working caves

decorations.lua

@@ -1,23 +1,2 @@
 
 -- decos for mars caves
-
-if minetest.get_modpath("bamboo") then
-	minetest.register_decoration({
-		deco_type = "schematic",
-		place_on = {"default:dirt_with_grass"},
-		sidelen = 16,
-		noise_params = {
-			offset = 0.005,
-			scale = 0.001,
-			spread = {x = 240, y = 240, z = 240},
-			seed = 2776,
-			octaves = 3,
-			persist = 0.65
-		},
-		biomes = {"grassland"},
-		y_min = planet_mars.y_start,
-		y_max = planet_mars.y_start + planet_mars.y_height,
-		schematic = bamboo.bambootree,
-		flags = "place_center_x, place_center_z",
-	})
-end

depends.txt

@@ -3,4 +3,3 @@ vacuum?
 bedrock?
 skybox?
 gravity_manager?
-bamboo?

mapgen.lua

@@ -155,16 +155,17 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	end --x
 	end --z
 
-	perlin_index = 1
+	local perlin_index_2d = 1
+	local perlin_index_3d = 1
 
 	-- generate caves
 	for z=minp.z,maxp.z do
 	for y=minp.y,maxp.y do
 	for x=minp.x,maxp.x do
 		local index = area:index(x,y,z)
 
-		local is_cave = math.abs(cave_perlin_map[perlin_index]) > 0.5
-		local is_cave_dirt = math.abs(cave_perlin_map[perlin_index]) < 0.55
+		local is_cave = math.abs(cave_perlin_map[perlin_index_3d]) > 0.5
+		local is_cave_dirt = math.abs(cave_perlin_map[perlin_index_3d]) < 0.55
 
 		local is_deep = y < (y_start + (y_height * 0.95))
 
@@ -176,7 +177,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 				if is_cave_dirt then
 
 					-- normalized factor from 0...1
-					local biome_perlin_factor = math.min(1, math.abs( biome_perlin_map[perlin_index] * 0.1 ) )
+					local biome_perlin_factor = math.min(1, math.abs( biome_perlin_map[perlin_index_2d] * 0.1 ) )
 
 					if biome_perlin_factor > 0.9 then
 						data[index] = c_base
@@ -207,8 +208,12 @@ minetest.register_on_generated(function(minp, maxp, seed)
 			end
 		end
 
-		perlin_index = perlin_index + 1
+		perlin_index_3d = perlin_index_3d + 1
+		perlin_index_2d = perlin_index_2d + 1
 	end --x
+
+	perlin_index_2d = z - minp.z + 1
+
 	end --y
 	end --z