papyrus generation

diff --git a/mods/default/mapgen.lua b/mods/default/mapgen.lua
index af94505a04f5856e8e26944b2d1155a8ec79a493..c6e7d24e09e1d424bae8a5018e6184f2f8f17ef9 100644 (file)
--- a/mods/default/mapgen.lua
+++ b/mods/default/mapgen.lua
@@ -68,13 +68,20 @@ local function generate_ore(name, wherein, minp, maxp, seed, chunks_per_volume,
        --print("generate_ore done")
 end
 
+local function make_papyrus(pos, size)
+       for y=0,size-1 do
+               local p = {x=pos.x, y=pos.y+y, z=pos.z}
+               minetest.env:set_node(p, {name="default:papyrus"})
+       end
+end
+
 minetest.register_on_generated(function(minp, maxp, seed)
        generate_ore("default:stone_with_coal", "default:stone", minp, maxp, seed,   1/8/8/8,    5, -31000,  64)
        generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+1, 1/16/16/16, 5,   -5,   7)
        generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+2, 1/12/12/12, 5, -16,   -5)
        generate_ore("default:stone_with_iron", "default:stone", minp, maxp, seed+3, 1/9/9/9,    5, -31000, -17)
-       -- Generate clay
        if maxp.y >= 2 and minp.y <= 0 then
+               -- Generate clay
                -- Assume X and Z lengths are equal
                local divlen = 4
                local divs = (maxp.x-minp.x)/divlen+1;
@@ -109,6 +116,31 @@ minetest.register_on_generated(function(minp, maxp, seed)
                        end
                end
                end
+               -- Generate papyrus
+               local perlin1 = minetest.env:get_perlin(354, 3, 0.7, 100)
+               -- Assume X and Z lengths are equal
+               local divlen = 8
+               local divs = (maxp.x-minp.x)/divlen+1;
+               for divx=0,divs-1 do
+               for divz=0,divs-1 do
+                       local x0 = minp.x + math.floor((divx+0)*divlen)
+                       local z0 = minp.z + math.floor((divz+0)*divlen)
+                       local x1 = minp.x + math.floor((divx+1)*divlen)
+                       local z1 = minp.z + math.floor((divz+1)*divlen)
+                       -- Determine papyrus amount from perlin noise
+                       local papyrus_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 45 - 20)
+                       -- Find random positions for papyrus based on this random
+                       local pr = PseudoRandom(seed+1)
+                       for i=0,papyrus_amount do
+                               local x = pr:next(x0, x1)
+                               local z = pr:next(z0, z1)
+                               if minetest.env:get_node({x=x,y=1,z=z}).name == "default:dirt_with_grass" and
+                                               minetest.env:find_node_near({x=x,y=1,z=z}, 1, "default:water_source") then
+                                       make_papyrus({x=x,y=2,z=z}, pr:next(2, 4))
+                               end
+                       end
+               end
+               end
        end
 end)