94 lines
2.6 KiB
Lua
94 lines
2.6 KiB
Lua
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--[[
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Geothermometer device v1.0
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Principle of calculations:
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heat energy dissipates with square distance from source (twice the distance
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four times less heat)
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Calculations explained:
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* initial block temperature variation = 0.0
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* find all water blocks in range, count them and find distance from block,
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then change temperature adding -sum(1/d^2)
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* find all lava blocks in range, count them and find distance from block,
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then change temperature adding +sum(1/d^2)
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* resulting value shows how nearby water or lava affects block temperature
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* scale it by chosen factor to amplify differences
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]]--
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-- ************************
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-- Namespaces and variables
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-- ************************
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local geothermometer = {}
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local tool_range = 8
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local scan_range = 10
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local temp_scale = 50.0
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-- ****************
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-- Helper functions
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-- ****************
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-- calculate and show relative temperature
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function geothermometer.show_rel_temp(itemstack, user, pointed_thing)
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if pointed_thing.type ~= "node" then return nil end
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local player_name = user:get_player_name()
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local node_pos = vector.new(pointed_thing.under)
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local scan_vec = vector.new({x = scan_range, y = scan_range,
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z = scan_range})
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local scan_pos1 = vector.subtract(node_pos, scan_vec)
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local scan_pos2 = vector.add(node_pos, scan_vec)
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local water = minetest.find_nodes_in_area(scan_pos1, scan_pos2,
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{ "group:water" })
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local lava = minetest.find_nodes_in_area(scan_pos1, scan_pos2,
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{ "group:lava" })
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local temp_var = 0.0
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for _, v in ipairs(water) do
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local vd = vector.distance(node_pos, v)
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if vd <= scan_range then
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temp_var = temp_var - 1 / ( vd * vd )
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end
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end
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for _, v in ipairs(lava) do
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local vd = vector.distance(node_pos, v)
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if vd <= scan_range then
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temp_var = temp_var + 1 / ( vd * vd )
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end
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end
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minetest.chat_send_player(player_name,
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"Geothermometer: reading for this block is " ..
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string.format("%+.4f", temp_scale * temp_var))
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return nil
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end
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-- *************
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-- Register Tool
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-- *************
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minetest.register_tool("geothermometer:geothermometer", {
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description = "Geothermometer",
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wield_image = "geothermometer_hand.png",
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wield_scale = { x = 1, y = 1, z = 2 },
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inventory_image = "geothermometer_inv.png",
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stack_max = 1,
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range = tool_range,
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on_use = geothermometer.show_rel_temp
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})
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-- ************
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-- Craft Recipe
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-- ************
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minetest.register_craft({
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output = "geothermometer:geothermometer",
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type = "shaped",
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recipe = {
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{ "default:steel_ingot", "default:diamond", "default:steel_ingot" },
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{ "default:steel_ingot", "default:copper_ingot", "default:steel_ingot" },
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{ "default:mese_crystal", "default:gold_ingot", "default:mese_crystal" },
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},
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})
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