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Epic/mods/nether/mapgen.lua

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--[[
Nether mod for minetest
Copyright (C) 2013 PilzAdam
Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.
]]--
-- Parameters
local NETHER_CEILING = nether.DEPTH_CEILING
local NETHER_FLOOR = nether.DEPTH_FLOOR
local TCAVE = 0.6
local BLEND = 128
-- Stuff
local math_max, math_min, math_abs, math_floor = math.max, math.min, math.abs, math.floor -- avoid needing table lookups each time a common math function is invoked
if minetest.read_schematic == nil then
-- Using biomes to create the Nether requires the ability for biomes to set "node_cave_liquid = air".
-- This feature was introduced by paramat in b1b40fef1 on 2019-05-19, but we can't test for
-- it directly. However b2065756c was merged a few months later (in 2019-08-14) and it is easy
-- to directly test for - it adds minetest.read_schematic() - so we use this as a proxy-test
-- for whether the Minetest engine is recent enough to have implemented node_cave_liquid=air
error("This " .. nether.modname .. " mapgen requires Minetest v5.1 or greater, use mapgen_nobiomes.lua instead.", 0)
end
local function override_underground_biomes()
-- https://forum.minetest.net/viewtopic.php?p=257522#p257522
-- Q: Is there a way to override an already-registered biome so I can get it out of the
-- way of my own underground biomes without disturbing the other biomes registered by
-- default?
-- A: No, all you can do is use a mod to clear all biomes then re-register the complete
-- set but with your changes. It has been described as hacky but this is actually the
-- official way to alter biomes, most mods and subgames would want to completely change
-- all biomes anyway.
-- To avoid the engine side of mapgen becoming overcomplex the approach is to require mods
-- to do slightly more complex stuff in Lua.
-- take a copy of all biomes, decorations, and ores. Regregistering a biome changes its ID, so
-- any decorations or ores using the 'biomes' field must afterwards be cleared and re-registered.
-- https://github.com/minetest/minetest/issues/9288
local registered_biomes_copy = {}
local registered_decorations_copy = {}
local registered_ores_copy = {}
for old_biome_key, old_biome_def in pairs(minetest.registered_biomes) do
registered_biomes_copy[old_biome_key] = old_biome_def
end
for old_decoration_key, old_decoration_def in pairs(minetest.registered_decorations) do
registered_decorations_copy[old_decoration_key] = old_decoration_def
end
for old_ore_key, old_ore_def in pairs(minetest.registered_ores) do
registered_ores_copy[old_ore_key] = old_ore_def
end
-- clear biomes, decorations, and ores
minetest.clear_registered_decorations()
minetest.clear_registered_ores()
minetest.clear_registered_biomes()
-- Restore biomes, adjusted to not overlap the Nether
for biome_key, new_biome_def in pairs(registered_biomes_copy) do
local biome_y_max, biome_y_min = tonumber(new_biome_def.y_max), tonumber(new_biome_def.y_min)
if biome_y_max > NETHER_FLOOR and biome_y_min < NETHER_CEILING then
-- This biome occupies some or all of the depth of the Nether, shift/crop it.
local spaceOccupiedAbove = biome_y_max - NETHER_CEILING
local spaceOccupiedBelow = NETHER_FLOOR - biome_y_min
if spaceOccupiedAbove >= spaceOccupiedBelow or biome_y_min <= -30000 then
-- place the biome above the Nether
-- We also shift biomes which extend to the bottom of the map above the Nether, since they
-- likely only extend that deep as a catch-all, and probably have a role nearer the surface.
new_biome_def.y_min = NETHER_CEILING + 1
new_biome_def.y_max = math_max(biome_y_max, NETHER_CEILING + 2)
else
-- shift the biome to below the Nether
new_biome_def.y_max = NETHER_FLOOR - 1
new_biome_def.y_min = math_min(biome_y_min, NETHER_CEILING - 2)
end
end
minetest.register_biome(new_biome_def)
end
-- Restore biome decorations
for decoration_key, new_decoration_def in pairs(registered_decorations_copy) do
minetest.register_decoration(new_decoration_def)
end
-- Restore biome ores
for ore_key, new_ore_def in pairs(registered_ores_copy) do
minetest.register_ore(new_ore_def)
end
end
-- Shift any overlapping biomes out of the way before we create the Nether biomes
override_underground_biomes()
-- nether:native_mapgen is used to prevent ores and decorations being generated according
-- to landforms created by the native mapgen.
-- Ores and decorations are registered against "nether:rack" instead, and the lua
-- on_generate() callback will carve the Nether with nether:rack before invoking
-- generate_decorations and generate_ores.
minetest.register_node("nether:native_mapgen", {})
minetest.register_biome({
name = "nether_caverns",
node_stone = "nether:native_mapgen", -- nether:native_mapgen is used here to prevent the native mapgen from placing ores and decorations.
node_filler = "nether:native_mapgen", -- The lua on_generate will transform nether:rack_native into nether:rack then decorate and add ores.
node_dungeon = "nether:brick",
node_dungeon_alt = "nether:brick_cracked",
node_dungeon_stair = "stairs:stair_nether_brick",
-- Setting node_cave_liquid to "air" avoids the need to filter lava and water out of the mapchunk and
-- surrounding shell (overdraw nodes beyond the mapchunk).
-- This feature was introduced by paramat in b1b40fef1 on 2019-05-19, and this mapgen.lua file should only
-- be run if the Minetest version includes it. The earliest tag made after 2019-05-19 is 5.1.0 on 2019-10-13,
-- however we shouldn't test version numbers. minetest.read_schematic() was added by b2065756c and merged in
-- 2019-08-14 and is easy to test for, we don't use it but it should make a good proxy-test for whether the
-- Minetest version is recent enough to have implemented node_cave_liquid=air
node_cave_liquid = "air",
y_max = NETHER_CEILING,
y_min = NETHER_FLOOR,
vertical_blend = 0,
heat_point = 50,
humidity_point = 50,
})
-- Ores and decorations
dofile(nether.path .. "/mapgen_decorations.lua")
minetest.register_ore({
ore_type = "scatter",
ore = "nether:glowstone",
wherein = "nether:rack",
clust_scarcity = 11 * 11 * 11,
clust_num_ores = 3,
clust_size = 2,
y_max = NETHER_CEILING,
y_min = NETHER_FLOOR,
})
minetest.register_ore({
ore_type = "scatter",
ore = "nether:lava_crust",
wherein = "nether:basalt",
clust_scarcity = 16 * 16 * 16,
clust_num_ores = 3,
clust_size = 2,
y_max = NETHER_CEILING,
y_min = NETHER_FLOOR,
})
minetest.register_ore({
ore_type = "scatter",
ore = "default:lava_source",
wherein = {"nether:rack", "nether:basalt"},
clust_scarcity = 32 * 32 * 32,
clust_num_ores = 4,
clust_size = 2,
y_max = NETHER_CEILING,
y_min = NETHER_FLOOR,
})
minetest.register_ore({
ore_type = "scatter",
ore = "epic:stone_with_titanium",
wherein = {"nether:rack"},
clust_scarcity = 20 * 20 * 20,
clust_num_ores = 6,
clust_size = 2,
y_max = NETHER_CEILING,
y_min = NETHER_FLOOR,
})
minetest.register_ore({
ore_type = "scatter",
ore = "epic:nether_with_gold",
wherein = {"nether:rack"},
clust_scarcity = 16 * 16 * 16,
clust_num_ores = 12,
clust_size = 4,
y_max = NETHER_CEILING,
y_min = NETHER_FLOOR,
})
minetest.register_ore({
ore_type = "scatter",
ore = "epic:nether_with_diamond",
wherein = {"nether:rack"},
clust_scarcity = 17 * 17 * 17,
clust_num_ores = 12,
clust_size = 4,
y_max = NETHER_CEILING,
y_min = NETHER_FLOOR,
})
minetest.register_ore({
ore_type = "blob",
ore = "nether:sand",
wherein = "nether:rack",
clust_scarcity = 14 * 14 * 14,
clust_size = 8,
y_max = NETHER_CEILING,
y_min = NETHER_FLOOR
})
-- Mapgen
-- 3D noise
local np_cave = {
offset = 0,
scale = 1,
spread = {x = 384, y = 128, z = 384}, -- squashed 3:1
seed = 59033,
octaves = 5,
persist = 0.7,
lacunarity = 2.0,
--flags = ""
}
-- Buffers and objects we shouldn't recreate every on_generate
local nobj_cave = nil
local nbuf_cave = {}
local dbuf = {}
local yblmin = NETHER_FLOOR + BLEND * 2
local yblmax = NETHER_CEILING - BLEND * 2
-- Content ids
local c_air = minetest.get_content_id("air")
local c_netherrack = minetest.get_content_id("nether:rack")
local c_dungeonbrick = minetest.get_content_id("nether:brick")
local c_dungeonbrick_alt = minetest.get_content_id("nether:brick_cracked")
local c_netherbrick_slab = minetest.get_content_id("stairs:slab_nether_brick")
local c_netherfence = minetest.get_content_id("nether:fence_nether_brick")
local c_glowstone = minetest.get_content_id("nether:glowstone")
local c_lava_source = minetest.get_content_id("default:lava_source")
local c_lavasea_source = minetest.get_content_id("nether:lava_source") -- same as lava but with staggered animation to look better as an ocean
local c_lava_crust = minetest.get_content_id("nether:lava_crust")
local c_basalt = minetest.get_content_id("nether:basalt")
local c_native_mapgen = minetest.get_content_id("nether:native_mapgen")
local c_debug = minetest.get_content_id("default:glass")
-- Dungeon excavation functions
function is_dungeon_brick(node_id)
return node_id == c_dungeonbrick or node_id == c_dungeonbrick_alt
end
function build_dungeon_room_list(data, area)
local result = {}
-- Unfortunately gennotify only returns dungeon rooms, not corridors.
-- We don't need to check for temples because only dungeons are generated in biomes
-- that define their own dungeon nodes.
local gennotify = minetest.get_mapgen_object("gennotify")
local roomLocations = gennotify["dungeon"] or {}
-- Excavation should still know to stop if a cave or corridor has removed the dungeon wall.
-- See MapgenBasic::generateDungeons in mapgen.cpp for max room sizes.
local maxRoomSize = 18
local maxRoomRadius = math.ceil(maxRoomSize / 2)
local xStride, yStride, zStride = 1, area.ystride, area.zstride
local minEdge, maxEdge = area.MinEdge, area.MaxEdge
for _, roomPos in ipairs(roomLocations) do
if area:containsp(roomPos) then -- this safety check does not appear to be necessary, but lets make it explicit
local room_vi = area:indexp(roomPos)
--data[room_vi] = minetest.get_content_id("default:torch") -- debug
local startPos = vector.new(roomPos)
if roomPos.y + 1 <= maxEdge.y and data[room_vi + yStride] == c_air then
-- The roomPos coords given by gennotify are at floor level, but whenever possible we
-- want to be performing searches a node higher than floor level to avoids dungeon chests.
startPos.y = startPos.y + 1
room_vi = area:indexp(startPos)
end
local bound_min_x = math_max(minEdge.x, roomPos.x - maxRoomRadius)
local bound_min_y = math_max(minEdge.y, roomPos.y - 1) -- room coords given by gennotify are on the floor
local bound_min_z = math_max(minEdge.z, roomPos.z - maxRoomRadius)
local bound_max_x = math_min(maxEdge.x, roomPos.x + maxRoomRadius)
local bound_max_y = math_min(maxEdge.y, roomPos.y + maxRoomSize) -- room coords given by gennotify are on the floor
local bound_max_z = math_min(maxEdge.z, roomPos.z + maxRoomRadius)
local room_min = vector.new(startPos)
local room_max = vector.new(startPos)
local vi = room_vi
while room_max.y < bound_max_y and data[vi + yStride] == c_air do
room_max.y = room_max.y + 1
vi = vi + yStride
end
vi = room_vi
while room_min.y > bound_min_y and data[vi - yStride] == c_air do
room_min.y = room_min.y - 1
vi = vi - yStride
end
vi = room_vi
while room_max.z < bound_max_z and data[vi + zStride] == c_air do
room_max.z = room_max.z + 1
vi = vi + zStride
end
vi = room_vi
while room_min.z > bound_min_z and data[vi - zStride] == c_air do
room_min.z = room_min.z - 1
vi = vi - zStride
end
vi = room_vi
while room_max.x < bound_max_x and data[vi + xStride] == c_air do
room_max.x = room_max.x + 1
vi = vi + xStride
end
vi = room_vi
while room_min.x > bound_min_x and data[vi - xStride] == c_air do
room_min.x = room_min.x - 1
vi = vi - xStride
end
local roomInfo = vector.new(roomPos)
roomInfo.minp = room_min
roomInfo.maxp = room_max
result[#result + 1] = roomInfo
end
end
return result;
end
-- Only partially excavates dungeons, the rest is left as an exercise for the player ;)
-- (Corridors and the parts of rooms which extend beyond the emerge boundary will remain filled)
function excavate_dungeons(data, area, rooms)
local vi, node_id
-- any air from the native mapgen has been replaced by netherrack, but
-- we don't want this inside dungeons, so fill dungeon rooms with air
for _, roomInfo in ipairs(rooms) do
local room_min = roomInfo.minp
local room_max = roomInfo.maxp
for z = room_min.z, room_max.z do
for y = room_min.y, room_max.y do
vi = area:index(room_min.x, y, z)
for x = room_min.x, room_max.x do
node_id = data[vi]
if node_id == c_netherrack or node_id == c_basalt then data[vi] = c_air end
vi = vi + 1
end
end
end
end
end
-- Since we already know where all the rooms and their walls are, and have all the nodes stored
-- in a voxelmanip already, we may as well add a little Nether flair to the dungeons found here.
function decorate_dungeons(data, area, rooms)
local xStride, yStride, zStride = 1, area.ystride, area.zstride
local minEdge, maxEdge = area.MinEdge, area.MaxEdge
for _, roomInfo in ipairs(rooms) do
local room_min, room_max = roomInfo.minp, roomInfo.maxp
local room_size = vector.distance(room_min, room_max)
if room_size > 10 then
local room_seed = roomInfo.x + 3 * roomInfo.z + 13 * roomInfo.y
local window_y = roomInfo.y + math_min(2, room_max.y - roomInfo.y - 1)
if room_seed % 3 == 0 and room_max.y < maxEdge.y then
-- Glowstone chandelier (feel free to replace with a fancy schematic)
local vi = area:index(roomInfo.x, room_max.y + 1, roomInfo.z)
if is_dungeon_brick(data[vi]) then data[vi] = c_glowstone end
elseif room_seed % 4 == 0 and room_min.y > minEdge.y
and room_min.x > minEdge.x and room_max.x < maxEdge.x
and room_min.z > minEdge.z and room_max.z < maxEdge.z then
-- lava well (feel free to replace with a fancy schematic)
local vi = area:index(roomInfo.x, room_min.y, roomInfo.z)
if is_dungeon_brick(data[vi - yStride]) then
data[vi - yStride] = c_lava_source
if data[vi - zStride] == c_air then data[vi - zStride] = c_netherbrick_slab end
if data[vi + zStride] == c_air then data[vi + zStride] = c_netherbrick_slab end
if data[vi - xStride] == c_air then data[vi - xStride] = c_netherbrick_slab end
if data[vi + xStride] == c_air then data[vi + xStride] = c_netherbrick_slab end
end
end
-- Barred windows
if room_seed % 7 < 5 and room_max.x - room_min.x >= 4 and room_max.z - room_min.z >= 4
and window_y >= minEdge.y and window_y + 1 <= maxEdge.y
and room_min.x > minEdge.x and room_max.x < maxEdge.x
and room_min.z > minEdge.z and room_max.z < maxEdge.z then
--data[area:indexp(roomInfo)] = minetest.get_content_id("default:mese_post_light") -- debug
-- Until whisper glass is added, every window will be made of netherbrick fence (rather
-- than material depending on room_seed)
local window_node = c_netherfence
local vi_min = area:index(room_min.x - 1, window_y, roomInfo.z)
local vi_max = area:index(room_max.x + 1, window_y, roomInfo.z)
local locations = {-zStride, zStride, -zStride + yStride, zStride + yStride}
for _, offset in ipairs(locations) do
if is_dungeon_brick(data[vi_min + offset]) then data[vi_min + offset] = window_node end
if is_dungeon_brick(data[vi_max + offset]) then data[vi_max + offset] = window_node end
end
vi_min = area:index(roomInfo.x, window_y, room_min.z - 1)
vi_max = area:index(roomInfo.x, window_y, room_max.z + 1)
locations = {-xStride, xStride, -xStride + yStride, xStride + yStride}
for _, offset in ipairs(locations) do
if is_dungeon_brick(data[vi_min + offset]) then data[vi_min + offset] = window_node end
if is_dungeon_brick(data[vi_max + offset]) then data[vi_max + offset] = window_node end
end
end
-- Weeds on the floor once Nether weeds are added
end
end
end
local REGION_BUFFER_THICKNESS = 0.2
local CENTER_REGION_LIMIT = TCAVE - REGION_BUFFER_THICKNESS
local BASALT_LIMIT = CENTER_REGION_LIMIT - 0.1
local SURFACE_CRUST_LIMIT = BASALT_LIMIT * 0.25
local CRUST_LIMIT = BASALT_LIMIT * 0.85
-- Returns (absolute height, fractional distance from ceiling or sea floor)
-- the fractional distance from ceiling or sea floor is a value between 0 and 1 (inclusive)
-- Note it may find the most relevent sea-level - not necesssarily the one you are closest
-- to, since the space above the sea reaches much higher than the depth below the sea.
local function find_nearest_lava_sealevel(y)
-- todo: put oceans near the bottom of chunks to improve ability to generate tunnels to the center
-- todo: constrain y to be not near the bounds of the nether
-- todo: add some random adj at each level, seeded only by the level height
local sealevel = math.floor((y + 100) / 200) * 200
local cavern_limits_fraction
local height_above_sea = y - sealevel
if height_above_sea >= 0 then
cavern_limits_fraction = math_min(1, height_above_sea / 95)
else
-- approaches 1 much faster as the lava sea is shallower than the cavern above it
cavern_limits_fraction = math_min(1, -height_above_sea / 40)
end
return sealevel, cavern_limits_fraction
end
local caveperlin
minetest.register_chatcommand("whereami",
{
description = "Describes which region of the nether the player is in",
func = function(name, param)
local player = minetest.get_player_by_name(name)
if player == nil then return false, "Unknown player position" end
local pos = vector.round(player:get_pos())
if pos.y > NETHER_CEILING or pos.y < NETHER_FLOOR then
return true, "The Overworld"
end
caveperlin = caveperlin or minetest.get_perlin(np_cave)
local densityNoise = caveperlin:get_3d(pos)
local sea_level, cavern_limit_distance = find_nearest_lava_sealevel(pos.y)
local desc
if densityNoise > 0.6 then
desc = "Positive nether"
elseif densityNoise < -0.6 then
desc = "Negative nether"
elseif math_abs(densityNoise) < CENTER_REGION_LIMIT then
desc = "Nether Core"
local cavern_noise_adj = CENTER_REGION_LIMIT * (cavern_limit_distance * cavern_limit_distance * cavern_limit_distance)
if math_abs(densityNoise) + cavern_noise_adj < BASALT_LIMIT then
desc = desc .. " inside cavern"
else
desc = desc .. " but outside cavern"
end
elseif densityNoise > 0 then
desc = "Shell between positive nether and center region"
else
desc = "Shell between negative nether and center region"
end
local sea_pos = pos.y - sea_level
if sea_pos > 0 then
desc = desc .. ", " .. sea_pos .. "m above lava-sea level"
else
desc = desc .. ", " .. sea_pos .. "m below lava-sea level"
end
return true, "[Perlin " .. (math_floor(densityNoise * 1000) / 1000) .. "] " .. desc
end
}
)
function draw_pathway(data, area, nether_pos, center_pos)
local dist = math_floor(vector.distance(nether_pos, center_pos))
local step = vector.subtract(center_pos, nether_pos)
local ystride = area.ystride
local zstride = area.zstride
-- first pass: record path details
local linedata = {}
local last_pos = {}
local line_index = 1
local first_filled_index, boundary_index, last_filled_index
for i = 0, dist do
pos = vector.round(vector.add(nether_pos, vector.multiply(step, i / dist))) -- bresenham's line would be good here, but too much lua code
if not vector.equals(pos, last_pos) then
local vi = area:indexp(pos)
local node_id = data[vi]
linedata[line_index] = {
pos = pos,
vi = vi,
node_id = node_id
}
if boundary_index == nil and node_id == c_basalt then boundary_index = line_index end
if node_id == c_air then
if boundary_index ~= nil and last_filled_index == nil then last_filled_index = line_index end
else
if first_filled_index == nil then first_filled_index = line_index end
end
line_index = line_index + 1
last_pos = pos
end
end
first_filled_index = first_filled_index or 1
last_filled_index = last_filled_index or #linedata
boundary_index = boundary_index or last_filled_index
--minetest.chat_send_all((last_filled_index - first_filled_index) .. " instead of " .. dist .. ", with steps reduced to " .. #linedata)
-- second pass: excavate
-- excavation radius should be limited to half the sampling distance so we don't end up
-- exceeding minp-maxp and having excavation filled in when the next chunk is generated.
local start_index, stop_index = math_max(1, first_filled_index - 4), math_min(#linedata, last_filled_index + 4)
for i = start_index, stop_index do
local vi = linedata[i].vi
local radius_squared = 26.5 - 3 * (i / (stop_index - start_index + 1))
for x = -5, 5 do
for y = -5, 5 do
if x * x + y * y < radius_squared then
data[vi + y * ystride + x] = c_air
data[vi + y * ystride + x * zstride] = c_air
data[vi + y * zstride + x] = c_air
end
end
end
end
-- thrid pass: decorate
--for i = start_index, stop_index do data[linedata[i].vi] = c_glowstone end
-- add glowstone to make tunnels easyier to find
local vi = linedata[boundary_index].vi
local glowcount = 0
for x = -6, 6 do
for y = -6, 6 do
if glowcount > 3 then break end
local radius_squared = x * x + y * y
if radius_squared < 27 and radius_squared >= 25 then
if data[vi + y * ystride + x] ~= c_air then data[vi + y * ystride + x] = c_glowstone glowcount = glowcount + 1 end
if data[vi + y * ystride + x * zstride] ~= c_air then data[vi + y * ystride + x * zstride] = c_glowstone glowcount = glowcount + 1 end
if data[vi + y * zstride + x] ~= c_air then data[vi + y * zstride + x] = c_glowstone glowcount = glowcount + 1 end
end
end
end
end
function excavate_tunnel_to_center_of_the_nether(data, area, nvals_cave, minp, maxp)
local extent = vector.subtract(maxp, minp)
local skip = 10 -- sampling rate of 1 in 10
local highest = -1000
local lowest = 1000
local lowest_vi
local highest_vi
local yCaveStride = maxp.x - minp.x + 1
local zCaveStride = yCaveStride * yCaveStride
local vi_offset = area:indexp(vector.add(minp, math_floor(skip / 2))) -- start half the sampling distance away from minp
local vi, ni
for y = 0, extent.y - 1, skip do
local sealevel = find_nearest_lava_sealevel(minp.y + y)
if minp.y + y > sealevel then -- only create tunnels above sea level
for z = 0, extent.z - 1, skip do
vi = vi_offset + y * area.ystride + z * area.zstride + 1
ni = z * zCaveStride + y * yCaveStride + 1
for x = 0, extent.x - 1, skip do
local noise = math_abs(nvals_cave[ni])
if noise < lowest then
lowest = noise
lowest_vi = vi
end
if noise > highest then
highest = noise
highest_vi = vi
end
ni = ni + skip
vi = vi + skip
end
end
end
end
if lowest < BASALT_LIMIT and highest > TCAVE + 0.03 then
local sealevel, cavern_limit_distance = find_nearest_lava_sealevel(area:position(lowest_vi).y)
local cavern_noise_adj = CENTER_REGION_LIMIT * (cavern_limit_distance * cavern_limit_distance * cavern_limit_distance)
if lowest + cavern_noise_adj < BASALT_LIMIT then
draw_pathway(data, area, area:position(highest_vi), area:position(lowest_vi))
end
end
end
local pathway_chunk_count = 0
local total_chunk_count = 0
-- On-generated function
local function on_generated(minp, maxp, seed)
if minp.y > NETHER_CEILING or maxp.y < NETHER_FLOOR then
return
end
local vm, emerge_min, emerge_max = minetest.get_mapgen_object("voxelmanip")
local area = VoxelArea:new{MinEdge=emerge_min, MaxEdge=emerge_max}
local data = vm:get_data(dbuf)
local x0, y0, z0 = minp.x, math_max(minp.y, NETHER_FLOOR), minp.z
local x1, y1, z1 = maxp.x, math_min(maxp.y, NETHER_CEILING), maxp.z
local yCaveStride = x1 - x0 + 1
local zCaveStride = yCaveStride * yCaveStride
local chulens = {x = yCaveStride, y = yCaveStride, z = yCaveStride}
nobj_cave = nobj_cave or minetest.get_perlin_map(np_cave, chulens)
local nvals_cave = nobj_cave:get_3d_map_flat(minp, nbuf_cave)
local dungeonRooms = build_dungeon_room_list(data, area)
local abs_cave_noise, abs_cave_noise_adjusted
local contains_nether = false
local contains_shell = false
local contains_center = false
local contains_ocean = false
for y = y0, y1 do -- Y loop first to minimise tcave & lava-sea calculations
local tcave = TCAVE
if y > yblmax then tcave = TCAVE + ((y - yblmax) / BLEND) ^ 2 end
if y < yblmin then tcave = TCAVE + ((yblmin - y) / BLEND) ^ 2 end
local sea_level, cavern_limit_distance = find_nearest_lava_sealevel(y)
local above_lavasea = y > sea_level
local below_lavasea = y < sea_level
local cavern_noise_adj = CENTER_REGION_LIMIT * (cavern_limit_distance * cavern_limit_distance * cavern_limit_distance)
for z = z0, z1 do
local vi = area:index(x0, y, z) -- Initial voxelmanip index
local ni = (z - z0) * zCaveStride + (y - y0) * yCaveStride + 1
for x = x0, x1 do
local id = data[vi] -- Existing node
local cave_noise = nvals_cave[ni]
if cave_noise > tcave then
-- prime region
data[vi] = c_air
contains_nether = true
elseif -cave_noise > tcave then
-- secondary/spare region
data[vi] = c_air
else
-- netherrack walls and/or center region
abs_cave_noise = math_abs(cave_noise)
-- abs_cave_noise_adjusted makes the center region smaller as distance from the lava ocean
-- increases, we do this by pretending the abs_cave_noise value is higher.
abs_cave_noise_adjusted = abs_cave_noise + cavern_noise_adj
if above_lavasea and abs_cave_noise_adjusted < BASALT_LIMIT then
data[vi] = c_air
contains_center = true
elseif abs_cave_noise_adjusted < SURFACE_CRUST_LIMIT or (below_lavasea and abs_cave_noise_adjusted < CRUST_LIMIT) then
data[vi] = c_lavasea_source
contains_ocean = true
elseif abs_cave_noise_adjusted < BASALT_LIMIT then
data[vi] = c_lava_crust
contains_ocean = true
elseif id == c_air or id == c_native_mapgen then
if abs_cave_noise < CENTER_REGION_LIMIT then
data[vi] = c_basalt
else
-- the shell seperating the basalt realm from the rest of the nether...
-- put some holes in it
data[vi] = c_netherrack -- excavate_dungeons() will mostly reverse this inside dungeons
contains_shell = true
end
end
end
ni = ni + 1
vi = vi + 1
end
end
end
total_chunk_count = total_chunk_count + 1
if contains_nether and contains_shell and contains_center and contains_ocean then
pathway_chunk_count = pathway_chunk_count + 1
end
--if total_chunk_count % 50 == 0 then
-- minetest.chat_send_all(pathway_chunk_count .. " of " .. total_chunk_count .. " chunks contain both nether and lava-sea (" .. math_floor(pathway_chunk_count * 100 / total_chunk_count) .. "%)")
--end
if contains_nether and contains_center then
excavate_tunnel_to_center_of_the_nether(data, area, nvals_cave, minp, maxp)
end
-- any air from the native mapgen has been replaced by netherrack, but we
-- don't want netherrack inside dungeons, so fill known dungeon rooms with air.
excavate_dungeons(data, area, dungeonRooms)
decorate_dungeons(data, area, dungeonRooms)
vm:set_data(data)
minetest.generate_ores(vm)
-- avoid generating decorations on the underside of the bottom of the nether
if minp.y > NETHER_FLOOR and maxp.y < NETHER_CEILING then minetest.generate_decorations(vm) end
vm:set_lighting({day = 0, night = 0}, minp, maxp)
vm:calc_lighting()
vm:update_liquids()
vm:write_to_map()
end
-- use knowledge of the nether mapgen algorithm to return a suitable ground level for placing a portal.
function nether.find_nether_ground_y(target_x, target_z, start_y)
local nobj_cave_point = minetest.get_perlin(np_cave)
local air = 0 -- Consecutive air nodes found
for y = start_y, math_max(NETHER_FLOOR + BLEND, start_y - 4096), -1 do
local nval_cave = nobj_cave_point:get3d({x = target_x, y = y, z = target_z})
if nval_cave > TCAVE then -- Cavern
air = air + 1
else -- Not cavern, check if 4 nodes of space above
if air >= 4 then
-- Check volume for non-natural nodes
local minp = {x = target_x - 1, y = y , z = target_z - 2}
local maxp = {x = target_x + 2, y = y + 4, z = target_z + 2}
if nether.volume_is_natural(minp, maxp) then
return y + 1
else -- Restart search a little lower
nether.find_nether_ground_y(target_x, target_z, y - 16)
end
else -- Not enough space, reset air to zero
air = 0
end
end
end
return math_max(start_y, NETHER_FLOOR + BLEND) -- Fallback
end
-- We don't need to be gen-notified of temples because only dungeons will be generated
-- if a biome defines the dungeon nodes
minetest.set_gen_notify({dungeon = true})
minetest.register_on_generated(on_generated)
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