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Add biomes-based implementation of the mapgen, and decorations

Prevents the c++/native mapgen from placing ores or decorations (when useBiomes is true).
The biomes-based implementation is faster, more deterministic, and keeps its dungeons, but requires MT 5.1 features to work.

Also
 * Glowstone & Netherrack stalactites
 * Include the new decorations in mapgen_nobiomes
 * Decorate dungeons - Add windows and glowstone "chandeliers" to some rooms
 * Configurable Nether floor and ceiling depths
tags/nalc-1.2.0
Treer Treer 1 month ago
parent
commit
f4255f5d1f
5 changed files with 684 additions and 21 deletions
  1. +23
    -8
      init.lua
  2. +500
    -0
      mapgen.lua
  3. +138
    -0
      mapgen_decorations.lua
  4. +16
    -12
      mapgen_nobiomes.lua
  5. +7
    -1
      settingtypes.txt

+ 23
- 8
init.lua View File

@@ -38,25 +38,40 @@ nether = {}
nether.modname = minetest.get_current_modname()
nether.path = minetest.get_modpath(nether.modname)
nether.get_translator = S
-- nether.useBiomes allows other mods to know whether they can register ores etc. in the Nether.
-- See mapgen.lua for an explanation of why minetest.read_schematic is being checked
nether.useBiomes = minetest.get_mapgen_setting("mg_name") ~= "v6" and minetest.read_schematic ~= nil


-- Settings
nether.DEPTH = -5000 -- The y location of the Nether
nether.FASTTRAVEL_FACTOR = 8 -- 10 could be better value for Minetest, since there's no sprint, but ex-Minecraft players will be mathing for 8
nether.PORTAL_BOOK_LOOT_WEIGHTING = 0.9 -- Likelyhood of finding the Book of Portals (guide) in dungeon chests. Set to 0 to disable.
nether.NETHER_REALM_ENABLED = true -- Setting to false disables the Nether and Nether portal
nether.DEPTH_CEILING = -5000 -- The y location of the Nether's celing
nether.DEPTH_FLOOR = -11000 -- The y location of the Nether's floor
nether.FASTTRAVEL_FACTOR = 8 -- 10 could be better value for Minetest, since there's no sprint, but ex-Minecraft players will be mathing for 8
nether.PORTAL_BOOK_LOOT_WEIGHTING = 0.9 -- Likelyhood of finding the Book of Portals (guide) in dungeon chests. Set to 0 to disable.
nether.NETHER_REALM_ENABLED = true -- Setting to false disables the Nether and Nether portal


-- Override default settings with values from the .conf file, if any are present.
nether.FASTTRAVEL_FACTOR = tonumber(minetest.settings:get("nether_fasttravel_factor") or nether.FASTTRAVEL_FACTOR)
nether.PORTAL_BOOK_LOOT_WEIGHTING = tonumber(minetest.settings:get("nether_portalBook_loot_weighting") or nether.PORTAL_BOOK_LOOT_WEIGHTING)
nether.NETHER_REALM_ENABLED = minetest.settings:get_bool("nether_realm_enabled", nether.NETHER_REALM_ENABLED)
nether.DEPTH_CEILING = tonumber(minetest.settings:get("nether_depth_ymax") or nether.DEPTH_CEILING)
nether.DEPTH_FLOOR = tonumber(minetest.settings:get("nether_depth_ymin") or nether.DEPTH_FLOOR)

if nether.DEPTH_FLOOR + 1000 > nether.DEPTH_CEILING then
error("The lower limit of the Nether must be set at least 1000 lower than the upper limit, and more than 3000 is recommended. Set settingtypes.txt, or 'All Settings' -> 'Mods' -> 'nether' -> 'Nether depth'", 0)
end
nether.DEPTH = nether.DEPTH_CEILING -- Deprecated, use nether.DEPTH_CEILING instead.

-- Load files
dofile(nether.path .. "/portal_api.lua")
dofile(nether.path .. "/nodes.lua")
if nether.NETHER_REALM_ENABLED then
dofile(nether.path .. "/mapgen.lua")
if nether.useBiomes then
dofile(nether.path .. "/mapgen.lua")
else
dofile(nether.path .. "/mapgen_nobiomes.lua")
end
end
dofile(nether.path .. "/portal_examples.lua")

@@ -83,7 +98,7 @@ This opens to a truly hellish place, though for small mercies the air there is s
The expedition parties have found no diamonds or gold, and after an experienced search party failed to return from the trail of a missing expedition party, I must conclude this is a dangerous place.]], 10 * nether.FASTTRAVEL_FACTOR),

is_within_realm = function(pos) -- return true if pos is inside the Nether
return pos.y < nether.DEPTH
return pos.y < nether.DEPTH_CEILING
end,

find_realm_anchorPos = function(surface_anchorPos)
@@ -91,7 +106,7 @@ The expedition parties have found no diamonds or gold, and after an experienced
local destination_pos = vector.divide(surface_anchorPos, nether.FASTTRAVEL_FACTOR)
destination_pos.x = math.floor(0.5 + destination_pos.x) -- round to int
destination_pos.z = math.floor(0.5 + destination_pos.z) -- round to int
destination_pos.y = nether.DEPTH - 1000 -- temp value so find_nearest_working_portal() returns nether portals
destination_pos.y = nether.DEPTH_CEILING - 1000 -- temp value so find_nearest_working_portal() returns nether portals

-- a y_factor of 0 makes the search ignore the altitude of the portals (as long as they are in the Nether)
local existing_portal_location, existing_portal_orientation =
@@ -100,7 +115,7 @@ The expedition parties have found no diamonds or gold, and after an experienced
if existing_portal_location ~= nil then
return existing_portal_location, existing_portal_orientation
else
local start_y = nether.DEPTH - math.random(500, 1500) -- Search starting altitude
local start_y = nether.DEPTH_CEILING - math.random(500, 1500) -- Search starting altitude
destination_pos.y = nether.find_nether_ground_y(destination_pos.x, destination_pos.z, start_y)
return destination_pos
end


+ 500
- 0
mapgen.lua View File

@@ -0,0 +1,500 @@
--[[

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.max, math.min -- 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 = "default:mossycobble",
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 = "default:lava_source",
wherein = "nether:rack",
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 = "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 = nil
local dbuf = nil

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_netherbrick = minetest.get_content_id("nether:brick")
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_native_mapgen = minetest.get_content_id("nether:native_mapgen")


-- Dungeon excavation functions

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)

-- 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
local vi = area:index(room_min.x, y, z)
for x = room_min.x, room_max.x do
if data[vi] == c_netherrack 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
local vi = area:index(roomInfo.x, room_max.y + 1, roomInfo.z)
if data[vi] == c_netherbrick 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 data[vi - yStride] == c_netherbrick then data[vi - yStride] = c_lava_source end
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

-- 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 data[vi_min + offset] == c_netherbrick then data[vi_min + offset] = window_node end
if data[vi_max + offset] == c_netherbrick 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 data[vi_min + offset] == c_netherbrick then data[vi_min + offset] = window_node end
if data[vi_max + offset] == c_netherbrick then data[vi_max + offset] = window_node end
end
end

-- Weeds on the floor once Nether weeds are added
end
end
end


-- 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:get3dMap_flat(minp, nbuf_cave)


local dungeonRooms = build_dungeon_room_list(data, area)

for y = y0, y1 do -- Y loop first to minimise tcave 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

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

if nvals_cave[ni] > tcave then
data[vi] = c_air
elseif id == c_air or id == c_native_mapgen then
data[vi] = c_netherrack -- excavate_dungeons() will mostly reverse this inside dungeons
end

ni = ni + 1
vi = vi + 1
end
end
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)

-- 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

minetest.generate_ores(vm)
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)

+ 138
- 0
mapgen_decorations.lua View File

@@ -0,0 +1,138 @@
--[[
Register decorations for Nether mapgen
Copyright (C) 2020 Treer
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.
]]--
-- Lava is unreliable in the old Nether mapgen because it removes lava
-- from the overdraw areas, so any decorations involving lava will often
-- have the lava missing depending on whether nearby chunks were already
-- emerged or not before the decoration was placed.
local allow_lava_decorations = nether.useBiomes
local _ = {name = "air", prob = 0}
local A = {name = "air", prob = 255, force_place = true}
local G = {name = "nether:glowstone", prob = 255, force_place = true}
local N = {name = "nether:rack", prob = 255}
local S = {name = "nether:sand", prob = 255, force_place = true}
local L = {name = "default:lava_source", prob = 255, force_place = true}
-- =================
-- Stalactites
-- =================
local schematic_GlowstoneStalactite = {
size = {x = 5, y = 10, z = 5},
data = {
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, N, G, N, _,
_, N, N, N, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, G, _, _,
_, _, G, _, _,
_, G, G, G, _,
N, G, G, G, N,
N, N, G, N, N,
_, _, N, _, _, -- ypos 0, prob 25% (64/256)
_, _, G, _, _, -- ypos 1, prob 37% (96/256)
_, _, G, _, _, -- ypos 2, prob 100%
_, _, G, _, _, -- ypos 3, prob 100%
_, _, G, G, _, -- ypos 4, prob 50% (128/256) to make half of stalactites asymmetric
_, G, G, G, _, -- ypos 5, prob 75% (192/256)
_, G, G, G, _, -- ypos 6, prob 75% (192/256)
_, G, G, G, _, -- ypos 7, prob 100%
G, G, G, G, G, -- ypos 8, prob 100%
N, G, G, G, N, -- ypos 9, prob 75% (192/256)
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, G, _, _,
_, _, G, _, _,
_, _, G, _, _,
_, G, G, G, _,
N, G, G, G, N,
N, N, G, N, N,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, _, _, _, _,
_, N, G, N, _,
_, N, N, N, _
},
-- Y-slice probabilities do not function correctly for ceiling schematic
-- decorations because they are inverted, so ypos numbers have been inverted
-- to match, and a larger offset in place_offset_y should be used (e.g. -3).
yslice_prob = {
{ypos = 9, prob = 192},
{ypos = 6, prob = 192},
{ypos = 5, prob = 192},
{ypos = 4, prob = 128},
{ypos = 1, prob = 96},
{ypos = 0, prob = 64}
}
}
minetest.register_decoration({
name = "Glowstone stalactite",
deco_type = "schematic",
place_on = "nether:rack",
sidelen = 80,
fill_ratio = 0.0004,
biomes = {"nether_caverns"},
y_max = nether.DEPTH_CEILING, -- keep compatibility with mapgen_nobiomes.lua
y_min = nether.DEPTH_FLOOR,
schematic = schematic_GlowstoneStalactite,
flags = "place_center_x,place_center_z,force_placement,all_ceilings",
place_offset_y=-3
})
minetest.register_decoration({
name = "Netherrack stalactite",
deco_type = "schematic",
place_on = "nether:rack",
sidelen = 80,
fill_ratio = 0.0007,
biomes = {"nether_caverns"},
y_max = nether.DEPTH_CEILING, -- keep compatibility with mapgen_nobiomes.lua
y_min = nether.DEPTH_FLOOR,
schematic = schematic_GlowstoneStalactite,
replacements = {["nether:glowstone"] = "nether:rack"},
flags = "place_center_x,place_center_z,all_ceilings",
place_offset_y=-3
})

+ 16
- 12
mapgen_nobiomes.lua View File

@@ -19,11 +19,11 @@

]]--

nether.DEPTH_FLOOR = -30912 -- this mapgen will create Nether all the way down

-- Parameters

local NETHER_DEPTH = nether.DEPTH
local NETHER_CEILING = nether.DEPTH_CEILING
local NETHER_FLOOR = nether.DEPTH_FLOOR
local TCAVE = 0.6
local BLEND = 128

@@ -44,13 +44,15 @@ local np_cave = {

-- Stuff

local yblmax = NETHER_DEPTH - BLEND * 2
local yblmin = NETHER_FLOOR + BLEND * 2
local yblmax = NETHER_CEILING - BLEND * 2



-- Mapgen

dofile(nether.path .. "/mapgen_decorations.lua")

-- Initialize noise object, localise noise and data buffers

local nobj_cave = nil
@@ -92,15 +94,15 @@ local c_netherrack = minetest.get_content_id("nether:rack")
-- On-generated function

minetest.register_on_generated(function(minp, maxp, seed)
if minp.y > NETHER_DEPTH then
if minp.y > NETHER_CEILING or maxp.y < NETHER_FLOOR then
return
end

local x1 = maxp.x
local y1 = maxp.y
local y1 = math.min(maxp.y, NETHER_CEILING)
local z1 = maxp.z
local x0 = minp.x
local y0 = minp.y
local y0 = math.max(minp.y, NETHER_FLOOR)
local z0 = minp.z

local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
@@ -126,11 +128,9 @@ minetest.register_on_generated(function(minp, maxp, seed)
local tcave
local in_chunk_y = false
if y >= y0 and y <= y1 then
if y > yblmax then
tcave = TCAVE + ((y - yblmax) / BLEND) ^ 2
else
tcave = TCAVE
end
tcave = TCAVE
if y > yblmax then tcave = TCAVE + ((y - yblmax) / BLEND) ^ 2 end
if y < yblmin then tcave = TCAVE + ((yblmin - y) / BLEND) ^ 2 end
in_chunk_y = true
end

@@ -189,6 +189,10 @@ minetest.register_on_generated(function(minp, maxp, seed)
end

vm:set_data(data)

-- 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()


+ 7
- 1
settingtypes.txt View File

@@ -16,4 +16,10 @@ nether_realm_enabled (Enable Nether realm & portal) bool true
nether_enable_portal_example_floatlands (Enable example portal: Floatlands) bool false

# Enables the Surface-travel portal api code example
nether_enable_portal_example_surfacetravel (Enable example portal: Surface-travel) bool false
nether_enable_portal_example_surfacetravel (Enable example portal: Surface-travel) bool false

[Nether depth]
#The depth where the Nether begins / the Nether ceiling
nether_depth_ymax (Upper limit of Nether) int -5000 -30000 32767
#The lower limit of the Nether must be at least 1000 lower than the upper limit, and more than 3000 lower is recommended.
nether_depth_ymin (Lower limit of Nether) int -11000 -32768 30000

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