diff --git a/biomegen/init.lua b/biomegen/init.lua
index 5c4d6e2..d99abab 100644
--- a/biomegen/init.lua
+++ b/biomegen/init.lua
@@ -84,6 +84,8 @@ local function calculate_noises(minp)
 end
 
 local function calc_biome_from_noise(heat, humid, pos)
+	--water_level = multi_map.get_absolute_centerpoint(multi_map.get_layer(p.y))
+	local offsety= multi_map.get_offset_y(pos.y,multi_map.get_layer(pos.y))
 	local biome_closest = nil
 	local biome_closest_blend = nil
 	local dist_min = 31000
@@ -91,14 +93,15 @@ local function calc_biome_from_noise(heat, humid, pos)
 
 	for i, biome in pairs(biomes) do
 		local min_pos, max_pos = biome.min_pos, biome.max_pos
-		if pos.y >= min_pos.y and pos.y <= max_pos.y+biome.vertical_blend
+		--if offsety >= min_pos.y and
+		if offsety <= max_pos.y+biome.vertical_blend
 				and pos.x >= min_pos.x and pos.x <= max_pos.x
 				and pos.z >= min_pos.z and pos.z <= max_pos.z then
 			local d_heat = heat - biome.heat_point
 			local d_humid = humid - biome.humidity_point
 			local dist = d_heat*d_heat + d_humid*d_humid -- Pythagorean distance
 
-			if pos.y <= max_pos.y then -- Within y limits of biome
+			if offsety <= max_pos.y then -- Within y limits of biome
 				if dist < dist_min then
 					dist_min = dist
 					biome_closest = biome
@@ -289,7 +292,9 @@ local liquid = setmetatable({}, {
 	end,
 })
 
-local function can_place_deco(deco, data, vi, pattern)
+local function can_place_deco(deco, data, vi, pattern,y)
+	local offsety= multi_map.get_offset_y(y,multi_map.get_layer(y))
+	if offsety < deco.y_min or offsety > deco.y_max then return false end
 	if not deco.place_on[data[vi]] then
 		return false
 	elseif deco.num_spawn_by <= 0 then
@@ -395,7 +400,7 @@ local function place_deco(deco, data, a, vm, minp, maxp, blockseed)
 						for _, y in ipairs(floors) do
 							if y >= biome.y_min and y <= biome.y_max then
 								local pos = {x=x, y=y, z=z}
-								if can_place_deco(deco, data, vi, pattern) then
+								if can_place_deco(deco, data, vi, pattern,y) then
 									deco:generate(vm, ps, pos, false)
 								end
 							end
@@ -406,7 +411,7 @@ local function place_deco(deco, data, a, vm, minp, maxp, blockseed)
 						for _, y in ipairs(ceilings) do
 							if y >= biome.y_min and y <= biome.y_max then
 								local pos = {x=x, y=y, z=z}
-								if can_place_deco(deco, data, vi, pattern) then
+								if can_place_deco(deco, data, vi, pattern,y) then
 									deco:generate(vm, ps, pos, true)
 								end
 							end
@@ -449,7 +454,7 @@ local function place_deco(deco, data, a, vm, minp, maxp, blockseed)
 
 					if biome_ok then
 						local pos = {x=x, y=y, z=z}
-						if can_place_deco(deco, data, a:index(x,y,z), pattern) then
+						if can_place_deco(deco, data, a:index(x,y,z), pattern,y) then
 							deco:generate(vm, ps, pos, false)
 						end
 					end
@@ -497,9 +502,6 @@ local dustable = setmetatable({}, {
 
 local function dust_top_nodes(data, a, vm, minp, maxp)
 	water_level = multi_map.get_absolute_centerpoint()
-	if maxp.y < water_level then
-		return
-	end
 
 	local full_maxp = a.MaxEdge
 
@@ -559,7 +561,7 @@ biomegen = {
 }
 
 function biomegen.generate_all(data, a, vm, minp, maxp, seed)
-	water_level = multi_map.get_absolute_centerpoint()
+	water_level = multi_map.get_absolute_centerpoint(multi_map.get_layer(minp.y))
 	generate_biomes(data, a, minp, maxp)
 	vm:set_data(data)
 	place_all_decos(data, a, vm, minp, maxp, seed)