private function getAvailableBlockSpace(ChunkManager $level, Vector3 $from, Vector3 $to)
{
$count = 0;
$iter = new VectorIterator($level, $from, $to);
while ($iter->valid()) {
$iter->next();
$pos = $iter->current();
if (!isset($this->overridable[$level->getBlockIdAt($pos->x, $pos->y, $pos->z)])) {
return $count;
}
$count++;
}
return -1;
}
