294 lines
8.5 KiB
Lua
294 lines
8.5 KiB
Lua
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-- Convert 3d relative coordinates to an index on a flat array
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local function from_3d_to_flat(dx, dy, dz, nx, ny)
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return (nx * ny * dz) + (nx * dy) + dx + 1
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end
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-- Convert an index on a flat array to 3d relative coordinates
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local function from_flat_to_3d(i, nx, ny)
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return {
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dx = (i - 1) % nx,
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dy = math.floor((i - 1) / nx) % ny,
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dz = math.floor((i - 1) / (nx * ny))
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}
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end
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-- Iterate over a 3d area, both indexing by the index and the ansolute position
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local function iter_3d_area(minp, maxp, callback)
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local nx = maxp.x - minp.x + 1
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local ny = maxp.y - minp.y + 1
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local nz = maxp.z - minp.z + 1
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for i = 1, nx * ny * nz do
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local dpos = from_flat_to_3d(i, nx, ny)
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local pos = {
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x = minp.x + dpos.dx,
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y = minp.y + dpos.dy,
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z = minp.z + dpos.dz,
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}
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callback(i, pos)
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end
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end
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-- Get an enhanced function from the def function that warns us when the
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-- function does not behave properly
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local function enhanced_func(def)
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if type(def.name) ~= "string" then
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error("Invalid nameless shape definition")
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elseif type(def.func) ~= "function" then
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error(
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"Invalid shape definition misses an adjustment function"
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)
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else
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return function(pos, n)
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local out = def.func(pos, n)
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if type(out) == "number" then
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return out
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elseif n == nil then
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error(
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"Shape " .. def.name .. " function must return a number. The input `n` was nil. Perhaps your `noise_params` field is invalid?"
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)
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else
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error("Shape " .. def.name .. " function must return a number.")
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end
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end
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end
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end
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-- Get a flat array of cave shape noise values from a given cave shape def
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local function get_flat_from_shape_def(def, minp, maxp)
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local f = enhanced_func(def)
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local nx = maxp.x - minp.x + 1
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local ny = maxp.y - minp.y + 1
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local nz = maxp.z - minp.z + 1
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local noise_flat_map = {}
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-- If noise parameters have been defined, fill the table with noise
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-- If not, all values remain nil
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if def.noise_params ~= nil then
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local p = PerlinNoiseMap(def.noise_params, { x = nx, y = ny, z = nz })
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if nz == 1 then
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p:get_2d_map_flat(minp, noise_flat_map)
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else
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p:get_3d_map_flat(minp, noise_flat_map)
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end
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end
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iter_3d_area(minp, maxp, function(i, pos)
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noise_flat_map[i] = f(pos, noise_flat_map[i])
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end)
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return noise_flat_map
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end
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local function get_flat_from_noise_params(minp, maxp, noise_params)
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local nx = maxp.x - minp.x + 1
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local ny = maxp.y - minp.y + 1
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local nz = maxp.z - minp.z + 1
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local buffer = {}
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local p = PerlinNoiseMap(noise_params, { x = nx, y = ny, z = nz })
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if nz == 1 then
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p:get_2d_map_flat(minp, buffer)
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else
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p:get_3d_map_flat(minp, buffer)
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end
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return buffer
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end
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-- Based on the number of cave shapes, calculate how quickly connectivity is
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-- meant to change
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local function get_connectivity_noise_params(shape_size)
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local factor = math.max(math.abs(shape_size) ^ 0.5, 1)
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return {
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offset = 50,
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scale = 50,
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spread = { x = factor * 250, y = factor * 100, z = factor * 250 },
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seed = 297948,
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octaves = 2,
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persistence = 0.2,
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lacunarity = 2.0,
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flags = "eased"
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}
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end
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-- Based on the number of cave shapes, calculate how quickly verticality is
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-- meant to change
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local function get_verticality_noise_params(shape_size)
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local factor = math.max(math.abs(shape_size) ^ 0.5, 1)
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return {
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offset = 50,
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scale = 50,
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spread = { x = factor * 100, y = factor * 250, z = factor * 100 },
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seed = 35644,
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octaves = 2,
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persistence = 0.2,
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lacunarity = 2.0,
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flags = "eased"
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}
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end
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-- Get the distance of each cave shape to calculate their weight.
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local function shape_distance_weight(shape_size, dx, dy)
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local factor = math.max(math.abs(shape_size) ^ 0.5, 1)
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local max_distance = 100 / factor
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if dx^2 + dy^2 > max_distance^2 then
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return 0
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else
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return 1 / (dx^5 + dy^5)
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end
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end
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-- Get a flat map containing all flat threshold values
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local function get_threshold_flat(minp, maxp)
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local connectivity = get_flat_from_noise_params(
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minp, maxp,
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get_connectivity_noise_params(#noordstar_caves.registered_shapes)
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)
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local verticality = get_flat_from_noise_params(
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minp, maxp,
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get_verticality_noise_params(#noordstar_caves.registered_shapes)
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)
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local noise = {}
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-- Get noise for all cave shapes
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for key, def in pairs(noordstar_caves.registered_shapes) do
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noise[key] = {
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key = key,
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noise = get_flat_from_shape_def(def, minp, maxp),
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def = def
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}
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end
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local thresholds = {}
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-- Fill the table
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iter_3d_area(minp, maxp, function(i, pos)
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local total = 0
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local count = 0
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local x = connectivity[i]
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local y = verticality[i]
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for _, n in pairs(noise) do
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local v = n.noise[i]
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local dx = math.abs(x - n.def.connectivity_point)
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local dy = math.abs(y - n.def.verticality_point)
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local w = math.abs(shape_distance_weight(
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#noordstar_caves.registered_shapes, dx, dy
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))
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total = total + v * w
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count = count + w
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end
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if count <= 0 then
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thresholds[i] = -1000
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else
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thresholds[i] = total / count
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end
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end)
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return thresholds
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end
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-- Old minimum height for the overworld
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local old_overworld_min = mcl_vars.mg_overworld_min
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-- If another mod doesn't override the maximum world depth, we will assume that
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-- the world depth is the following value.
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local world_depth = -800
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-- Otherwise, this variable can be changed using the following function,
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-- which will also update all the other necessary variables
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function noordstar_caves.set_world_depth(h)
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-- Set world depth variable
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world_depth = h
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end
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noordstar_caves.set_world_depth(world_depth)
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-- The `cave_vastness` is a variable that determines the size of caves.
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-- The function takes in an x, y and z variable, and returns a number between
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-- 0 and 1.
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-- Low numbers mean very rare and tiny caves, while high numbers mean massive
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-- caves, with massive open spaces.
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-- If you wish to overwrite this function, it is good to keep in mind to:
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-- - Make sure that the output changes VERY SLOWLY over time
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-- - This function will be run a LOT so it is very performance sensitive
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noordstar_caves.cave_vastness = function(pos)
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return pos.y / world_depth
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end
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-- Secretly, we're using an internal function that also adds a safe layer for
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-- when we're approaching bedrock levels
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local function cave_vastness(pos)
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if world_depth + 20 < pos.y then
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return noordstar_caves.cave_vastness(pos)
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elseif world_depth + 5 < pos.y then
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return noordstar_caves.cave_vastness(pos) * math.abs(pos.y - world_depth - 5) / 15
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else
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return 0
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end
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end
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local tpd_yet = false
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minetest.register_on_generated(function(minp, maxp, blockseed)
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if maxp.y < world_depth then
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return
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end
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-- Get voxelmanip
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local vm = minetest.get_mapgen_object("voxelmanip")
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local data = vm:get_data()
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-- Get threshold values
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local thresholds = get_threshold_flat(minp, maxp)
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local air = minetest.get_content_id("mcl_core:glass")
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local count = 0
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iter_3d_area(minp, maxp, function(i, pos)
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local nx = maxp.x - minp.x + 1 + 32
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local ny = maxp.y - minp.y + 1 + 32
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local dx = pos.x - minp.x
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local dy = pos.y - minp.y
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local dz = pos.z - minp.z
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local vi = from_3d_to_flat(dx + 16, dy + 16, dz + 16, nx, ny)
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if not data[vi] then
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error("Vi is not in data (len " .. #data .. "): " .. vi .. " for (dx, dy, dz) = (" .. dx .. ", " .. dy .. ", " .. dz .. ") with minp = (" .. minp.x .. ", " .. minp.y .. ", " .. minp.z .. ") and maxp = (" .. maxp.x .. ", " .. maxp.y .. ", " .. maxp.z .. ") and pos = (" .. pos.x .. ", " .. pos.y .. ", " .. pos.z .. ")")
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end
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if thresholds[i] >= (1 - cave_vastness(pos)) then
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data[vi] = air
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count = count + 1
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end
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end)
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-- Write all changes to the Minetest world
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vm:set_data(data)
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vm:write_to_map()
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minetest.chat_send_all("Updated " .. count .. " squares")
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end)
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