diff --git a/data/mods/default/init.lua b/data/mods/default/init.lua
index 88f457e29..6ea15b4ee 100644
--- a/data/mods/default/init.lua
+++ b/data/mods/default/init.lua
@@ -15,6 +15,7 @@
 -- minetest.register_on_placenode(func(pos, newnode, placer))
 -- minetest.register_on_dignode(func(pos, oldnode, digger))
 -- minetest.register_on_punchnode(func(pos, node, puncher))
+-- minetest.register_on_generated(func(minp, maxp))
 -- minetest.register_on_newplayer(func(ObjectRef))
 -- minetest.register_on_respawnplayer(func(ObjectRef))
 -- ^ return true in func to disable regular player placement
@@ -1329,6 +1330,12 @@ minetest.register_on_respawnplayer(function(player)
 	-- return true
 end)
 
+minetest.register_on_generated(function(minp, maxp)
+	--print("on_generated: minp="..dump(minp).." maxp="..dump(maxp))
+	--cp = {x=(minp.x+maxp.x)/2, y=(minp.y+maxp.y)/2, z=(minp.z+maxp.z)/2}
+	--minetest.env:add_node(cp, {name="sand"})
+end)
+
 -- Example setting get
 print("setting max_users = " .. dump(minetest.setting_get("max_users")))
 print("setting asdf = " .. dump(minetest.setting_get("asdf")))
diff --git a/src/mapgen.h b/src/mapgen.h
index 55aede099..207dfdaf7 100644
--- a/src/mapgen.h
+++ b/src/mapgen.h
@@ -60,7 +60,7 @@ namespace mapgen
 		u64 seed;
 		v3s16 blockpos;
 		UniqueQueue<v3s16> transforming_liquid;
-		INodeDefManager *nodedef; // Destructor deletes
+		INodeDefManager *nodedef;
 
 		BlockMakeData();
 		~BlockMakeData();
diff --git a/src/scriptapi.cpp b/src/scriptapi.cpp
index badf38181..976b482c2 100644
--- a/src/scriptapi.cpp
+++ b/src/scriptapi.cpp
@@ -843,6 +843,13 @@ static int l_register_on_punchnode(lua_State *L)
 	return register_lua_callback(L, "registered_on_punchnodes");
 }
 
+// register_on_generated(function)
+static int l_register_on_generated(lua_State *L)
+{
+	infostream<<"register_on_generated"<<std::endl;
+	return register_lua_callback(L, "registered_on_generateds");
+}
+
 // register_on_newplayer(function)
 static int l_register_on_newplayer(lua_State *L)
 {
@@ -893,6 +900,7 @@ static const struct luaL_Reg minetest_f [] = {
 	{"register_on_placenode", l_register_on_placenode},
 	{"register_on_dignode", l_register_on_dignode},
 	{"register_on_punchnode", l_register_on_punchnode},
+	{"register_on_generated", l_register_on_generated},
 	{"register_on_newplayer", l_register_on_newplayer},
 	{"register_on_respawnplayer", l_register_on_respawnplayer},
 	{"setting_get", l_setting_get},
@@ -1391,6 +1399,8 @@ void scriptapi_export(lua_State *L, Server *server)
 	lua_newtable(L);
 	lua_setfield(L, -2, "registered_on_punchnodes");
 	lua_newtable(L);
+	lua_setfield(L, -2, "registered_on_generateds");
+	lua_newtable(L);
 	lua_setfield(L, -2, "registered_on_newplayers");
 	lua_newtable(L);
 	lua_setfield(L, -2, "registered_on_respawnplayers");
@@ -1694,6 +1704,32 @@ void scriptapi_environment_on_punchnode(lua_State *L, v3s16 p, MapNode node,
 	}
 }
 
+void scriptapi_environment_on_generated(lua_State *L, v3s16 minp, v3s16 maxp)
+{
+	realitycheck(L);
+	assert(lua_checkstack(L, 20));
+	infostream<<"scriptapi_environment_on_generated"<<std::endl;
+	StackUnroller stack_unroller(L);
+
+	// Get minetest.registered_on_generateds
+	lua_getglobal(L, "minetest");
+	lua_getfield(L, -1, "registered_on_generateds");
+	luaL_checktype(L, -1, LUA_TTABLE);
+	int table = lua_gettop(L);
+	// Foreach
+	lua_pushnil(L);
+	while(lua_next(L, table) != 0){
+		// key at index -2 and value at index -1
+		luaL_checktype(L, -1, LUA_TFUNCTION);
+		// Call function
+		pushpos(L, minp);
+		pushpos(L, maxp);
+		if(lua_pcall(L, 2, 0, 0))
+			script_error(L, "error: %s\n", lua_tostring(L, -1));
+		// value removed, keep key for next iteration
+	}
+}
+
 /*
 	luaentity
 */
diff --git a/src/scriptapi.h b/src/scriptapi.h
index 08c835172..9bdf99c62 100644
--- a/src/scriptapi.h
+++ b/src/scriptapi.h
@@ -49,6 +49,8 @@ void scriptapi_environment_on_dignode(lua_State *L, v3s16 p, MapNode oldnode,
 // When punching node
 void scriptapi_environment_on_punchnode(lua_State *L, v3s16 p, MapNode node,
 		ServerActiveObject *puncher);
+// After generating a piece of map
+void scriptapi_environment_on_generated(lua_State *L, v3s16 minp, v3s16 maxp);
 
 /* misc */
 void scriptapi_on_newplayer(lua_State *L, ServerActiveObject *player);
diff --git a/src/server.cpp b/src/server.cpp
index c9881567d..49fdabd67 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -234,6 +234,11 @@ void * EmergeThread::Thread()
 						if(enable_mapgen_debug_info)
 							infostream<<"EmergeThread: generating"<<std::endl;
 						block = map.generateBlock(p, modified_blocks);
+						
+						v3s16 minp = block->getPos()*MAP_BLOCKSIZE;
+						v3s16 maxp = minp + v3s16(1,1,1)*(MAP_BLOCKSIZE-1);
+						scriptapi_environment_on_generated(m_server->m_lua,
+								minp, maxp);
 					}
 				}