travelers_adventure/mods/eg_prospector/init.lua

local modname = minetest.get_current_modname()
local S = minetest.get_translator(modname)
local modpath = minetest.get_modpath(modname)

_G[modname] = {}

local ore_noise_params = {}
local range_ranges = {}

_G[modname].register_prospectable = function(name, oredef)
	ore_noise_params[name] = oredef.noise_params
	range_ranges[name] = {min = oredef.y_min or -31000, max = oredef.y_max or 31000}
end

local ore_noise_objects

minetest.register_on_joinplayer(function()
		if not ore_noise_objects
		then
			ore_noise_objects = {}
			for k, v in pairs(ore_noise_params)
			do
				ore_noise_objects[k] = minetest.get_perlin(v)
			end
		end
	end)

_G[modname].get_prospect = function(pos)
	local prospect = {}
	for k, v in pairs(ore_noise_objects)
	do
		local range = range_ranges[k]
		if pos.y > range.min and pos.y < range.max
		then
			prospect[k] = v:get_3d(pos)
			print(prospect[k])
		end
	end
	return prospect
end

dofile(modpath .. "/pick.lua")