Add biome generation in engine

Currently, performance seems an issue - the cause of the effects is to be determined.
pull/1/head
Bram van den Heuvel 2024-04-22 09:00:53 +02:00
parent b9e18f70eb
commit acfdea349f
4 changed files with 107 additions and 17 deletions

6
API.md
View File

@ -126,6 +126,12 @@ The biomes are defined as follows:
node_roof = "foo:bluestone",
-- Node forming the ceiling of the cave
node_air = "foo:air",
-- Nodes filling the inside of the cave. By default, this is air.
-- You can replace it with e.g. water to make the entire cave a water cave.
-- Keep in mind that cave biomes can blend, so it might not always look
-- very smooth.
node_shell = "foo:permafrost",
depth_shell = 3,
-- Node forming a layer around the entire cave and thickness of this layer

View File

@ -11,6 +11,9 @@ noordstar_caves = {}
-- Load features to influence cave shapes
load("shape")
-- Load features to influence cave biomes
load("biome")
-- Start engine to generate caves
load("engine")

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@ -59,6 +59,9 @@ local function clean_def(def)
if type(def.node_roof) == "string" then
d.node_roof = def.node_roof
end
if type(def.node_air) == "string" then
d.node_air = def.node_air
end
if type(def.node_shell) == "string" then
d.node_shell = def.node_shell
end

View File

@ -2,6 +2,38 @@
-- Constants and magic numbers
local mapgen_buffer = 16
-- Noise params for heat_point
local heat_noise_params =
{ offset = 50
, scale = 50
, spread = { x = 200, y = 200, z = 200 }
, seed = 320523
, octaves = 2
, persistence = 0.1
, lacunarity = 2.0
, flags = ""
}
-- Noise params for humidity_point
local humidity_noise_params =
{ offset = 50
, scale = 50
, spread = { x = 200, y = 200, z = 200 }
, seed = 9923473
, octaves = 2
, persistence = 0.1
, lacunarity = 2.0
, flags = ""
}
local default_biome =
{ name = "noordstar_caves:none"
, heat_point = -1e6
, humidity_point = -1e6
, minp = { x = -1e5, y = -1e5, z = -1e5 }
, maxp = { x = 1e5, y = 1e5, z = 1e5 }
}
-- Convert 3d relative coordinates to an index on a flat array
local function from_3d_to_flat(dx, dy, dz, nx, ny)
return (nx * ny * dz) + (nx * dy) + dx + 1
@ -421,6 +453,46 @@ local function get_flat_cave_node_types(minp, maxp)
end)
end
-- Transform categorized blocks into
local function biome_def_to_content_id(def, nt, original_block)
local function get_node(name, alt)
return function()
if name == nil then
return alt
else
return minetest.get_content_id(name)
end
end
end
local node_air = get_node(def.node_air, minetest.get_content_id("air"))
local node_floor = get_node(def.node_floor, original_block)
local node_stone = original_block
local node_roof = get_node(def.node_roof, original_block)
local node_unknown = original_block
local node_wall = get_node(def.node_wall, original_block)
if nt == node_type.unknown then
return node_unknown
elseif nt == node_type.floor then
return node_floor()
elseif nt == node_type.wall then
return node_wall()
elseif nt == node_type.roof then
return node_roof()
elseif nt == node_type.content then
return node_air()
elseif nt == node_type.stone then
return node_stone
else
return original_block
end
end
local function biome_distance(def, heat, humidity)
return (def.heat_point - heat)^2 + (def.humidity_point - humidity)^2
end
minetest.register_on_generated(function(minp, maxp, blockseed)
local vminp =
{ x = minp.x - mapgen_buffer
@ -440,29 +512,35 @@ minetest.register_on_generated(function(minp, maxp, blockseed)
-- Get threshold values
local node_types = get_flat_cave_node_types(vminp, vmaxp)
local node_air = minetest.get_content_id("air")
local node_floor = minetest.get_content_id("mcl_core:glass_green")
local node_wall = minetest.get_content_id("mcl_core:glass_purple")
local node_roof = minetest.get_content_id("mcl_core:glass_red")
local node_other = minetest.get_content_id("mcl_core:glass")
local heat_points = get_flat_from_noise_params(minp, maxp, heat_noise_params)
local humidity_points = get_flat_from_noise_params(minp, maxp, humidity_noise_params)
-- Map block values
local nids = Flat3dArray:from_func(vminp, vmaxp, function(i, pos)
local nt = node_types:get_pos(pos)
if not is_valid_pos(pos, minp, maxp) then
return flat_data:get_pos(pos)
elseif nt == node_type.unknown then
return node_other
elseif nt == node_type.floor then
return node_floor
elseif nt == node_type.wall then
return node_wall
elseif nt == node_type.roof then
return node_roof
elseif nt == node_type.content then
return node_air
elseif nt == node_type.stone then
return flat_data:get_pos(pos)
else
local biome = default_biome
local heat = heat_points:get_pos(pos)
local humidity = humidity_points:get_pos(pos)
for _, def in pairs(noordstar_caves.registered_biomes) do
if pos.x < def.minp.x then
elseif pos.y < def.minp.y then
elseif pos.z < def.minp.z then
elseif pos.x > def.maxp.x then
elseif pos.y > def.maxp.y then
elseif pos.z > def.maxp.z then
elseif biome_distance(def, heat, humidity) > biome_distance(biome, heat, humidity) then
else
biome = def
end
end
return biome_def_to_content_id(biome, nt, flat_data:get_pos(pos))
end
end)