Ore distribution: Deeper iron, diamond and mese block, tune gold (#2107)

Iron at y = 0 was far too easy to find.
Adjust gold lower region to be twice the depth of highest level, like
all other ores.
Diamond at y = -500 was too easy to progress to.
Make diamond and mese block deeper to create a depth progression from
mese crystal to diamond, to reflect tool progression.
This all creates a satisfying 2^n depth progression, with lower regions
being at twice the depth of highest levels.

diff --git a/mods/default/mapgen.lua b/mods/default/mapgen.lua
index 0ca7d02fd460212ab0afcbd579bb670387e4c3ef..96bfd2d73c39866bb135cfc534e264f597139872 100644 (file)
--- a/mods/default/mapgen.lua
+++ b/mods/default/mapgen.lua
@@ -576,7 +576,7 @@ function default.register_ores()
                clust_scarcity = 7 * 7 * 7,
                clust_num_ores = 5,
                clust_size     = 3,
-               y_max          = 0,
+               y_max          = -64,
                y_min          = -127,
        })
 
@@ -682,7 +682,7 @@ function default.register_ores()
                clust_num_ores = 3,
                clust_size     = 2,
                y_max          = -256,
-               y_min          = -1023,
+               y_min          = -511,
        })
 
        minetest.register_ore({
@@ -692,18 +692,18 @@ function default.register_ores()
                clust_scarcity = 13 * 13 * 13,
                clust_num_ores = 5,
                clust_size     = 3,
-               y_max          = -1024,
+               y_max          = -512,
                y_min          = -31000,
        })
 
-       -- Diamond
+       -- Mese crystal
 
        minetest.register_ore({
                ore_type       = "scatter",
-               ore            = "default:stone_with_diamond",
+               ore            = "default:stone_with_mese",
                wherein        = "default:stone",
-               clust_scarcity = 15 * 15 * 15,
-               clust_num_ores = 4,
+               clust_scarcity = 14 * 14 * 14,
+               clust_num_ores = 5,
                clust_size     = 3,
                y_max          = 31000,
                y_min          = 1025,
@@ -711,34 +711,34 @@ function default.register_ores()
 
        minetest.register_ore({
                ore_type       = "scatter",
-               ore            = "default:stone_with_diamond",
+               ore            = "default:stone_with_mese",
                wherein        = "default:stone",
-               clust_scarcity = 17 * 17 * 17,
-               clust_num_ores = 4,
-               clust_size     = 3,
+               clust_scarcity = 18 * 18 * 18,
+               clust_num_ores = 3,
+               clust_size     = 2,
                y_max          = -512,
                y_min          = -1023,
        })
 
        minetest.register_ore({
                ore_type       = "scatter",
-               ore            = "default:stone_with_diamond",
+               ore            = "default:stone_with_mese",
                wherein        = "default:stone",
-               clust_scarcity = 15 * 15 * 15,
-               clust_num_ores = 4,
+               clust_scarcity = 14 * 14 * 14,
+               clust_num_ores = 5,
                clust_size     = 3,
                y_max          = -1024,
                y_min          = -31000,
        })
 
-       -- Mese crystal
+       -- Diamond
 
        minetest.register_ore({
                ore_type       = "scatter",
-               ore            = "default:stone_with_mese",
+               ore            = "default:stone_with_diamond",
                wherein        = "default:stone",
-               clust_scarcity = 14 * 14 * 14,
-               clust_num_ores = 5,
+               clust_scarcity = 15 * 15 * 15,
+               clust_num_ores = 4,
                clust_size     = 3,
                y_max          = 31000,
                y_min          = 1025,
@@ -746,23 +746,23 @@ function default.register_ores()
 
        minetest.register_ore({
                ore_type       = "scatter",
-               ore            = "default:stone_with_mese",
+               ore            = "default:stone_with_diamond",
                wherein        = "default:stone",
-               clust_scarcity = 18 * 18 * 18,
-               clust_num_ores = 3,
-               clust_size     = 2,
-               y_max          = -512,
-               y_min          = -1023,
+               clust_scarcity = 17 * 17 * 17,
+               clust_num_ores = 4,
+               clust_size     = 3,
+               y_max          = -1024,
+               y_min          = -2047,
        })
 
        minetest.register_ore({
                ore_type       = "scatter",
-               ore            = "default:stone_with_mese",
+               ore            = "default:stone_with_diamond",
                wherein        = "default:stone",
-               clust_scarcity = 14 * 14 * 14,
-               clust_num_ores = 5,
+               clust_scarcity = 15 * 15 * 15,
+               clust_num_ores = 4,
                clust_size     = 3,
-               y_max          = -1024,
+               y_max          = -2048,
                y_min          = -31000,
        })
 
@@ -786,8 +786,8 @@ function default.register_ores()
                clust_scarcity = 36 * 36 * 36,
                clust_num_ores = 3,
                clust_size     = 2,
-               y_max          = -1024,
-               y_min          = -2047,
+               y_max          = -2048,
+               y_min          = -4095,
        })
 
        minetest.register_ore({
@@ -797,7 +797,7 @@ function default.register_ores()
                clust_scarcity = 28 * 28 * 28,
                clust_num_ores = 5,
                clust_size     = 3,
-               y_max          = -2048,
+               y_max          = -4096,
                y_min          = -31000,
        })
 end