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watershed/init.lua

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-- watershed 0.4.0 by paramat
-- For latest stable Minetest and back to 0.4.8
-- Depends default bucket
-- License: code WTFPL, textures CC BY-SA
-- Red cobble texture CC BY-SA by brunob.santos
-- no luxore abm
-- terblen exponent returns
-- enable xlscale
-- grass, flowers return to forest, grassland
-- Parameters
local YMIN = -33000 -- Approximate base of realm stone
local YMAX = 33000 -- Approximate top of atmosphere / mountains / floatlands
local TERCEN = -128 -- Terrain zero level, average seabed
local YWAT = 1 -- Sea surface y
local YSAV = 5 -- Average sandline y, dune grasses above this
local SAMP = 3 -- Sandline amplitude
local YCLOMIN = 207 -- Minimum height of mod clouds
local CLOUDS = true -- Mod clouds?
local TERSCA = 512 -- Vertical terrain scale
local XLSAMP = 0.1 -- Extra large scale height variation amplitude
local BASAMP = 0.3 -- Base terrain amplitude
local MIDAMP = 0.1 -- Mid terrain amplitude
local CANAMP = 0.4 -- Canyon terrain maximum amplitude
local ATANAMP = 1.1 -- Arctan function amplitude, smaller = more and larger floatlands above ridges
local BLENEXP = 2 -- Terrain blend exponent
local TSTONE = 0.02 -- Density threshold for stone, depth of soil at TERCEN
local TRIVER = -0.028 -- Densitybase threshold for river surface
local TRSAND = -0.035 -- Densitybase threshold for river sand
local TSTREAM = -0.004 -- Densitymid threshold for stream surface
local TSSAND = -0.005 -- Densitymid threshold for stream sand
local TLAVA = 2.3 -- Maximum densitybase threshold for lava, small because grad is non-linear
local TFIS = 0.01 -- Fissure threshold, controls width
local TSEAM = 0.1 -- Seam threshold, width of seams
local ORESCA = 512 -- Seam system vertical scale
local ORETHI = 0.002 -- Ore seam thickness tuner
local BERGDEP = 32 -- Maximum iceberg depth
local TFOG = -0.04 -- Fog top densitymid threshold
local HITET = 0.35 -- High temperature threshold
local LOTET = -0.35 -- Low ..
local ICETET = -0.7 -- Ice ..
local HIHUT = 0.35 -- High humidity threshold
local LOHUT = -0.35 -- Low ..
local FOGHUT = 1.0 -- Fog ..
local BLEND = 0.02 -- Biome blend randomness
local PINCHA = 36 -- Pine tree 1/x chance per node
local APTCHA = 36 -- Appletree
local FLOCHA = 289 -- Flower
local GRACHA = 36 -- Grassland grasses
local JUTCHA = 16 -- Jungletree
local JUGCHA = 16 -- Junglegrass
local CACCHA = 841 -- Cactus
local DRYCHA = 121 -- Dry shrub
local ACACHA = 841 -- Acacia tree
local GOGCHA = 16 -- Golden grass
local PAPCHA = 4 -- Papyrus
local DUGCHA = 16 -- Dune grass
-- 3D noise for terrain
local np_terrain = {
offset = 0,
scale = 1,
spread = {x=384, y=192, z=384},
seed = 593,
octaves = 5,
persist = 0.67
}
-- 3D noise for fissures
local np_fissure = {
offset = 0,
scale = 1,
spread = {x=256, y=512, z=256},
seed = 20099,
octaves = 5,
persist = 0.5
}
-- 3D noise for temperature
local np_temp = {
offset = 0,
scale = 1,
spread = {x=512, y=512, z=512},
seed = 9130,
octaves = 3,
persist = 0.5
}
-- 3D noise for humidity
local np_humid = {
offset = 0,
scale = 1,
spread = {x=512, y=512, z=512},
seed = -55500,
octaves = 3,
persist = 0.5
}
-- 3D noise for ore seam networks
local np_seam = {
offset = 0,
scale = 1,
spread = {x=512, y=512, z=512},
seed = -992221,
octaves = 2,
persist = 0.5
}
-- 3D noise for rock strata inclination
local np_strata = {
offset = 0,
scale = 1,
spread = {x=512, y=512, z=512},
seed = 92219,
octaves = 3,
persist = 0.5
}
-- 2D noise for mid terrain / streambed height
local np_mid = {
offset = 0,
scale = 1,
spread = {x=768, y=768, z=768},
seed = 85546,
octaves = 5,
persist = 0.5
}
-- 2D noise for base terrain / riverbed height
local np_base = {
offset = 0,
scale = 1,
spread = {x=4096, y=4096, z=4096},
seed = 8890,
octaves = 3,
persist = 0.33
}
-- 2D noise for extra large scale height variation
local np_xlscale = {
offset = 0,
scale = 1,
spread = {x=8192, y=8192, z=8192},
seed = -72,
octaves = 3,
persist = 0.33
}
-- 2D noise for magma surface
local np_magma = {
offset = 0,
scale = 1,
spread = {x=128, y=128, z=128},
seed = -13,
octaves = 2,
persist = 0.5
}
-- Stuff
watershed = {}
dofile(minetest.get_modpath("watershed").."/nodes.lua")
dofile(minetest.get_modpath("watershed").."/functions.lua")
-- On generated function
minetest.register_on_generated(function(minp, maxp, seed)
if minp.y < YMIN or maxp.y > YMAX then
return
end
local t1 = os.clock()
local x1 = maxp.x
local y1 = maxp.y
local z1 = maxp.z
local x0 = minp.x
local y0 = minp.y
local z0 = minp.z
print ("[watershed] chunk minp ("..x0.." "..y0.." "..z0..")")
-- voxelmanip stuff
local vm, emin, emax = minetest.get_mapgen_object("voxelmanip") -- min, max points for emerged area/voxelarea
local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax} -- voxelarea helper for indexes
local data = vm:get_data() -- get flat array of voxelarea content ids
-- content ids
local c_air = minetest.get_content_id("air")
local c_water = minetest.get_content_id("default:water_source")
local c_sand = minetest.get_content_id("default:sand")
local c_desand = minetest.get_content_id("default:desert_sand")
local c_snowblock = minetest.get_content_id("default:snowblock")
local c_ice = minetest.get_content_id("default:ice")
local c_dirtsnow = minetest.get_content_id("default:dirt_with_snow")
local c_jungrass = minetest.get_content_id("default:junglegrass")
local c_dryshrub = minetest.get_content_id("default:dry_shrub")
local c_danwhi = minetest.get_content_id("flowers:dandelion_white")
local c_danyel = minetest.get_content_id("flowers:dandelion_yellow")
local c_rose = minetest.get_content_id("flowers:rose")
local c_tulip = minetest.get_content_id("flowers:tulip")
local c_geranium = minetest.get_content_id("flowers:geranium")
local c_viola = minetest.get_content_id("flowers:viola")
local c_stodiam = minetest.get_content_id("default:stone_with_diamond")
local c_mese = minetest.get_content_id("default:mese")
local c_stogold = minetest.get_content_id("default:stone_with_gold")
local c_stocopp = minetest.get_content_id("default:stone_with_copper")
local c_stoiron = minetest.get_content_id("default:stone_with_iron")
local c_stocoal = minetest.get_content_id("default:stone_with_coal")
local c_sandstone = minetest.get_content_id("default:sandstone")
local c_gravel = minetest.get_content_id("default:gravel")
local c_clay = minetest.get_content_id("default:clay")
local c_grass5 = minetest.get_content_id("default:grass_5")
local c_obsidian = minetest.get_content_id("default:obsidian")
local c_wsfreshwater = minetest.get_content_id("watershed:freshwater")
local c_wsmixwater = minetest.get_content_id("watershed:mixwater")
local c_wsstone = minetest.get_content_id("watershed:stone")
local c_wsredstone = minetest.get_content_id("watershed:redstone")
local c_wsgrass = minetest.get_content_id("watershed:grass")
local c_wsdrygrass = minetest.get_content_id("watershed:drygrass")
local c_wsgoldengrass = minetest.get_content_id("watershed:goldengrass")
local c_wsdirt = minetest.get_content_id("watershed:dirt")
local c_wspermafrost = minetest.get_content_id("watershed:permafrost")
local c_wslava = minetest.get_content_id("watershed:lava")
local c_wsfreshice = minetest.get_content_id("watershed:freshice")
local c_wscloud = minetest.get_content_id("watershed:cloud")
local c_wsluxore = minetest.get_content_id("watershed:luxore")
local c_wsicydirt = minetest.get_content_id("watershed:icydirt")
-- perlinmap stuff
local sidelen = x1 - x0 + 1 -- chunk sidelength
local chulens = {x=sidelen, y=sidelen+2, z=sidelen} -- chunk dimensions, '+2' for overgeneration
local minposxyz = {x=x0, y=y0-1, z=z0} -- 3D and 2D perlinmaps start from these co-ordinates, '-1' for overgeneration
local minposxz = {x=x0, y=z0}
-- 3D and 2D perlinmaps
local nvals_terrain = minetest.get_perlin_map(np_terrain, chulens):get3dMap_flat(minposxyz)
local nvals_fissure = minetest.get_perlin_map(np_fissure, chulens):get3dMap_flat(minposxyz)
local nvals_temp = minetest.get_perlin_map(np_temp, chulens):get3dMap_flat(minposxyz)
local nvals_humid = minetest.get_perlin_map(np_humid, chulens):get3dMap_flat(minposxyz)
local nvals_seam = minetest.get_perlin_map(np_seam, chulens):get3dMap_flat(minposxyz)
local nvals_strata = minetest.get_perlin_map(np_strata, chulens):get3dMap_flat(minposxyz)
local nvals_mid = minetest.get_perlin_map(np_mid, chulens):get2dMap_flat(minposxz)
local nvals_base = minetest.get_perlin_map(np_base, chulens):get2dMap_flat(minposxz)
local nvals_xlscale = minetest.get_perlin_map(np_xlscale, chulens):get2dMap_flat(minposxz)
local nvals_magma = minetest.get_perlin_map(np_magma, chulens):get2dMap_flat(minposxz)
local ungen = false -- ungenerated chunk below?
if minetest.get_node({x=x0, y=y0-1, z=z0}).name == "ignore" then
ungen = true
end
-- mapgen loop
local nixyz = 1 -- 3D and 2D perlinmap indexes
local nixz = 1
local stable = {} -- stability table of true/false. is node supported from below by 2 stone or nodes on 2 stone?
local under = {} -- biome table. biome number of previous fine material placed in column
for z = z0, z1 do -- for each xy plane progressing northwards
for y = y0 - 1, y1 + 1 do -- for each x row progressing upwards
local vi = area:index(x0, y, z) -- voxelmanip index for first node in this x row
local viu = area:index(x0, y-1, z) -- index for under node
for x = x0, x1 do -- for each node do
local si = x - x0 + 1 -- stable, under tables index
-- noise values for node
local n_absterrain = math.abs(nvals_terrain[nixyz])
local n_fissure = nvals_fissure[nixyz]
local n_temp = nvals_temp[nixyz]
local n_humid = nvals_humid[nixyz]
local n_seam = nvals_seam[nixyz]
local n_strata = nvals_strata[nixyz]
local n_absmid = math.abs(nvals_mid[nixz])
local n_absbase = math.abs(nvals_base[nixz])
local n_xlscale = nvals_xlscale[nixz]
local n_magma = nvals_magma[nixz]
-- get densities
local n_invbase = (1 - n_absbase)
local terblen = (math.max(n_invbase, 0)) ^ BLENEXP
local grad = math.atan((TERCEN - y) / TERSCA) * ATANAMP
local densitybase = n_invbase * BASAMP + n_xlscale * XLSAMP + grad
local densitymid = n_absmid * MIDAMP + densitybase
local canexp = 0.5 + terblen * 0.5
local canamp = terblen * CANAMP
local density = n_absterrain ^ canexp * canamp * n_absmid + densitymid
-- other values
local triver = TRIVER * n_absbase -- river threshold
local trsand = TRSAND * n_absbase -- river sand
local tstream = TSTREAM * (1 - n_absmid) -- stream threshold
local tssand = TSSAND * (1 - n_absmid) -- stream sand
local tstone = TSTONE * (1 + grad) -- stone threshold
local tlava = TLAVA * (1 - n_magma ^ 4 * terblen ^ 16 * 0.5) -- lava threshold
local ysand = YSAV + n_fissure * SAMP + math.random() * 2 -- sandline
local bergdep = math.abs(n_seam) * BERGDEP -- iceberg depth
local nofis = false -- set fissure bool
if math.abs(n_fissure) >= TFIS then
nofis = true
end
local biome = false -- select biome for node
if n_temp < LOTET + (math.random() - 0.5) * BLEND then
if n_humid < LOHUT + (math.random() - 0.5) * BLEND then
biome = 1 -- tundra
elseif n_humid > HIHUT + (math.random() - 0.5) * BLEND then
biome = 3 -- taiga
else
biome = 2 -- snowy plains
end
elseif n_temp > HITET + (math.random() - 0.5) * BLEND then
if n_humid < LOHUT + (math.random() - 0.5) * BLEND then
biome = 7 -- desert
elseif n_humid > HIHUT + (math.random() - 0.5) * BLEND then
biome = 9 -- rainforest
else
biome = 8 -- savanna
end
else
if n_humid < LOHUT then
biome = 4 -- dry grassland
elseif n_humid > HIHUT then
biome = 6 -- deciduous forest
else
biome = 5 -- grassland
end
end
-- overgeneration and in-chunk generation
if y == y0 - 1 then -- node layer below chunk, initialise tables
under[si] = 0
if ungen then
if nofis and density >= 0 then -- if node solid
stable[si] = 2
else
stable[si] = 0
end
else -- scan top layer of chunk below
local nodename = minetest.get_node({x=x,y=y,z=z}).name
if nodename == "watershed:stone"
or nodename == "watershed:redstone"
or nodename == "watershed:dirt"
or nodename == "watershed:permafrost"
or nodename == "watershed:luxoreoff"
or nodename == "default:sand"
or nodename == "default:desert_sand"
or nodename == "default:mese"
or nodename == "default:stone_with_diamond"
or nodename == "default:stone_with_gold"
or nodename == "default:stone_with_copper"
or nodename == "default:stone_with_iron"
or nodename == "default:stone_with_coal"
or nodename == "default:sandstone"
or nodename == "default:gravel"
or nodename == "default:clay"
or nodename == "default:obsidian" then
stable[si] = 2
else
stable[si] = 0
end
end
elseif y >= y0 and y <= y1 then -- chunk
-- add nodes and flora
if densitybase >= tlava then -- lava
if densitybase >= 0 then
data[vi] = c_wslava
end
stable[si] = 0
under[si] = 0
elseif densitybase >= tlava - math.min(0.6 + density * 6, 0.6) and density < tstone then -- obsidian
data[vi] = c_obsidian
stable[si] = 1
under[si] = 0
elseif density >= tstone and nofis -- stone cut by fissures
or (density >= tstone and density < TSTONE * 1.2 and y <= YWAT) -- stone around water
or (density >= tstone and density < TSTONE * 1.2 and densitybase >= triver ) -- stone around river
or (density >= tstone and density < TSTONE * 1.2 and densitymid >= tstream ) then -- stone around stream
local densitystr = n_strata * 0.25 + (TERCEN - y) / ORESCA
local densityper = densitystr - math.floor(densitystr) -- periodic strata 'density'
if (densityper >= 0.05 and densityper <= 0.09) -- sandstone strata
or (densityper >= 0.25 and densityper <= 0.28)
or (densityper >= 0.45 and densityper <= 0.47)
or (densityper >= 0.74 and densityper <= 0.76)
or (densityper >= 0.77 and densityper <= 0.79)
or (densityper >= 0.84 and densityper <= 0.87)
or (densityper >= 0.95 and densityper <= 0.98) then
data[vi] = c_sandstone
elseif biome == 7 and density < TSTONE * 3 then -- desert stone as surface layer
data[vi] = c_wsredstone
elseif math.abs(n_seam) < TSEAM then
if densityper >= 0 and densityper <= ORETHI * 4 then -- ore seams
data[vi] = c_stocoal
elseif densityper >= 0.3 and densityper <= 0.3 + ORETHI * 4 then
data[vi] = c_stocoal
elseif densityper >= 0.5 and densityper <= 0.5 + ORETHI * 4 then
data[vi] = c_stocoal
elseif densityper >= 0.8 and densityper <= 0.8 + ORETHI * 4 then
data[vi] = c_stocoal
elseif densityper >= 0.55 and densityper <= 0.55 + ORETHI * 2 then
data[vi] = c_gravel
elseif densityper >= 0.1 and densityper <= 0.1 + ORETHI * 2 then
data[vi] = c_wsluxore
elseif densityper >= 0.2 and densityper <= 0.2 + ORETHI * 2
and math.random(2) == 2 then
data[vi] = c_stoiron
elseif densityper >= 0.65 and densityper <= 0.65 + ORETHI * 2
and math.random(2) == 2 then
data[vi] = c_stoiron
elseif densityper >= 0.4 and densityper <= 0.4 + ORETHI * 2
and math.random(3) == 2 then
data[vi] = c_stocopp
elseif densityper >= 0.6 and densityper <= 0.6 + ORETHI
and math.random(5) == 2 then
data[vi] = c_stogold
elseif densityper >= 0.7 and densityper <= 0.7 + ORETHI
and math.random(7) == 2 then
data[vi] = c_mese
elseif densityper >= 0.9 and densityper <= 0.9 + ORETHI
and math.random(11) == 2 then
data[vi] = c_stodiam
else
data[vi] = c_wsstone
end
else
data[vi] = c_wsstone
end
stable[si] = stable[si] + 1
under[si] = 0
elseif density >= 0 and density < tstone and stable[si] >= 2 then -- fine materials
if y == YWAT - 2 and math.abs(n_temp) < 0.05 then -- clay
data[vi] = c_clay
elseif y <= ysand then -- seabed/beach/dune sand not cut by fissures
data[vi] = c_sand
under[si] = 10 -- beach/dunes
elseif densitybase >= trsand + math.random() * 0.001 then -- river sand
data[vi] = c_sand
under[si] = 11 -- riverbank papyrus
elseif densitymid >= tssand + math.random() * 0.001 then -- stream sand
data[vi] = c_sand
under[si] = 0
elseif nofis then -- fine materials cut by fissures
if biome == 1 then
data[vi] = c_wspermafrost
under[si] = 1 -- tundra
elseif biome == 2 then
data[vi] = c_wsdirt
under[si] = 2 -- snowy plains
elseif biome == 3 then
data[vi] = c_wsdirt
under[si] = 3 -- taiga
elseif biome == 4 then
data[vi] = c_wsdirt
under[si] = 4 -- dry grassland
elseif biome == 5 then
data[vi] = c_wsdirt
under[si] = 5 -- grassland
elseif biome == 6 then
data[vi] = c_wsdirt
under[si] = 6 -- forest
elseif biome == 7 then
data[vi] = c_desand
under[si] = 7 -- desert
elseif biome == 8 then
data[vi] = c_wsdirt
under[si] = 8 -- savanna
elseif biome == 9 then
data[vi] = c_wsdirt
under[si] = 9 -- rainforest
end
else -- fissure
stable[si] = 0
under[si] = 0
end
elseif y >= YWAT - bergdep and y <= YWAT + bergdep / 8 and n_temp < ICETET -- icesheet
and density < tstone and math.abs(n_fissure) > 0.01 then
data[vi] = c_ice
under[si] = 12
stable[si] = 0
elseif y <= YWAT and density < tstone then -- sea water
data[vi] = c_water
under[si] = 0
stable[si] = 0
elseif densitybase >= triver and density < tstone then -- river water not in fissures
if n_temp < ICETET then
data[vi] = c_wsfreshice
else
if y == YWAT + 1 then
data[vi] = c_wsmixwater
else
data[vi] = c_wsfreshwater
end
end
stable[si] = 0
under[si] = 0
elseif densitymid >= tstream and density < tstone then -- stream water not in fissures
if n_temp < ICETET then
data[vi] = c_wsfreshice
else
if y == YWAT + 1 then
data[vi] = c_wsmixwater
else
data[vi] = c_wsfreshwater
end
end
stable[si] = 0
under[si] = 0
elseif density < 0 and y >= YWAT and under[si] ~= 0 then -- air above surface node
local fnoise = n_fissure -- noise for flower colours
if under[si] == 1 then
data[viu] = c_wsicydirt
if math.random(DRYCHA) == 2 then
data[vi] = c_dryshrub
end
elseif under[si] == 2 then
data[viu] = c_dirtsnow
data[vi] = c_snowblock
elseif under[si] == 3 then
if math.random(PINCHA) == 2 then
watershed_pinetree(x, y, z, area, data)
else
data[viu] = c_dirtsnow
data[vi] = c_snowblock
end
elseif under[si] == 4 then
data[viu] = c_wsdrygrass
if math.random(DRYCHA) == 2 then
data[vi] = c_dryshrub
end
elseif under[si] == 5 then
data[viu] = c_wsgrass
if math.random(FLOCHA) == 2 then
watershed_flower(data, vi, fnoise)
elseif math.random(GRACHA) == 2 then
data[vi] = c_grass5
end
elseif under[si] == 6 then
if math.random(APTCHA) == 2 then
watershed_appletree(x, y, z, area, data)
else
data[viu] = c_wsgrass
if math.random(FLOCHA) == 2 then
watershed_flower(data, vi, fnoise)
elseif math.random(GRACHA) == 2 then
data[vi] = c_grass5
end
end
elseif under[si] == 7 and n_temp < HITET + 0.1 then
if math.random(CACCHA) == 2 then
watershed_cactus(x, y, z, area, data)
elseif math.random(DRYCHA) == 2 then
data[vi] = c_dryshrub
end
elseif under[si] == 8 then
if math.random(ACACHA) == 2 then
watershed_acaciatree(x, y, z, area, data)
else
data[viu] = c_wsdrygrass
if math.random(GOGCHA) == 2 then
data[vi] = c_wsgoldengrass
end
end
elseif under[si] == 9 then
if math.random(JUTCHA) == 2 then
watershed_jungletree(x, y, z, area, data)
else
data[viu] = c_wsgrass
if math.random(JUGCHA) == 2 then
data[vi] = c_jungrass
end
end
elseif under[si] == 10 then -- dunes
if math.random(DUGCHA) == 2 and y > YSAV
and biome >= 4 then
data[vi] = c_wsgoldengrass
end
elseif under[si] == 11 and n_temp > HITET then -- hot biome riverbank
if math.random(PAPCHA) == 2 then
watershed_papyrus(x, y, z, area, data)
end
elseif under[si] == 12
and n_humid > LOHUT + (math.random() - 0.5) * BLEND then -- snowy iceberg
data[vi] = c_snowblock
end
stable[si] = 0
under[si] = 0
elseif density < 0 and densitymid > TFOG and n_humid > FOGHUT then -- fog
data[vi] = c_wscloud
stable[si] = 0
under[si] = 0
elseif density < 0 and CLOUDS and y == y1 and y >= YCLOMIN then -- clouds
local xrq = 16 * math.floor((x - x0) / 16) -- quantise to 16x16 lattice
local zrq = 16 * math.floor((z - z0) / 16)
local yrq = 79
local qixyz = zrq * 6400 + yrq * 80 + xrq + 1 -- quantised 3D index
if math.abs(nvals_fissure[qixyz]) < nvals_humid[qixyz] * 0.1 then
data[vi] = c_wscloud
end
stable[si] = 0
under[si] = 0
else -- air
stable[si] = 0
under[si] = 0
end
elseif y == y1 + 1 then -- plane of nodes above chunk
if density < 0 and y >= YWAT and under[si] ~= 0 then -- if air above fine materials
if under[si] == 1 then -- add surface nodes to chunk top layer
data[viu] = c_wsicydirt
elseif under[si] == 2 then
data[viu] = c_dirtsnow
data[vi] = c_snowblock -- snowblocks in chunk above
elseif under[si] == 3 then
data[viu] = c_dirtsnow
data[vi] = c_snowblock
elseif under[si] == 4 then
data[viu] = c_wsdrygrass
elseif under[si] == 5 then
data[viu] = c_wsgrass
elseif under[si] == 6 then
data[viu] = c_wsgrass
elseif under[si] == 8 then
data[viu] = c_wsdrygrass
elseif under[si] == 9 then
data[viu] = c_wsgrass
end
end
end
nixyz = nixyz + 1 -- increment perlinmap and voxelarea indexes along x row
nixz = nixz + 1
vi = vi + 1
viu = viu + 1
end
nixz = nixz - 80
end
nixz = nixz + 80
end
-- voxelmanip stuff
vm:set_data(data)
vm:set_lighting({day=0, night=0})
vm:calc_lighting()
vm:write_to_map(data)
local chugent = math.ceil((os.clock() - t1) * 1000) -- chunk generation time
print ("[watershed] "..chugent.." ms")
end)
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