Generate netherrack and ores under the lava

another hack using minetest.generate_ores this time

mods/MAPGEN/mcl_biomes/init.lua

@@ -1545,6 +1545,19 @@ local function register_dimension_biomes()
 		flags = "all_ceilings",
 		param2 = 0,
 	})
+	minetest.register_decoration({
+		deco_type = "simple",
+		place_on = {"mcl_core:bedrock"},
+		sidelen = 16,
+		fill_ratio = 10,
+		y_min = mcl_vars.mg_nether_min - 10,
+		y_max = mcl_vars.mg_lava_nether_max,
+		height = 7,
+		max_height = 14,
+		decoration = "mcl_nether:netherrack",
+		flags = "all_floors,force_placement",
+		param2 = 0,
+	})
 
 
 	minetest.register_biome({
@@ -1570,7 +1583,7 @@ local function register_dimension_biomes()
 		sidelen = 16,
 		fill_ratio = 10,
 		biomes = { "Nether" },
-		y_min = -31000,
+		y_min = mcl_vars.mg_lava_nether_max,
 		y_max = mcl_vars.mg_nether_deco_max,
 		decoration = "mcl_nether:netherrack",
 		flags = "all_floors",
@@ -1586,7 +1599,6 @@ local function register_dimension_biomes()
 		node_river_water = "air",
 		node_cave_liquid = "air",
 		y_min = mcl_vars.mg_nether_min,
-
 		y_max = mcl_vars.mg_nether_max + 80,
 		heat_point = 77,
 		humidity_point = 33,
@@ -1599,7 +1611,7 @@ local function register_dimension_biomes()
 		sidelen = 16,
 		fill_ratio = 10,
 		biomes = { "SoulsandValley" },
-		y_min = -31000,
+		y_min = mcl_vars.mg_lava_nether_max,
 		y_max = mcl_vars.mg_nether_deco_max,
 		decoration = "mcl_blackstone:soul_soil",
 		flags = "all_floors, all_ceilings",
@@ -1614,7 +1626,7 @@ local function register_dimension_biomes()
 		clust_num_ores = 225,
 		clust_size     = 15,
 		biomes = { "SoulsandValley" },
-		y_min = mcl_vars.mg_nether_min,
+		y_min = mcl_vars.mg_lava_nether_max,
 		y_max = mcl_vars.mg_nether_deco_max,
 		noise_params = {
 			offset  = 0,
@@ -1636,7 +1648,6 @@ local function register_dimension_biomes()
 		node_river_water = "air",
 		node_cave_liquid = "air",
 		y_min = mcl_vars.mg_nether_min,
-
 		y_max = mcl_vars.mg_nether_max + 80,
 		heat_point = 60,
 		humidity_point = 47,
@@ -1649,7 +1660,7 @@ local function register_dimension_biomes()
 		sidelen = 16,
 		fill_ratio = 10,
 		biomes = { "CrimsonForest" },
-		y_min = -31000,
+		y_min = mcl_vars.mg_lava_nether_max,
 		y_max = mcl_vars.mg_nether_deco_max,
 		decoration = "mcl_crimson:crimson_nylium",
 		flags = "all_floors",
@@ -1676,7 +1687,7 @@ local function register_dimension_biomes()
 		sidelen = 16,
 		fill_ratio = 10,
 		biomes = { "WarpedForest" },
-		y_min = -31000,
+		y_min = mcl_vars.mg_lava_nether_max,
 		y_max = mcl_vars.mg_nether_deco_max,
 		decoration = "mcl_crimson:warped_nylium",
 		flags = "all_floors",
@@ -1704,7 +1715,7 @@ local function register_dimension_biomes()
 		sidelen = 16,
 		fill_ratio = 10,
 		biomes = { "BasaltDelta" },
-		y_min = -31000,
+		y_min = mcl_vars.mg_lava_nether_max,
 		y_max = mcl_vars.mg_nether_deco_max,
 		decoration = "mcl_blackstone:basalt",
 		flags = "all_floors",
@@ -1714,12 +1725,12 @@ local function register_dimension_biomes()
 	minetest.register_ore({
 	ore_type       = "blob",
 	ore            = "mcl_blackstone:blackstone",
-	wherein        =  {"mcl_nether:netherrack","mcl_nether:glowstone","mcl_core:gravel","mcl_nether:soul_sand"},
+	wherein        =  {"mcl_nether:netherrack","mcl_nether:glowstone","mcl_core:gravel"},
 	clust_scarcity = 100,
 	clust_num_ores = 400,
 	clust_size     = 20,
 	biomes = { "BasaltDelta" },
-	y_min = mcl_vars.mg_nether_min,
+	y_min = mcl_vars.mg_lava_nether_max,
 	y_max = mcl_vars.mg_nether_deco_max,
 	noise_params = {
 		offset  = 0,

mods/MAPGEN/mcl_mapgen_core/api.lua

@@ -15,7 +15,7 @@ minetest.register_on_generated(function(minp, maxp, blockseed)
 	local t1 = os.clock()
 	local p1, p2 = {x=minp.x, y=minp.y, z=minp.z}, {x=maxp.x, y=maxp.y, z=maxp.z}
 	if lvm > 0 then
-		local lvm_used, shadow, deco_used, deco_table = false, false, false, false
+		local lvm_used, shadow, deco_used, deco_table, ore_used, ore_table = false, false, false, false, false, false
 		local lb2 = {} -- param2
 		local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
 		local e1, e2 = {x=emin.x, y=emin.y, z=emin.z}, {x=emax.x, y=emax.y, z=emax.z}
@@ -28,7 +28,7 @@ minetest.register_on_generated(function(minp, maxp, blockseed)
 
 		for _, rec in ipairs(registered_generators) do
 			if rec.vf then
-				local lvm_used0, shadow0, deco = rec.vf(vm, data, data2, e1, e2, area, p1, p2, blockseed)
+				local lvm_used0, shadow0, deco, ore = rec.vf(vm, data, data2, e1, e2, area, p1, p2, blockseed)
 				if lvm_used0 then
 					lvm_used = true
 				end
@@ -40,6 +40,11 @@ minetest.register_on_generated(function(minp, maxp, blockseed)
 				elseif deco then
 					deco_used = true
 				end
+				if ore and type(ore) == "table" then
+					ore_table = ore
+				elseif deco then
+					ore_used = true
+				end
 			end
 		end
 
@@ -54,6 +59,11 @@ minetest.register_on_generated(function(minp, maxp, blockseed)
 			elseif deco_used then
 				minetest.generate_decorations(vm)
 			end
+			if ore_table then
+				minetest.generate_ores(vm,vector.new(minp.x,ore_table.min,minp.z),vector.new(maxp.x,ore_table.max,maxp.z))
+			elseif ore_used then
+				minetest.generate_ores(vm)
+			end
 			vm:calc_lighting(p1, p2, shadow)
 			vm:write_to_map()
 			vm:update_liquids()

mods/MAPGEN/mcl_mapgen_core/init.lua

@@ -333,10 +333,15 @@ local function world_structure(vm, data, data2, emin, emax, area, minp, maxp, bl
 		end
 	end
 	local deco = false
+	local ores = false
 	if minp.y >  mcl_vars.mg_nether_deco_max - 64 and maxp.y <  mcl_vars.mg_nether_max + 128 then
 		deco = {min=mcl_vars.mg_nether_deco_max,max=mcl_vars.mg_nether_max}
 	end
-	return lvm_used, lvm_used, deco
+	if minp.y <  mcl_vars.mg_nether_min + 10 or maxp.y <  mcl_vars.mg_nether_min + 60 then
+		deco = {min=mcl_vars.mg_nether_min - 10,max=mcl_vars.mg_nether_min + 20}
+		ores = {min=mcl_vars.mg_nether_min - 10,max=mcl_vars.mg_nether_min + 20}
+	end
+	return lvm_used, lvm_used, deco, ores
 end
 
 local function block_fixes(vm, data, data2, emin, emax, area, minp, maxp, blockseed)