NLAW - Improve missile behaviour (#11172)

* NLAW ammunition rework

NLAW now uses a submunition penetrator

* Fix AI inaccuracy

* Further ammo balance

* Seeker changes

Seeker looks at fire LOD, explosion delayed

* DA changes

Direct Attack no longer shoots the penetrator (it is always downwards), but deals more damage

* revert to submunitions, remove damage balancing

* Remove old comment

Author: rekterakathom

addons/nlaw/CfgAmmo.hpp

@@ -2,27 +2,25 @@ class ace_missileguidance_type_Nlaw;
 class CfgAmmo {
     class M_NLAW_AT_F;
     class ACE_NLAW: M_NLAW_AT_F {
-        hit = 400; // Default was 500
-        indirectHit = 20; // Default was 15
+        submunitionAmmo = "ACE_NLAW_Penetrator";
+        triggerOnImpact = 0; // The shaped charge only points downwards, so don't fire it in DA mode
+        maxSpeed = 200;
+        typicalSpeed = 185;
+        thrust = 400; // 400 * 0.5 == 200 - swift acceleration to expected speed
+        thrustTime = 0.5;
+        timeToLive = 5.6; // Time until self-destruction (1000 meters @ 200m/s when accounting for air friction)
+        warheadName = "HEAT";
         class ace_missileguidance: ace_missileguidance_type_Nlaw {
             enabled = 1;
         };
     };
 
-    // Sub ammos used in OTA mode (see fnc_seeker.sqf)
-    class ACE_NLAW_Explosion: ACE_NLAW { // Based on FCS-Airburst, will explode right away
-        timeToLive = 0;
-        model = "\A3\weapons_f\empty";
-    };
-    class ACE_NLAW_ShapedCharge: ACE_NLAW { // Shaped charge from rocket explosion, no effects
-        timeToLive = 1;
-        model = "\A3\weapons_f\empty";
-        hit = 750;
-        indirectHit = 0;
-        indirectHitRange = 0;
-        explosionSoundEffect = "";
-        explosionEffects = "";
-        CraterEffects = "";
-        muzzleEffect = "";
+    class ammo_Penetrator_NLAW;
+    class ACE_NLAW_Penetrator: ammo_Penetrator_NLAW {
+        // 500mm of RHA pen (manufacturer claim) - vanilla has 400mm of RHA pen (caliber 26.67)
+        // formula: typicalSpeed * caliber * 15 / 1000 
+        // -> 1000 * 33.333 * 15 / 1000 = ~500
+        caliber = 33.333;
+        warheadName = "HEAT";
     };
 };

addons/nlaw/functions/fnc_navigation_onFired.sqf

@@ -56,7 +56,7 @@ if (_shooter == ACE_player) then {
 //_pitchChange = -10 max _pitchChange min 10;
 
 ((velocity _projectile) call CBA_fnc_vect2polar) params ["", "_currentYaw", "_currentPitch"];
-((ACE_player weaponDirection (currentWeapon ACE_player)) call CBA_fnc_vect2Polar) params ["", "_yaw", "_pitch"];
+((_shooter weaponDirection (currentWeapon _shooter)) call CBA_fnc_vect2Polar) params ["", "_yaw", "_pitch"];
 
 TRACE_5("attackProfileStateParams",_firedLOS,_yawChange,_pitchChange,_currentPitch,_currentYaw);
 _navigationParams set [0, _yawChange];

addons/nlaw/functions/fnc_seeker.sqf

@@ -66,25 +66,16 @@ if ((_projPos distance _launchPos) >= 20) then {
         #endif
 
         // Limit scan to 5 meters directly down (shaped charge jet has a very limited range)
-        private _res = lineIntersectsSurfaces [_virtualPos, (_virtualPos vectorAdd [0,0,-5]), _projectile];
+        private _res = lineIntersectsSurfaces [_virtualPos, (_virtualPos vectorAdd [0,0,-5]), _projectile, objNull, true, 1, "FIRE", "VIEW"];
         if (_res isNotEqualTo []) then {
             (_res select 0) params ["_targetPos", "", "_target"];
             if ((_target isKindOf "Tank") || {_target isKindOf "Car"} || {_target isKindOf "Air"}) exitWith {
                 TRACE_3("Firing shaped charge down",_target,_targetPos distance _virtualPos,_frameDistance);
                 TRACE_2("",_target worldToModel (ASLToAGL _virtualPos),boundingBoxReal _target);
                 _virtualPos = _virtualPos vectorAdd (_vectorDir vectorMultiply 1.25);
 
-                deleteVehicle _projectile;
-
-                // Damage and effects of missile exploding (timeToLive is 0 so should happen next frame)
-                private _explosion = "ACE_NLAW_Explosion" createVehicle _virtualPos;
-                _explosion setPosASL _virtualPos;
-
-                // Just damage from shaped charge
-                private _shapedCharage = "ACE_NLAW_ShapedCharge" createVehicle _virtualPos;
-                _shapedCharage setPosASL _virtualPos;
-                _shapedCharage setVectorDirAndUp [[0,0,-1], [1,0,0]];
-                _shapedCharage setVelocity [0,0,-300];
+                _projectile setMissileTarget [_target, true];
+                triggerAmmo _projectile;
 
                 _seekerStateParams set [1, true];