Add patches of bare 'dry dirt' to savanna

Tune noise to appear roughly where long dry grass is least dense and shortest.

diff --git a/mods/default/mapgen.lua b/mods/default/mapgen.lua
index e930c24c1b52863c8fac3053ace67e9c094e158c..6d68afcf0f773c9cfba1a8cc05222d71f196bd94 100644 (file)
--- a/mods/default/mapgen.lua
+++ b/mods/default/mapgen.lua
@@ -1838,6 +1838,30 @@ end
 
 
 function default.register_decorations()
+       -- Savanna bare dirt patches.
+       -- Must come before all savanna decorations that are placed on dry grass.
+       -- Noise is similar to long dry grass noise, but scale inverted, to appear
+       -- where long dry grass is least dense and shortest.
+
+       minetest.register_decoration({
+               deco_type = "simple",
+               place_on = {"default:dry_dirt_with_dry_grass"},
+               sidelen = 4,
+               noise_params = {
+                       offset = -1.5,
+                       scale = -1.5,
+                       spread = {x = 200, y = 200, z = 200},
+                       seed = 329,
+                       octaves = 4,
+                       persist = 1.0
+               },
+               biomes = {"savanna"},
+               y_max = 31000,
+               y_min = 1,
+               decoration = "default:dry_dirt",
+               place_offset_y = -1,
+               flags = "force_placement",
+       })
 
        -- Apple tree and log