SoD Tower Example

#define USE_DYNAMIC_OBJECTS true

static const Float:TowerPositions[][6] = {
	{1.0, 2.0, 3.0, 4.0, 5.0, 6.0},
	{4.0, 5.0, 6.0, 7.0, 8.0, 9.0},
	{7.0, 8.0, 9.0, 10.0, 11.0, 12.0}
};

new TowerObjects[sizeof(TowerPositions)] = {INVALID_OBJECT_ID, ...};
new bool:HasPlayerDiscoveredTower[MAX_PLAYERS][sizeof(TowerPositions)];

public OnGameModeInit()
{
	LOAD_Towers();
	return 1;
}

LOAD_Towers()
{
	for(new i = 0; i < sizeof(TowerPositions); i++)
	{
		#if USE_DYNAMIC_OBJECTS == (true)
			TowerObjects[i] = CreateDynamicObject(3279, TowerPositions[i][0], TowerPositions[i][1], TowerPositions[i][2], TowerPositions[i][3], TowerPositions[i][4], TowerPositions[i][5]);
		#else
			TowerObjects[i] = CreateObject(3279, TowerPositions[i][0], TowerPositions[i][1], TowerPositions[i][2], TowerPositions[i][3], TowerPositions[i][4], TowerPositions[i][5]);
		#endif
	}
	return 1;
}

CMD:survey(playerid, params[])
{
	for(new i = 0; i < sizeof(TowerPositions); i++)
	{
		if(IsPlayerInRangeOfPoint(playerid, 5.0, TowerPositions[i][0], TowerPositions[i][1], TowerPositions[i][2]))
		{
			if(HasPlayerDiscoveredTower[playerid][i]) return SendClientMessage(playerid, -1, "You have already surveyed this tower.");
			HasPlayerDiscoveredTower[playerid][i] = true;
			SendClientMessage(playerid, -1, "You have surveyed this area.");
			return 1;
		}
	}
	SendClientMessage(playerid, -1, "You cannot survey this area from here. Look for a survey tower.");
	return 1;
}