pocketmine\level\generator\object\BigTree::getLeafGroupLayerSize PHP Метод

    private function getLeafGroupLayerSize(int $y)
    {
        if ($y >= 0 and $y < $this->leafDistanceLimit) {
            return (int) ($y != $this->leafDistanceLimit - 1 ? 3 : 2);
        }
        return -1;
    }