many worldgen mods and gonna try technic now

mods/winuserleafdecay/functions.lua

@@ -0,0 +1,79 @@
+winuserleafdecay = {}
+
+local function winleafdecay_after_destruct(pos, oldnode, def)
+for _, v in pairs(minetest.find_nodes_in_area(vector.subtract(pos, def.radius),
+			vector.add(pos, def.radius), def.leaves)) do
+		local node = minetest.get_node(v)
+		local timer = minetest.get_node_timer(v)
+		if node.param2 ~= 3 and not timer:is_started() then
+			timer:start(math.random(20, 120) / 10)
+		end
+	end
+end
+
+local movement_gravity = tonumber(
+	minetest.settings:get("movement_gravity")) or 9.81
+
+local function  winleafdecay_on_timer(pos, def)
+if minetest.find_node_near(pos, def.radius, def.trunks) then
+		return false
+	end
+
+	local node = minetest.get_node(pos)
+	local drops = minetest.get_node_drops(node.name)
+	for _, item in ipairs(drops) do
+		local is_leaf
+		for _, v in pairs(def.leaves) do
+			if v == item then
+				is_leaf = true
+			end
+		end
+		if minetest.get_item_group(item, "winleafdecay_drop") ~= 0 or
+				not is_leaf then
+			minetest.add_item({
+				x = pos.x - 0.5 + math.random(),
+				y = pos.y - 0.5 + math.random(),
+				z = pos.z - 0.5 + math.random(),
+			}, item)
+		end
+	end
+
+	minetest.remove_node(pos)
+	minetest.check_for_falling(pos)
+
+	-- spawn a few particles for the removed node
+	minetest.add_particlespawner({
+		amount = 8,
+		time = 0.001,
+		minpos = vector.subtract(pos, {x=0.5, y=0.5, z=0.5}),
+		maxpos = vector.add(pos, {x=0.5, y=0.5, z=0.5}),
+		minvel = vector.new(-0.5, -1, -0.5),
+		maxvel = vector.new(0.5, 0, 0.5),
+		minacc = vector.new(0, -movement_gravity, 0),
+		maxacc = vector.new(0, -movement_gravity, 0),
+		minsize = 0,
+		maxsize = 0,
+		node = node,
+	})
+end
+
+function winuserleafdecay.register_winleafdecay(def)
+	assert(def.leaves)
+	assert(def.trunks)
+	assert(def.radius)
+	for _, v in pairs(def.trunks) do
+		minetest.override_item(v, {
+			after_destruct = function(pos, oldnode)
+				winleafdecay_after_destruct(pos, oldnode, def)
+			end,
+		})
+	end
+	for _, v in pairs(def.leaves) do
+		minetest.override_item(v, {
+			on_timer = function(pos)
+				winleafdecay_on_timer(pos, def)
+			end,
+		})
+	end
+end
+