VoxeLibre/mods/MAPGEN/mcl_geodes/init.lua

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local adjacents = {
vector.new(1,0,0),
vector.new(-1,0,0),
vector.new(0,0,1),
vector.new(0,0,-1),
vector.new(0,1,0),
vector.new(0,-1,0)
}
local function makegeode(pos,pr)
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local size = pr:next(2,8)
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local p1 = vector.offset(pos,-size,-size,-size)
local p2 = vector.offset(pos,size,size,size)
local nn = minetest.find_nodes_in_area(p1,p2,{"group:material_stone"})
table.sort(nn,function(a, b)
return vector.distance(pos, a) < vector.distance(pos, b)
end)
if not nn[1] then return end
for i=1,math.random(#nn) do
minetest.set_node(nn[i],{name="mcl_amethyst:amethyst_block"})
end
local nnn = minetest.find_nodes_in_area(p1,p2,{"mcl_amethyst:amethyst_block"})
for k,v in pairs(nnn) do
local all_amethyst = true
for kk,vv in pairs(adjacents) do
local pp = vector.add(v,vv)
local an = minetest.get_node(pp)
if an.name ~= "mcl_amethyst:amethyst_block" then
if minetest.get_item_group(an.name,"material_stone") > 0 then
minetest.set_node(pp,{name="mcl_amethyst:calcite"})
if pr:next(1,5) == 1 then
minetest.set_node(v,{name="mcl_amethyst:budding_amethyst_block"})
end
all_amethyst = false
elseif an.name ~= "mcl_amethyst:amethyst_block" and an.name ~= "air" then
all_amethyst = false
end
end
end
if all_amethyst then minetest.set_node(v,{name="air"}) end
end
local nnnn = minetest.find_nodes_in_area_under_air(p1,p2,{"mcl_amethyst:amethyst_block"})
for k,v in pairs(nnnn) do
local r = pr:next(1,50)
if r < 10 then
minetest.set_node(vector.offset(v,0,1,0),{name="mcl_amethyst:amethyst_cluster",param2=1})
end
end
end
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mcl_structures.register_structure("geode",{
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place_on = {"mcl_core:stone"},
spawn_by = {"air"},
num_spawn_by = 2,
fill_ratio = 0.002,
flags = "place_center_x, place_center_z, force_placement",
biomes = ocean_biomes,
y_max = mcl_vars.mg_overworld_max,
y_min = mcl_vars.mg_overworld_min,
filenames = schems,
y_offset = function(pr) return pr:next(-4,-2) end,
place_func = function(pos,def,pr)
local p = vector.new(pos.x + pr:next(-30,30),pos.y,pos.z + pr:next(-30,30))
makegeode(pos,pr)
end,
})