diff --git a/rocks/gensed.lua b/rocks/gensed.lua
index 72c3954..9dd67dd 100644
--- a/rocks/gensed.lua
+++ b/rocks/gensed.lua
@@ -34,10 +34,8 @@ local np_sp = {
 local stats
 stats={ total=0 }
 
-rocksl.gensed = function (minp, maxp, seed)
+rocksl.gensed = function (minp, maxp, seed, vm, area)
  local t1 = os.clock()
- local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
- local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
  local data = vm:get_data()
 
  local chunksize = maxp.x - minp.x + 1
@@ -160,7 +158,6 @@ rocksl.gensed = function (minp, maxp, seed)
  end end
  if generated then
   vm:set_data(data)
-  vm:write_to_map(data)
   if stats then for k,v in pairs(stats) do  print("stat: "..k..": "..((v/stats.total)*100).."%") end end
  else
   print("no sed layer y="..minp.y)
diff --git a/rocks/ign.lua b/rocks/ign.lua
index 4e6ef69..fe7ed41 100644
--- a/rocks/ign.lua
+++ b/rocks/ign.lua
@@ -91,10 +91,9 @@ local np_intr = {
  seed = 3740,
 }
 
-minetest.register_on_generated( function( minp, maxp, seed )
+--minetest.register_on_generated( function( minp, maxp, seed )
+rocksl.genign=function(minp,maxp,seed, vm, area)
  local t1 = os.clock()
- local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
- local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
  local data = vm:get_data()
 
  local chunksize = maxp.x - minp.x + 1
@@ -137,9 +136,8 @@ minetest.register_on_generated( function( minp, maxp, seed )
  vm:set_data(data)
  --DEBUG: vm:set_lighting({day=15,night=2})
  minetest.generate_ores(vm)
- vm:write_to_map(data)
  minetest.log("action", "rocks/layer/ "..math.ceil((os.clock() - t1) * 1000).." ms ")
-end)
+end
 
 
 -- ~ Tomas Brod
\ No newline at end of file
diff --git a/rocks/init.lua b/rocks/init.lua
index 1d8df9c..70795cb 100644
--- a/rocks/init.lua
+++ b/rocks/init.lua
@@ -30,7 +30,14 @@ dofile(modpath.."/ign.lua")
 dofile(modpath.."/skarn.lua")
 dofile(modpath.."/pegmatite.lua")
 dofile(modpath.."/gensed.lua")
-minetest.register_on_generated(rocksl.gensed)
+
+minetest.register_on_generated(function(minp,maxp,seed)
+ local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+ local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
+ rocksl.gensed(minp,maxp,seed,vm,area)
+ --rocksl.genign
+ vm:write_to_map(data)
+end)
 
 minetest.register_on_mapgen_init(function(mapgen_params)
  -- todo: disable caves and ores