pos.y+1,pos.z), --dirs[3] = up?
+                    vector.new(pos.x,pos.y-1,pos.z),
+                    vector.new(pos.x,pos.y,pos.z+1),
+                    vector.new(pos.x,pos.y,pos.z-1)
+                }
+                for v = 1, 6 do
+                    if get_node(dirs[3]).name == "air" then --if there is an air node above then
+                        if get_node(dirs[4]).name == "air_light_level:" .. i then
+                            set_node(dirs[4],{name="flood_light_level:" .. i})
+                            minetest.chat_send_all("node below set to flood")
+                        end
+                        set_node(pos,{name="air"}) --turn self into air
+                        minetest.chat_send_all("node removed")
+                    break
+                    end
+
+                    local node = get_node(dirs[v]).name
+                    local node_above = get_node(vector.add(dirs[v],(vector.new(0,1,0)))).name
+                    if node == "air" and node_above ~= "air" then
+--                        minetest.chat_send_all("found air at " .. tostring(dirs[v]))
+                        set_node(dirs[v],{name="flood_light_level:" .. i}) --spread
+                    else
+--                        minetest.chat_send_all("no air or air above at " .. tostring(dirs[v]))
+                    end
+                    if v == 6 and (get_node(dirs[3]).name == "flood_light_level:" .. i or get_node(dirs[3]).name == "air_light_level:" .. i) then --if end of loop and node above is flood type then
+                        set_node(pos,{name="air_light_level:" .. i}) --become a still node
+                        minetest.chat_send_all("v == " .. tostring(v) .. " node become still")
+                    end
+
+                end
+        end
+    })
+end