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Noise optimisation. Fix code style issues. Add info to readme

master
paramat 6 years ago
parent
commit
0a1961a393
  1. 10
      README.txt
  2. 62
      init.lua

10
README.txt

@ -1,4 +1,10 @@
meru 0.3.0 by paramat
For latest stable Minetest and compatible back to 0.4.8
meru 0.3.1 by paramat
For Minetest 0.4.12 and later
Depends default
License WTFPL
Meru mod is a vertical 1 dimensional realm, 1D referring to large scale structure, and can act as a vertical connector between horizontal realms, such as the ground and the floatlands.
A single spike shaped mountain is created in newly generated chunks, at a random location within a chosen area, by default this area is +/-1024 for use in a new world, to add a mountain to an existing world you need to edit these area parameters to a completely ungenerated part of your world.
For testing this mod or for cheating edit parameter COORD = true, the co-ordinates of the mountain will be printed to terminal while within the generation area.
The mountain is a hollow cone made of stone and desert stone, with a smooth transition across biome boundaries. By default the height is 2km. There are a few cave entrances on the surface, these 'fissure system' caves expand under the surface helping the creation of a path upwards. If the mountain generates over water you can use the central conical void to jump down the last few hundred metres.
There are many parameters for fine tuning the structure, some parameters change smoothly with height or distance from the center. Reducing noise to zero at the center creates a perfect spike as a summit. Constant noise throughout often creates floating islands at the summit. Choosing zero noise throughout creates a smooth geometric conical shape. There is a parameter CONVEX to control whether the basic conical structure bulges outwards or is pinched inwards in the middle.

62
init.lua

@ -1,10 +1,3 @@
-- meru 0.3.0 by paramat
-- For latest stable Minetest and compatible back to 0.4.8
-- Depends default
-- License WTFPL
-- Voxelmanip version
-- Parameters
local COORD = false -- Print tower co-ordinates to terminal (cheat)
@ -18,9 +11,11 @@ local BASRAD = 64 -- Average radius at y = -32
local HEIGHT = 2048 -- Approximate height measured from y = -32
local CONVEX = 0.6 -- Convexity. <1 = concave, 1 = conical, >1 = convex
local VOID = 0.4 -- Void threshold. Controls size of central void
local NOISYRAD = 0.2 -- Noisyness of structure at base radius. 0 = smooth geometric form, 0.3 = noisy
local NOISYRAD = 0.2 -- Noisyness of structure at base radius.
-- 0 = smooth geometric form, 0.3 = noisy.
local NOISYCEN = 0 -- Noisyness of structure at centre
local FISOFFBAS = 0.02 -- Fissure noise offset at base. controls size of fissure entrances on outer surface
local FISOFFBAS = 0.02 -- Fissure noise offset at base,
-- controls size of fissure entrances on outer surface.
local FISOFFTOP = 0.04 -- Fissure noise offset at top
local FISEXPBAS = 0.6 -- Fissure expansion rate under surface at base
local FISEXPTOP = 1.2 -- Fissure expansion rate under surface at top
@ -30,7 +25,7 @@ local FISEXPTOP = 1.2 -- Fissure expansion rate under surface at top
local np_structure = {
offset = 0,
scale = 1,
spread = {x=64, y=64, z=64},
spread = {x = 64, y = 64, z = 64},
seed = 46893,
octaves = 5,
persist = 0.5
@ -41,25 +36,25 @@ local np_structure = {
local np_fissure = {
offset = 0,
scale = 1,
spread = {x=24, y=24, z=24},
spread = {x = 24, y = 24, z = 24},
seed = 92940980987,
octaves = 4,
persist = 0.5
}
-- End of parameters
-- 2D noise for biome. Parameters must match mgv6 biome noise
local np_biome = {
offset = 0,
scale = 1,
spread = {x=250, y=250, z=250},
spread = {x = 250, y = 250, z = 250},
seed = 9130,
octaves = 3,
persist = 0.5
}
-- Stuff
local cxmin = math.floor((XMIN + 32) / 80) -- limits in chunk co-ordinates
local czmin = math.floor((ZMIN + 32) / 80)
local cxmax = math.floor((XMAX + 32) / 80)
@ -75,7 +70,7 @@ minetest.register_node("meru:stone", {
description = "Stone",
tiles = {"default_stone.png"},
is_ground_content = false,
groups = {cracky=3, stone=1},
groups = {cracky = 3, stone = 1},
drop = "default:cobble",
sounds = default.node_sound_stone_defaults(),
})
@ -84,11 +79,17 @@ minetest.register_node("meru:destone", {
description = "Desert Stone",
tiles = {"default_desert_stone.png"},
is_ground_content = false,
groups = {cracky=3, stone=1},
groups = {cracky = 3, stone = 1},
drop = "default:desert_stone",
sounds = default.node_sound_stone_defaults(),
})
-- Initialize noise objects to nil
local nobj_structure = nil
local nobj_fissure = nil
local nobj_biome = nil
-- On generated function
minetest.register_on_generated(function(minp, maxp, seed)
@ -98,14 +99,14 @@ minetest.register_on_generated(function(minp, maxp, seed)
end
local locnoise = minetest.get_perlin(5839090, 2, 0.5, 3)
local noisex = locnoise:get2d({x=31,y=23})
local noisez = locnoise:get2d({x=17,y=11})
local noisex = locnoise:get2d({x = 31, y = 23})
local noisez = locnoise:get2d({x = 17, y = 11})
local cx = cxav + math.floor(noisex * xnom) -- chunk co ordinates
local cz = czav + math.floor(noisez * znom)
local merux = 80 * cx + 8
local meruz = 80 * cz + 8
if COORD then
print ("[meru] at x "..merux.." z "..meruz)
print ("[meru] at x " .. merux .. " z " .. meruz)
end
if minp.x < merux - 120 or minp.x > merux + 40
or minp.z < meruz - 120 or minp.z > meruz + 40
@ -120,22 +121,26 @@ minetest.register_on_generated(function(minp, maxp, seed)
local x1 = maxp.x
local y1 = maxp.y
local z1 = maxp.z
print ("[meru] chunk minp ("..x0.." "..y0.." "..z0..")")
local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
local area = VoxelArea:new{MinEdge = emin, MaxEdge = emax}
local data = vm:get_data()
local c_stone = minetest.get_content_id("meru:stone")
local c_destone = minetest.get_content_id("meru:destone")
local sidelen = x1 - x0 + 1
local chulens = {x=sidelen, y=sidelen, z=sidelen}
local minposxyz = {x=x0, y=y0, z=z0}
local chulens3d = {x = sidelen, y = sidelen, z = sidelen}
local chulens2d = {x = sidelen, y = sidelen, z = 1}
local minpos3d = {x = x0, y = y0, z = z0}
local nvals_structure = minetest.get_perlin_map(np_structure, chulens):get3dMap_flat(minposxyz)
local nvals_fissure = minetest.get_perlin_map(np_fissure, chulens):get3dMap_flat(minposxyz)
local nvals_biome = minetest.get_perlin_map(np_biome, chulens):get2dMap_flat({x=x0+150, y=z0+50})
nobj_structure = nobj_structure or minetest.get_perlin_map(np_structure, chulens3d)
nobj_fissure = nobj_fissure or minetest.get_perlin_map(np_fissure, chulens3d)
nobj_biome = nobj_biome or minetest.get_perlin_map(np_biome, chulens2d)
local nvals_structure = nobj_structure:get3dMap_flat(minpos3d)
local nvals_fissure = nobj_fissure:get3dMap_flat(minpos3d)
local nvals_biome = nobj_biome:get2dMap_flat({x = x0 + 150, y = z0 + 50})
local nixyz = 1 -- 3D noise index
local nixz = 1 -- 2D noise index
@ -176,11 +181,10 @@ minetest.register_on_generated(function(minp, maxp, seed)
end
vm:set_data(data)
vm:set_lighting({day=0, night=0})
vm:set_lighting({day = 0, night = 0})
vm:calc_lighting()
vm:write_to_map(data)
local chugent = math.ceil((os.clock() - t0) * 1000)
print ("[meru] "..chugent.." ms")
print ("[meru] " .. chugent .. " ms")
end)
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