minetest.register_on_generated(function(minp, maxp, seed)


local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
local area = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
local data = vm:get_data()
-- Decoration
for z = minp.z, maxp.z do
	for x = minp.x, maxp.x do
		local ivm = area:index(x, minp.y-1, z)
		for y = minp.y-1, maxp.y+1 do
			if data[ivm] == minetest.get_content_id("default:air") then
			data[ivm] = minetest.get_content_id("default:bush_leaves")
			end
		end
	end
end

	vm:set_data(data)
	--calc lighting
	vm:set_lighting({day=0, night=0})
	vm:calc_lighting()
	--write it to world
	vm:write_to_map(data)
end
)