Place tree logs as decorations.

We can vary the landscape a bit more by placing "fallen logs"
around the various forests. These decorations are quite fast
and will provide some gameplay value but are still more rare
than the corresponding trees, so they don't provide free
materials.

I've manually put the schematic as lua tables since these log
schematics are only 8 blocks. We vary the log lengths between
1 and 3 blocks by making the end blocks have a lower chance
of appearing.

Amount is varied by fill_ratio, except for acacia trees where
we reduce the scale, so that acacia logs show up near places with
acacia trees consistently.

Mushrooms are placed optionally on each log. We can't place
two different mushrooms on a log, so instead we opt to place
brown mushrooms on oak/appletree logs, brown mushrooms on
jungletree logs, and red mushrooms on pine logs. No mushrooms
are placed on acacia logs, as they occur in a dry biome,
savannah, and this adds a bit of biome diversity.

diff --git a/mods/default/mapgen.lua b/mods/default/mapgen.lua
index 9f96cc35ebeb58dd9c8df8191bcb493b83e6d187..43db2f210f47bf73fcc801fb20f380b8ae6e30b4 100644 (file)
--- a/mods/default/mapgen.lua
+++ b/mods/default/mapgen.lua
@@ -967,7 +967,7 @@ end
 function default.register_decorations()
        minetest.clear_registered_decorations()
 
-       -- Apple tree
+       -- Apple tree and log
 
        minetest.register_decoration({
                deco_type = "schematic",
@@ -988,7 +988,33 @@ function default.register_decorations()
                flags = "place_center_x, place_center_z",
        })
 
-       -- Jungle tree
+       minetest.register_decoration({
+               deco_type = "schematic",
+               place_on = {"default:dirt_with_grass"},
+               sidelen = 80,
+               fill_ratio = 0.0015,
+               biomes = {"deciduous_forest"},
+               y_min = 1,
+               y_max = 31000,
+               schematic = {
+                       size = { x = 3, y = 3, z = 1},
+                       data = {
+                               { name = "air", prob = 0 },
+                               { name = "air", prob = 0 },
+                               { name = "air", prob = 0 },
+                               { name = "default:tree", param2 = 12, prob = 191 },
+                               { name = "default:tree", param2 = 12 },
+                               { name = "default:tree", param2 = 12, prob = 127 },
+                               { name = "air", prob = 0 },
+                               { name = "flowers:mushroom_brown", prob = 63 },
+                               { name = "air", prob = 0 },
+                       },
+               },
+               flags = "place_center_x",
+               rotation = "random",
+       })
+
+       -- Jungle tree and log
 
        minetest.register_decoration({
                deco_type = "schematic",
@@ -1003,7 +1029,33 @@ function default.register_decorations()
                rotation = "random",
        })
 
-       -- Taiga and temperate coniferous forest pine tree
+       minetest.register_decoration({
+               deco_type = "schematic",
+               place_on = {"default:dirt_with_grass", "default:dirt"},
+               sidelen = 80,
+               fill_ratio = 0.01,
+               biomes = {"rainforest", "rainforest_swamp"},
+               y_min = 1,
+               y_max = 31000,
+               schematic = {
+                       size = { x = 3, y = 3, z = 1},
+                       data = {
+                               { name = "air", prob = 0 },
+                               { name = "air", prob = 0 },
+                               { name = "air", prob = 0 },
+                               { name = "default:jungletree", param2 = 12, prob = 191 },
+                               { name = "default:jungletree", param2 = 12 },
+                               { name = "default:jungletree", param2 = 12, prob = 127 },
+                               { name = "air", prob = 0 },
+                               { name = "flowers:mushroom_brown", prob = 127 },
+                               { name = "air", prob = 0 },
+                       },
+               },
+               flags = "place_center_x",
+               rotation = "random",
+       })
+
+       -- Taiga and temperate coniferous forest pine tree and log
 
        minetest.register_decoration({
                deco_type = "schematic",
@@ -1024,7 +1076,33 @@ function default.register_decorations()
                flags = "place_center_x, place_center_z",
        })
 
-       -- Acacia tree
+       minetest.register_decoration({
+               deco_type = "schematic",
+               place_on = {"default:dirt_with_snow", "default:dirt_with_grass"},
+               sidelen = 80,
+               fill_ratio = 0.003,
+               biomes = {"taiga", "coniferous_forest"},
+               y_min = 1,
+               y_max = 31000,
+               schematic = {
+                       size = { x = 3, y = 3, z = 1},
+                       data = {
+                               { name = "air", prob = 0 },
+                               { name = "air", prob = 0 },
+                               { name = "air", prob = 0 },
+                               { name = "default:pine_tree", param2 = 12, prob = 191 },
+                               { name = "default:pine_tree", param2 = 12 },
+                               { name = "default:pine_tree", param2 = 12, prob = 127 },
+                               { name = "air", prob = 0 },
+                               { name = "flowers:mushroom_red", prob = 127 },
+                               { name = "air", prob = 0 },
+                       },
+               },
+               flags = "place_center_x",
+               rotation = "random",
+       })
+
+       -- Acacia tree and log
 
        minetest.register_decoration({
                deco_type = "schematic",
@@ -1046,6 +1124,36 @@ function default.register_decorations()
                rotation = "random",
        })
 
+       minetest.register_decoration({
+               deco_type = "schematic",
+               place_on = {"default:dirt_with_dry_grass"},
+               sidelen = 16,
+               noise_params = {
+                       offset = 0,
+                       scale = 0.001,
+                       spread = {x = 250, y = 250, z = 250},
+                       seed = 2,
+                       octaves = 3,
+                       persist = 0.66
+               },
+               biomes = {"savanna"},
+               y_min = 1,
+               y_max = 31000,
+               schematic = {
+                       size = { x = 3, y = 2, z = 1},
+                       data = {
+                               { name = "air", prob = 0 },
+                               { name = "air", prob = 0 },
+                               { name = "air", prob = 0 },
+                               { name = "default:acacia_tree", param2 = 12, prob = 191 },
+                               { name = "default:acacia_tree", param2 = 12 },
+                               { name = "default:acacia_tree", param2 = 12, prob = 127 },
+                       },
+               },
+               flags = "place_center_x",
+               rotation = "random",
+       })
+
        -- Large cactus
 
        minetest.register_decoration({