many worldgen mods and gonna try technic now

mods/dfcaverns/df_caverns/surface_tunnels.lua

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+-- surface tunnels
+
+local y_max = 200
+local y_min = df_caverns.config.ymax
+
+local c_stone = df_caverns.node_id.stone
+local c_air = df_caverns.node_id.air
+
+minetest.register_on_generated(function(minp, maxp, seed)
+	--if out of range of cave definition limits, abort
+	if minp.y > y_max or maxp.y < y_min then
+		return
+	end	
+	
+	local t_start = os.clock()
+
+	local vm, data, data_param2, area = mapgen_helper.mapgen_vm_data_param2()
+	local data_changed = false
+
+	local eminp = {x=minp.x, y=area.MinEdge.y, z=minp.z}
+	local emaxp = {x=maxp.x, y=area.MaxEdge.y, z=maxp.z}
+	local minp_y = minp.y
+	local maxp_y = maxp.y
+	
+	local humiditymap = minetest.get_mapgen_object("humiditymap")
+	local nvals_cracks = mapgen_helper.perlin2d("df_cavern:cracks", minp, maxp, df_caverns.np_cracks)
+
+	local previous_y = eminp.y-1
+	
+	local previous_potential_floor_vi
+	local previous_potential_floor_y
+	local previous_node
+	
+	for vi, x, y, z in area:iterp_yxz(eminp, emaxp) do
+		
+		if y < previous_y then
+			-- we've started a new column, initialize everything
+			previous_potential_floor_vi = nil
+			previous_potential_floor_y = nil
+			previous_node = nil
+		end
+		previous_y = y
+		
+		local current_node = data[vi]
+		if previous_node and y < y_max then
+			if current_node == c_air and previous_node == c_stone then
+				-- this may be a floor, but only if we eventually hit a ceiling in this column
+				previous_potential_floor_vi = vi-area.ystride
+				previous_potential_floor_y = y-1
+			elseif current_node == c_stone and previous_node == c_air and previous_potential_floor_vi then
+				-- we hit a ceiling after passing through a floor
+				local index2d = mapgen_helper.index2d(minp, maxp, x, z)
+				local humidity = humiditymap[index2d]
+				if previous_potential_floor_y <= maxp_y and previous_potential_floor_y >= minp_y then
+					data_changed = true
+					df_caverns.tunnel_floor(minp, maxp, area, previous_potential_floor_vi, nvals_cracks, data, data_param2, humidity > 30)
+				end
+				if y <= maxp_y and y >= minp_y then
+					data_changed = true
+					df_caverns.tunnel_ceiling(minp, maxp, area, vi, nvals_cracks, data, data_param2, humidity > 30)
+				end
+				previous_potential_floor_vi = nil
+			elseif not mapgen_helper.buildable_to(current_node) then
+				-- we've entered a non-stone ceiling of some kind. Abort potential floor-ceiling pair detection.
+				previous_potential_floor_vi = nil
+			end
+		end
+		previous_node = current_node
+		
+	end
+	
+	if data_changed then
+		--send data back to voxelmanip
+		vm:set_data(data)
+		vm:set_param2_data(data_param2)
+		--calc lighting
+		vm:set_lighting({day = 0, night = 0})
+		vm:calc_lighting()
+	
+		vm:update_liquids()
+		--write it to world
+		vm:write_to_map()
+	end
+	
+	local time_taken = os.clock() - t_start -- how long this chunk took, in seconds
+	mapgen_helper.record_time("df_caverns surface tunnels", time_taken)
+end)