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Strange Local Variable Issue

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Working with spunFin's heliParadrop script and running into an issue that appears to be mission related as opposed to script. Script basically spawns a chopper, flies by the players and drops paratroops on top of them.

I've narrowed the problem down a BIS function call.

hint format ["1 - %1 %2 %3",_grp2,_heli,_landingSpotPos];
//Wait till it's close enough
waitUntil{([_heli, _landingSpotPos] call BIS_fnc_distance2D)<_jumpDistanceFromTarget};
hint format ["2 - %1 %2 %3",_grp2,_heli,_landingSpotPos];

_grp2 is a previously created group for the paratroopers, _heli is a previously created group for the heli/crew, _landingSpotPos is the players location and _jumpDistanceFromTarget is the distance from the players the troopers are supposed to start spawning out of the chopper. With the hints I set up I'm seeing _grp 2 before the waituntil defined correctly (eg, 0 Bravo 4-3), but once the waitUntil completes and the 2nd hint fires, _grp is now <NULL-group>.

I've got no idea why...I've tried change _grp2 to another Local variable name or even a global variable name with the same results. Any thoughts?

---------- Post added at 18:23 ---------- Previous post was at 16:39 ----------

Yeah, I've really got no idea what the issue is now. I've even tried switching from a waitUntil to a while loop

while{([_heli, _landingSpotPos] call BIS_fnc_distance2D)>_jumpDistanceFromTarget} do { sleep 1;};

Same deal with the _grp2 being set to "<NULL-group>". Yet if I comment out that waitUntil (or while loop), I see the rest of the script run and the group name doesn't get changed.

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do you declare ?

private ["_grp2"]

it seems but i don't know why since a3, the variable prefix with "_" in somes cases, are not anymore private by default.

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Yes, it's declared private right at the start of the script.

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They are not alive at that point, it's just about to drop into the loop to spawn them. Here's the full script. I've discovered that the script actually works fine if I call it direct in an empty mission, so it's gotta be some sort of conflict in my mission I'm running, but I can't for the life of me even figure out how that could happen in that one line.

			***		ARMA3Alpha HELI PARADROP v1.0 - by SPUn / lostvar	***

				Spawns chopper which delivers paradrop group to scene

	Calling the script:

		default: 		nul = [this] execVM "LV\heliParadrop.sqf";

		custom: 		nul = [spot, side, allowDamage, captive, distance, direction, flyby, fly height, jump distance,
							group size, jump delay, open height, smokes, flares, chems, patrol, target, cycle, skills,
							group, custom init, ID, MP] execVM "LV\heliParadrop.sqf";


spot 	= 	drop spot 		(name of marker or object or unit, or position array) 									DEFAULT: --
side 	= 	1 or 2 or 3		(1 = west, 2 = east, 3 = independent)													DEFAULT: 2
allowDamage = 	true/false	(allow or disallow damage for chopper)													DEFAULT: true
captive 	= 	true/false 	(if true, enemies wont notice chopper) 													DEFAULT: false
distance 	= 	number 		(from how far chopper comes from) 														DEFAULT: 1500
direction 	= 	"random" or 0-360 (direction where chopper comes from, use quotes with random!) 					DEFAULT: "random"
flyby	=	true/false		(true = chopper just flies thru target, false = stays still while dropping units)		DEFAULT: true
fly height	= number 		(how high chopper flies)																DEFAULT: 200
jump distance =	number 		(how many meters before target location units starts jumping out of heli)				DEFAULT: 150
group size	= number 		(how many units is in para drop group)													DEFAULT: 8
jump delay	= number 		(how many seconds is the delay between jumps)											DEFAULT: 0.5
open height = number		(in which height units opens their parachutes)											DEFAULT: 50
smokes	=	true/false		(will units throw cover smokes (on 10m height))											DEFAULT: false
flares	=	true/false		(will units throw flares (on 30m height))												DEFAULT: false	
chems	=	true/false		(will units throw chemlights (on 30m height))											DEFAULT: false
patrol 	= 	true/false 		(if false, units wont patrol in any way <- handy if you set (group player) as *group) 	DEFAULT: true
target 	= 	patrol target 	(patrolling target for infantry group, options:											DEFAULT: player
						unit 	= 	units name, ex: enemyunit1
						marker 	= 	markers' name, ex: "marker01" (remember quotes with markers!)
						marker array = array of markers in desired order, ex: ["marker01","marker02","marker03"]
						group	= 	groups name, ex: (group enemy1)	OR BlueGroup17
						group array, ex: [(group player), (group blue2)]
						["PATROL",center position,radius] = uses patrol-vD.sqf, ex: ["PATROL",(getPos player),150]										
cycle 		= 	true or false (if true and target is array of markers, unit will cycle these markers) 				DEFAULT: false
skills 		= 	"default" 	(default AI skills) 																	DEFAULT: "default"
			or	number	=	0-1.0 = this value will be set to all AI skills, ex: 0.8
			or	array	=	all AI skills invidiually in array, values 0-1.0, order:
					[aimingAccuracy, aimingShake, aimingSpeed, spotDistance, spotTime, courage, commanding, general, endurance, reloadSpeed] 
					ex: 	[0.75,0.5,0.6,0.85,0.9,1,1,0.75,1,1] 
group 		= 	group name OR nil (if you want units in existing group, set it here. if this is left empty, new group is made) 	DEFAULT: nil
custom init = 	"init commands" (if you want something in init field of units, put it here) 									DEFAULT: nil
			NOTE: Keep it inside quotes, and if you need quotes in init commands, you MUST use ' or "" instead of ",
				ex: "hint 'this is hint';"
ID 			= 	number (if you want to delete units this script creates, you'll need ID number for them)						DEFAULT: nil
MP			= 	true/false	true = 'drop spot' will automatically be one of alive non-captive players							DEFAULT: false

EXAMPLE: 	nul = [player, 2, false, true, 1000, "random", true, 500, 200, 6, 1, 50, true, false, true, true, player, false, 0.75, nil, nil, 1,false] execVM "LV\heliParadrop.sqf";
if (!isServer)exitWith{};
private ["_mp","_grp","_heliType","_men","_grp2","_center","_man1","_man2","_landingSpot","_side","_flyHeight","_openHeight","_jumpDelay","_jumperAmount","_heliDistance","_heliDirection","_flyBy","_allowDamage","_BLUmen","_OPFmen","_INDmen","_BLUchopper","_OPFchopper","_INDchopper","_landingSpotPos","_spos","_heli","_crew","_dir","_flySpot","_jumpDistanceFromTarget","_captive","_smokes","_flares","_chems","_skls","_cPosition","_cRadius","_patrol","_target","_cycle","_skills","_customInit","_grpId","_wp0","_wp1","_doorHandling"];

//Extra settings:
_doorHandling = true;

_landingSpot = if (count _this > 0) then {_this select 0};
_side = if (count _this > 1) then {_this select 1}else{2};
_allowDamage = if (count _this > 2) then {_this select 2}else{true};
_captive = if (count _this > 3) then {_this select 3}else{false};
_heliDistance = if (count _this > 4) then {_this select 4}else{1500};
_heliDirection = if (count _this > 5) then {_this select 5}else{"random"};
_flyBy = if (count _this > 6) then {_this select 6}else{true};
_flyHeight = if (count _this > 7) then {_this select 7}else{200};
_jumpDistanceFromTarget = if (count _this > 8) then {_this select 8}else{150};
_jumperAmount = if (count _this > 9) then {_this select 9}else{8};
_jumpDelay = if (count _this > 10) then {_this select 10}else{0.5};
_openHeight = if (count _this > 11) then {_this select 11}else{50};
_smokes = if (count _this > 12) then {_this select 12}else{false};
_flares = if (count _this > 13) then {_this select 13}else{false};
_chems = if (count _this > 14) then {_this select 14}else{false};
_patrol = if (count _this > 15) then {_this select 15; }else{true;};
_target = if (count _this > 16) then {_this select 16; }else{player;};
_cycle = if (count _this > 17) then {_this select 17; }else{false;};
_skills = if (count _this > 18) then {_this select 18; }else{"default";};
_grp2 = if (count _this > 19) then {_this select 19; }else{nil;};
_customInit = if (count _this > 20) then {_this select 20; }else{nil;};
_grpId = if (count _this > 21) then { _this select 21;} else {nil};
_mp = if (count _this > 22) then { _this select 22;} else {false};

//Prepare functions:
if(isNil("LV_ACskills"))then{LV_ACskills = compile preprocessFile "LV\LV_functions\LV_fnc_ACskills.sqf";};
if(isNil("LV_vehicleInit"))then{LV_vehicleInit = compile preprocessFile "LV\LV_functions\LV_fnc_vehicleInit.sqf";};
if(_mp)then{if(isNil("LV_GetPlayers"))then{LV_GetPlayers = compile preprocessFile "LV\LV_functions\LV_fnc_getPlayers.sqf";};};

_BLUmen = ["B_Soldier_A_F","B_soldier_AR_F","B_medic_F","B_engineer_F","B_soldier_exp_F","B_Soldier_GL_F","B_soldier_M_F","B_soldier_AA_F","B_soldier_AT_F","B_officer_F","B_soldier_repair_F","B_Soldier_F","B_soldier_LAT_F","B_Soldier_lite_F","B_Soldier_SL_F","B_Soldier_TL_F","B_recon_exp_F","B_recon_JTAC_F","B_recon_M_F","B_recon_medic_F","B_recon_F","B_recon_LAT_F","B_recon_TL_F","B_soldier_AAR_F","B_soldier_AAA_F","B_soldier_AAT_F"];
_OPFmen = ["O_Soldier_A_F","O_soldier_AR_F","O_medic_F","O_engineer_F","O_soldier_exp_F","O_Soldier_GL_F","O_soldier_M_F","O_soldier_AA_F","O_soldier_AT_F","O_officer_F","O_soldier_repair_F","O_Soldier_F","O_soldier_LAT_F","O_Soldier_lite_F","O_Soldier_SL_F","O_Soldier_TL_F","O_recon_exp_F","O_recon_JTAC_F","O_recon_M_F","O_recon_medic_F","O_recon_F","O_recon_LAT_F","O_recon_TL_F","O_soldier_AAR_F","O_soldier_AAA_F","O_soldier_AAT_F"];
_INDmen = ["I_Soldier_A_F","I_soldier_AR_F","I_medic_F","I_engineer_F","I_soldier_exp_F","I_Soldier_GL_F","I_soldier_M_F","I_soldier_AA_F","I_soldier_AT_F","I_officer_F","I_soldier_repair_F","I_Soldier_F","I_soldier_LAT_F","I_Soldier_lite_F","I_Soldier_SL_F","I_Soldier_TL_F","I_soldier_AAR_F","I_soldier_AAA_F","I_soldier_AAT_F"];
_BLUchopper = "B_Heli_Transport_01_F";
_OPFchopper = "O_Heli_Light_02_unarmed_F";
_INDchopper = "I_Heli_Transport_02_F";

//Side related group creation:
case 1:{
	_center = createCenter west;
	_grp = createGroup west;
	if(isNil("_grp2"))then{_grp2 = createGroup west;}else{_grp2 = _grp2;};
	_men = _BLUmen;
	_heliType = _BLUchopper;
case 2:{
	_center = createCenter east;
	_grp = createGroup east;
	if(isNil("_grp2"))then{_grp2 = createGroup east;}else{_grp2 = _grp2;};
	_men = _OPFmen;
	_heliType = _OPFchopper;
case 3:{
	_center = createCenter resistance;
	_grp = createGroup resistance;
	if(isNil("_grp2"))then{_grp2 = createGroup resistance;}else{_grp2 = _grp2;};
	_men = _INDmen;
	_heliType = _INDchopper;

paraTroops = _grp2;

_landingSpot = call LV_GetPlayers;
_landingSpotPos = getPos(_landingSpot call BIS_fnc_selectRandom);
_landingSpot = _landingSpotPos;
//Check if target is marker/object/position
if(_landingSpot in allMapMarkers)then{
	_landingSpotPos = getMarkerPos _landingSpot;
	if (typeName _landingSpot == "ARRAY") then{
		_landingSpotPos = _landingSpot;
		_landingSpotPos = getPos _landingSpot;

//Spawn chopper
if(typeName _heliDirection == "STRING")then{_heliDirection = random 360;};
_spos = [(_landingSpotPos select 0) + (sin _heliDirection) * _heliDistance, (_landingSpotPos select 1) + (cos _heliDirection) * _heliDistance, _flyHeight];
_heli = createVehicle [_heliType, _spos, [], 0, "FLY"];
_heli allowDamage _allowDamage;
_crew = [_heli,_grp] call bis_fnc_spawncrew;
_heli setCaptive true;
{ _x setCaptive true; } forEach units _grp;
//NOTE! This next line should make sure AI does fly where it's set to fly, BUT in recent stable release
//AI sometimes acts weirdly while CARELESS, they might skip waypoints or domoves. 
//_grp setBehaviour "CARELESS";

//Count angle between chopper and target, and end spot for chopper
_dir = ((_landingSpotPos select 0) - (_spos select 0)) atan2 ((_landingSpotPos select 1) - (_spos select 1));
_flySpot = [(_landingSpotPos select 0) + (sin _dir) * _heliDistance, (_landingSpotPos select 1) + (cos _dir) * _heliDistance, _flyHeight];

//Heli to go
_wp0 = _grp addWaypoint [_landingSpotPos, 0, 1];
[_grp,0] setWaypointBehaviour "CARELESS";
[_grp,0] setWaypointCompletionRadius 60;
_wp1 = _grp addWaypoint [_flySpot, 0, 2];
[_grp,1] setWaypointBehaviour "CARELESS";
[_grp,1] setWaypointCompletionRadius 60;
_wp0 = _grp addWaypoint [_landingSpotPos, 0, 1];
[_grp,0] setWaypointBehaviour "CARELESS";
[_grp,0] setWaypointCompletionRadius 60;
_heli flyInHeight _flyHeight;

//Make heli & crew dissapear if something goes wrong or if heli is at its end spot
[_heli,_grp,_flySpot,_landingSpotPos,_heliDistance] spawn {
private ["_heli","_grp","_flySpot","_landingSpotPos","_heliDistance"];
_heli = _this select 0;
_grp = _this select 1;
_flySpot = _this select 2;
_landingSpotPos = _this select 3;
_heliDistance = _this select 4;
while{([_heli, _flySpot] call BIS_fnc_distance2D)>200}do{
	if(!alive _heli || !canMove _heli)exitWith{};
	sleep 5;
waitUntil{([_heli, _landingSpotPos] call BIS_fnc_distance2D)>(_heliDistance * .5)};
{ deleteVehicle _x; } forEach units _grp;
deleteVehicle _heli;

//Wait till it's close enough
waitUntil{([_heli, _landingSpotPos] call BIS_fnc_distance2D)<_jumpDistanceFromTarget};
hint format["%1",paraTroops];
//Create para group
for "_i" from 1 to _jumperAmount step 1 do{
_man1 = _men select (floor(random(count _men)));
_man2 = _grp2 createUnit [_man1, [(getPos _heli) select 0,(getPos _heli) select 1, ((getPos _heli) select 2) - 3], [], 0, "NONE"];
_man2 setPos [(getPos _heli) select 0,(getPos _heli) select 1, ((getPos _heli) select 2) - 3];
if(typeName _skills != "STRING")then{_skls = [_man2,_skills] call LV_ACskills;};
	[_man2,_customInit] spawn LV_vehicleInit;
[_man2,_heli,_openHeight,_smokes,_flares,_chems] spawn{
	private ["_man2","_heli","_openHeight","_para","_smokes","_flares","_chems","_smoke","_flare","_chem"];
	_man2 = _this select 0;
	_heli = _this select 1;
	_openHeight = _this select 2;
	_smokes = _this select 3;
	_flares = _this select 4;
	_chems = _this select 5;
	waitUntil{((getPos _man2)select 2)<_openHeight};
	_para = createVehicle ["NonSteerable_Parachute_F", position _man2, [], ((direction _heli)-25+(random 50)), 'NONE'];
	_para setPos (getPos _man2);
	_man2 moveInDriver _para;

		waitUntil{((getPos _man2)select 2)<10};
		_smoke = "SmokeShell" createVehicle (getPos _man2);
		waitUntil{((getPos _man2)select 2)<30};
		_flare = "F_40mm_Red" createVehicle [(getPos _man2) select 0,(getPos _man2) select 1,0]; //Chemlight_red
		waitUntil{((getPos _man2)select 2)<30};
		_chem = "Chemlight_red" createVehicle (getPos _man2);
_man2 allowFleeing 0;
sleep _jumpDelay;

call compile format ["LVgroup%1 = _grp2",_grpId];

//If it wasnt flyby, send heli to its end spot
_wp1 = _grp addWaypoint [_flySpot, 0, 2];
[_grp,1] setWaypointBehaviour "CARELESS";
[_grp,1] setWaypointCompletionRadius 60;

//Patrol stuff for para group (same as in reinforcementHeli, works but needs 'a bit' rework)
if(typeName _target == "ARRAY")then{ //TARGET is array
	if((!((_target select 0) in allMapMarkers))&&(!((_target select 0) in allGroups)))then{
		if((typeName (_target select 0)) == "STRING")then{
			if((_target select 0) == "PATROL")then{ ////USE patrol-vD.sqf
					_cPosition = _target select 1;
					_cRadius = _target select 2;
					nul = [_x,_cPosition,_cRadius,_doorHandling] execVM "LV\patrol-vD.sqf";
				}forEach units _grp2;
	}else{ //TARGET is array of Markers or Groups
			_x setVariable ["target0",_target,false];
			_x setVariable ["mDis0", 1000, false];
				nul = [_x,true] execVM "LV\LV_functions\LV_fnc_follow.sqf";
				nul = [_x,false] execVM "LV\LV_functions\LV_fnc_follow.sqf";
			sleep 2;
		}forEach units _grp2;
	if(_target in allMapMarkers)then{ /////TARGET is single Marker
		{ _x doMove getMarkerPos _target; } forEach units _grp2;
			{ ////TARGET is single Unit/Object
				_x setVariable ["target0",_target,false];
				_x setVariable ["mDis0", 1000, false];
				nul = [_x] execVM "LV\LV_functions\LV_fnc_follow.sqf";
			}forEach units _grp2;
//If patrol is set to false, units will idle. Additionally you can set custom actions here:


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im not sure to well understand but if you keep a group empty (with no alive unit) in it, it will be automaticaly delete after a time.

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That did the trick...must have been deleted during/after the Waituntil. I moved the group creation to right after that and it's working like a champ. Thanks mucho for the help!

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