diff --git a/res/generators/default.lua b/res/generators/default.lua
new file mode 100644
index 00000000..65d7dcd2
--- /dev/null
+++ b/res/generators/default.lua
@@ -0,0 +1,37 @@
+local W = 256
+local H = 256
+
+function generate_heightmap(x, y)
+    local umap = Heightmap(W, H)
+    local vmap = Heightmap(W, H)
+    umap:noise({x+521, y+73}, 0.05, 1, 20.8)
+    umap:noise({x+51, y+75}, 0.05, 1, 21.8)
+    umap:noise({x+521, y+70}, 0.1, 3, 35.8)
+    vmap:noise({x+95, y+246}, 0.15, 3, 35.8)
+
+    local bmap = Heightmap(W, H)
+    bmap:noise({x+3, y+6}, 0.1, 1, 3)
+    local map = Heightmap(W, H)
+
+
+    map:noise({x, y}, 0.06, 5, 0.2, umap, vmap)
+    map:noise({x, y}, 0.12, 6, 0.5, umap, vmap)
+    map:mul(bmap)
+    map:mul(0.7)
+
+    local rivermap = Heightmap(W, H)
+    rivermap:noise({x+21, y+12}, 0.1, 3)
+    rivermap:abs()
+    rivermap:min(0.5)
+    rivermap:mul(2.0)
+    rivermap:pow(0.6)
+    map:add(1.2)
+    map:mul(rivermap)
+    map:add(-1.0)
+    map:mul(0.5)
+
+    return map
+end
+
+local map = generate_heightmap(0, 0)
+map:dump("heightmap.png")
diff --git a/res/scripts/world.lua b/res/scripts/world.lua
index c48b5615..964100e7 100644
--- a/res/scripts/world.lua
+++ b/res/scripts/world.lua
@@ -1,48 +1,3 @@
 -- use for engine development tests
 -- must be empty in release
 -- must not be modified by content-packs
-
-local W = 1024
-local H = 1024
-
-for t=1,1 do
-    local tm = time.uptime()
-
-    local umap = Heightmap(W, H)
-    local vmap = Heightmap(W, H)
-    umap:noise({521, 73}, 0.2, 1, 11.8)
-    umap:noise({51, 73}, 0.2, 1, 11.8)
-    umap:noise({521, 73}, 0.4, 6, 5.8)
-    vmap:noise({95, 246}, 0.6, 6, 5.8)
-
-    local bmap = Heightmap(W, H)
-    bmap:noise({3, 6}, 0.1, 1, 3)
-    local map = Heightmap(W, H)
-
-
-    map:noise({0, 0}, 0.06, 4, 0.2, umap, vmap)
-    map:noise({0, 0}, 0.25, 6, 0.5, umap, vmap)
-    map:mul(bmap)
-    map:mul(0.7)
-
-    local rivermap = Heightmap(W, H)
-    rivermap:noise({21, 12}, 0.05, 3)
-    rivermap:abs()
-    rivermap:min(0.1)
-    rivermap:mul(10.0)
-    rivermap:pow(0.8)
-    map:add(1.2)
-    map:mul(rivermap)
-    map:add(-1.0)
-    map:mul(0.5)
-
-    local overmap = Heightmap(W, H)
-    overmap:noise({1, 5122}, 0.02, 2, 0.2)
-    overmap:abs()
-    overmap:pow(0.5)
-    overmap:mul(-1.0)
-    map:add(overmap)
-
-    print(math.floor((time.uptime() - tm) * 1000000).." mcs")
-    map:dump("heightmap.png")
-end