VoxeLibre/mods/MISC/findbiome/init.lua

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local S = minetest.get_translator(minetest.get_current_modname())
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local mod_biomeinfo = minetest.get_modpath("biomeinfo")
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local mg_name = minetest.get_mapgen_setting("mg_name")
local water_level = tonumber(minetest.get_mapgen_setting("water_level"))
-- Calculate the maximum playable limit
local mapgen_limit = tonumber(minetest.get_mapgen_setting("mapgen_limit"))
local chunksize = tonumber(minetest.get_mapgen_setting("chunksize"))
local playable_limit = math.max(mapgen_limit - (chunksize + 1) * 16, 0)
-- Parameters
-------------
-- Resolution of search grid in nodes.
local res = 64
-- Number of points checked in the square search grid (edge * edge).
local checks = 128 * 128
-- End of parameters
--------------------
-- Direction table
local dirs = {
{x = 0, y = 0, z = 1},
{x = -1, y = 0, z = 0},
{x = 0, y = 0, z = -1},
{x = 1, y = 0, z = 0},
}
-- Returns true if pos is within the world boundaries
local function is_in_world(pos)
return not (math.abs(pos.x) > playable_limit or math.abs(pos.y) > playable_limit or math.abs(pos.z) > playable_limit)
end
-- Checks if pos is within the biome's boundaries. If it isn't, places pos inside the boundaries.
local function adjust_pos_to_biome_limits(pos, biome_id)
local bpos = table.copy(pos)
local biome_name = minetest.get_biome_name(biome_id)
local biome = minetest.registered_biomes[biome_name]
if not biome then
minetest.log("error", "[findbiome] adjust_pos_to_biome_limits non-existing biome!")
return bpos, true
end
local axes = {"y", "x", "z"}
local out_of_bounds = false
for a=1, #axes do
local ax = axes[a]
local min, max
if biome[ax.."_min"] then
min = biome[ax.."_min"]
else
min = -playable_limit
end
if biome[ax.."_max"] then
max = biome[ax.."_max"]
else
max = playable_limit
end
min = tonumber(min)
max = tonumber(max)
if bpos[ax] < min then
out_of_bounds = true
bpos[ax] = min
if max-min > 16 then
bpos[ax] = math.max(bpos[ax] + 8, -playable_limit)
end
end
if bpos[ax] > max then
out_of_bounds = true
bpos[ax] = max
if max-min > 16 then
bpos[ax] = math.min(bpos[ax] - 8, playable_limit)
end
end
end
return bpos, out_of_bounds
end
-- Find the special default biome
local function find_default_biome()
local all_biomes = minetest.registered_biomes
local biome_count = 0
for b, biome in pairs(all_biomes) do
biome_count = biome_count + 1
end
-- Trivial case: No biomes registered, default biome is everywhere.
if biome_count == 0 then
local y = minetest.get_spawn_level(0, 0)
if not y then
y = 0
end
return { x = 0, y = y, z = 0 }
end
local pos = {}
-- Just check a lot of random positions
-- It's a crappy algorithm but better than nothing.
for i=1, 100 do
pos.x = math.random(-playable_limit, playable_limit)
pos.y = math.random(-playable_limit, playable_limit)
pos.z = math.random(-playable_limit, playable_limit)
local biome_data = minetest.get_biome_data(pos)
if biome_data and minetest.get_biome_name(biome_data.biome) == "default" then
return pos
end
end
return nil
end
local function find_biome(pos, biomes)
pos = vector.round(pos)
-- Pos: Starting point for biome checks. This also sets the y co-ordinate for all
-- points checked, so the suitable biomes must be active at this y.
-- Initial variables
local edge_len = 1
local edge_dist = 0
local dir_step = 0
local dir_ind = 1
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local success
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local spawn_pos
local biome_ids
-- Get next position on square search spiral
local function next_pos()
if edge_dist == edge_len then
edge_dist = 0
dir_ind = dir_ind + 1
if dir_ind == 5 then
dir_ind = 1
end
dir_step = dir_step + 1
edge_len = math.floor(dir_step / 2) + 1
end
local dir = dirs[dir_ind]
local move = vector.multiply(dir, res)
edge_dist = edge_dist + 1
return vector.add(pos, move)
end
-- Position search
local function search()
local attempt = 1
while attempt < 3 do
for iter = 1, checks do
local biome_data = minetest.get_biome_data(pos)
-- Sometimes biome_data is nil
local biome = biome_data and biome_data.biome
for id_ind = 1, #biome_ids do
local biome_id = biome_ids[id_ind]
pos = adjust_pos_to_biome_limits(pos, biome_id)
local spos = table.copy(pos)
if biome == biome_id then
local good_spawn_height = pos.y <= water_level + 16 and pos.y >= water_level
local spawn_y = minetest.get_spawn_level(spos.x, spos.z)
if spawn_y then
spawn_pos = {x = spos.x, y = spawn_y, z = spos.z}
elseif not good_spawn_height then
spawn_pos = {x = spos.x, y = spos.y, z = spos.z}
elseif attempt >= 2 then
spawn_pos = {x = spos.x, y = spos.y, z = spos.z}
end
if spawn_pos then
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local _,outside = adjust_pos_to_biome_limits(spawn_pos, biome_id)
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if is_in_world(spawn_pos) and not outside then
return true
end
end
end
end
pos = next_pos()
end
attempt = attempt + 1
end
return false
end
local function search_v6()
if not mod_biomeinfo then return
false
end
for iter = 1, checks do
local found_biome = biomeinfo.get_v6_biome(pos)
for i = 1, #biomes do
local searched_biome = biomes[i]
if found_biome == searched_biome then
local spawn_y = minetest.get_spawn_level(pos.x, pos.z)
if spawn_y then
spawn_pos = {x = pos.x, y = spawn_y, z = pos.z}
if is_in_world(spawn_pos) then
return true
end
end
end
end
pos = next_pos()
end
return false
end
if mg_name == "v6" then
success = search_v6()
else
-- Table of suitable biomes
biome_ids = {}
for i=1, #biomes do
local id = minetest.get_biome_id(biomes[i])
if not id then
return nil, false
end
table.insert(biome_ids, id)
end
success = search()
end
return spawn_pos, success
end
local mods_loaded = false
minetest.register_on_mods_loaded(function()
mods_loaded = true
end)
-- Regiver chat commands
do
minetest.register_chatcommand("findbiome", {
description = S("Find and teleport to biome"),
params = S("<biome>"),
privs = { debug = true, teleport = true },
func = function(name, param)
if not mods_loaded then
return false
end
local player = minetest.get_player_by_name(name)
if not player then
return false, S("No player.")
end
local pos = player:get_pos()
local invalid_biome = true
if mg_name == "v6" then
if not mod_biomeinfo then
return false, S("Not supported. The “biomeinfo” mod is required for v6 mapgen support!")
end
local biomes = biomeinfo.get_active_v6_biomes()
for b=1, #biomes do
if param == biomes[b] then
invalid_biome = false
break
end
end
else
if param == "default" then
local biome_pos = find_default_biome()
if biome_pos then
player:set_pos(biome_pos)
return true, S("Biome found at @1.", minetest.pos_to_string(biome_pos))
else
return false, S("No biome found!")
end
end
local id = minetest.get_biome_id(param)
if id then
invalid_biome = false
end
end
if invalid_biome then
return false, S("Biome does not exist!")
end
local biome_pos, success = find_biome(pos, {param})
if success then
player:set_pos(biome_pos)
return true, S("Biome found at @1.", minetest.pos_to_string(biome_pos))
else
return false, S("No biome found!")
end
end,
})
minetest.register_chatcommand("listbiomes", {
description = S("List all biomes"),
params = "",
privs = { debug = true },
func = function(name, param)
if not mods_loaded then
return false
end
local biomes
local b = 0
if mg_name == "v6" then
if not mod_biomeinfo then
return false, S("Not supported. The “biomeinfo” mod is required for v6 mapgen support!")
end
biomes = biomeinfo.get_active_v6_biomes()
b = #biomes
else
biomes = {}
for k,v in pairs(minetest.registered_biomes) do
table.insert(biomes, k)
b = b + 1
end
end
if b == 0 then
return true, S("No biomes.")
else
table.sort(biomes)
for b=1, #biomes do
minetest.chat_send_player(name, biomes[b])
end
return true
end
end,
})
end