private static int calculateGenerationHeight(World world, int x, int z) {
        int y = world.getHeight();
        boolean foundGround = false;
        while (!foundGround && y-- >= 64)
        {
            Block blockAt = world.getBlockState(new BlockPos(x, y, z)).getBlock();
            foundGround =  blockAt == Blocks.WATER
                    || blockAt == Blocks.FLOWING_WATER
                    || blockAt == Blocks.GRASS
                    || blockAt == Blocks.SAND
                    || blockAt == Blocks.SNOW
                    || blockAt == Blocks.SNOW_LAYER
                    || blockAt == Blocks.GLASS
                    || blockAt == Blocks.DIRT
                    || blockAt == Blocks.MYCELIUM;
        }
        return y;
    }