many worldgen mods and gonna try technic now

mods/dfcaverns/mapgen_helper/init.lua

@@ -0,0 +1,84 @@
+mapgen_helper = {}
+
+mapgen_helper.mapgen_seed = tonumber(minetest.get_mapgen_setting("seed"))
+
+-- The "sidelen" used in almost every mapgen
+mapgen_helper.block_size = tonumber(minetest.get_mapgen_setting("chunksize")) * 16
+
+local MP = minetest.get_modpath(minetest.get_current_modname())
+dofile(MP.."/bounding_boxes.lua")
+dofile(MP.."/random.lua")
+dofile(MP.."/voxelarea_iterator.lua")
+dofile(MP.."/voxeldata.lua")
+dofile(MP.."/region_functions.lua")
+dofile(MP.."/lines.lua")
+dofile(MP.."/place_schematic.lua")
+dofile(MP.."/noise_manager.lua")
+dofile(MP.."/metrics.lua")
+dofile(MP.."/log_location.lua")
+
+local map_data = {}
+local map_param2_data = {}
+
+mapgen_helper.mapgen_vm_data = function()
+	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+	vm:get_data(map_data)
+	return vm, map_data, VoxelArea:new{MinEdge=emin, MaxEdge=emax}
+end
+
+mapgen_helper.mapgen_vm_data_param2 = function()
+	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+	vm:get_data(map_data)
+	vm:get_param2_data(map_param2_data)
+	return vm, map_data, map_param2_data, VoxelArea:new{MinEdge=emin, MaxEdge=emax}
+end
+
+mapgen_helper.biome_defs = nil
+mapgen_helper.get_biome_def = function(biome_id) -- given an id from the biome map, returns a biome definition.
+	if mapgen_helper.biome_defs == nil then
+		-- First time this was asked for, populate the table.
+		-- Biome registration is only done at load time so we don't have to worry about new biomes invalidating this table
+		mapgen_helper.biome_defs = {}
+		for name, desc in pairs(minetest.registered_biomes) do
+			local i = minetest.get_biome_id(desc.name)
+			mapgen_helper.biome_defs[i] = desc
+		end
+	end
+	return mapgen_helper.biome_defs[biome_id]
+end
+
+mapgen_helper.get_biome_def_i = function(biomemap, minp, maxp, area, vi)
+	if biomemap == nil then
+		return nil
+	end
+	local index2d = mapgen_helper.index2di(minp, maxp, area, vi)
+	return mapgen_helper.get_biome_def(biomemap[index2d])
+end
+
+
+-- returns whether a content ID is "buildable to"
+local buildable_to
+mapgen_helper.buildable_to = function(c_node)
+	if buildable_to then return buildable_to[c_node] end
+	buildable_to = {}
+	for k, v in pairs(minetest.registered_nodes) do
+		if v.buildable_to then
+			buildable_to[minetest.get_content_id(k)] = true
+		end
+	end
+	return buildable_to[c_node]
+end
+
+local is_ground_content = nil
+mapgen_helper.is_ground_content = function(c_node) -- If false, the cave generator will not carve through this node
+	if is_ground_content ~= nil then
+		return is_ground_content[c_node]
+	end
+	is_ground_content = {}
+	for k, v in pairs(minetest.registered_nodes) do
+		if v.is_ground_content == true then
+			is_ground_content[minetest.get_content_id(k)] = true
+		end
+	end
+	return is_ground_content[c_node]
+end