void Server::sendMetadataChanged(const std::list<v3s16> &meta_updates, float far_d_nodes)
{
	float maxd = far_d_nodes * BS;
	NodeMetadataList *meta_updates_list = new NodeMetadataList();

	std::vector<u16> clients = m_clients.getClientIDs();
	for (std::vector<u16>::iterator i = clients.begin();
			i != clients.end(); ++i) {
		meta_updates_list->clear();
		Player *player = m_env->getPlayer(*i);
		m_clients.lock();
		RemoteClient* client = m_clients.lockedGetClientNoEx(*i);
		if (client != 0) {
			if (client->net_proto_version >= 28) {
				for (std::list<v3s16>::const_iterator i2 = meta_updates.begin();
						i2 != meta_updates.end(); ++i2) {
					v3s16 pos = *i2;
					NodeMetadata *meta = m_env->getMap().getNodeMetadata(pos);
					if (!meta) {
						continue;
					}
					if (player) {
						// If player is far away, only set modified blocks not sent
						v3f player_pos = player->getPosition();
						if (player_pos.getDistanceFrom(intToFloat(pos, BS)) > maxd) {
							client->SetBlockNotSent(getNodeBlockPos(pos));
							continue;
						}
					}
					meta_updates_list->set(pos, meta);
				}
				//here will go the packet sending
			} else {
				// Older clients expect whole blocks, set them not sent
				for (std::list<v3s16>::const_iterator i2 = meta_updates.begin();
						i2 != meta_updates.end(); ++i2) {
					v3s16 pos = *i2;
					client->SetBlockNotSent(getNodeBlockPos(pos));
				}
			}
		}
		m_clients.unlock();
	}
}