implement LOS guidance and Bang-Bang control

addons/missileguidance/ACE_GuidanceConfig.hpp

@@ -93,9 +93,11 @@ class GVAR(SeekerTypes) {
 };
 
 class GVAR(NavigationTypes) {
-    class ProportionalNavigation {
-        name = "Proportional Navigation";
-        
+    class LineOfSight {
+        functionName = QFUNC(navigationType_lineOfSight);
+        onFired = QFUNC(lineOfSight_onFired);
+    };
+    class ProportionalNavigation {       
         functionName = QFUNC(navigationType_proNav);
         onFired = QFUNC(proNav_onFired);
     };

addons/missileguidance/CfgAmmo.hpp

@@ -72,6 +72,8 @@ class CfgAmmo {
             pitchRate = 40; // degrees per second
             yawRate = 40;
 
+            bangBangGuidance = 0;
+
             canVanillaLock = 0;
 
             // Guidance type for munitions

addons/missileguidance/XEH_PREP.hpp

@@ -31,6 +31,7 @@ PREP(attackProfile_JAV_TOP);
 
 // Navigation Profiles
 PREP(navigationType_proNav);
+PREP(navigationType_lineOfSight)
 
 // Seeker search functions
 PREP(seekerType_SALH);
@@ -47,3 +48,4 @@ PREP(ahr_onFired);
 
 // Navigation OnFired
 PREP(proNav_onFired);
+PREP(lineOfSight_onFired);

addons/missileguidance/functions/fnc_guidancePFH.sqf

@@ -66,8 +66,16 @@ if ((_pitchRate != 0 || {_yawRate != 0}) && {_profileAdjustedTargetPos isNotEqua
 
         // controls are either on or off, no proportional
         if (_isBangBangGuidance) then {
-            private _pitchSign = _clampedPitch / abs _clampedPitch;
-            private _yawSign = _clampedYaw / abs _clampedYaw;
+            private _pitchSign = if (_clampedPitch == 0) then {
+                0
+            } else {
+                _clampedPitch / abs _clampedPitch
+            };
+            private _yawSign = if (_clampedYaw == 0) then {
+                0
+            } else {
+                _clampedYaw / abs _clampedYaw
+            };
             _clampedPitch = _pitchSign * _pitchRate;
             _clampedYaw = _yawSign * _clampedYaw;
         };

addons/missileguidance/functions/fnc_lineOfSight_onFired.sqf

@@ -0,0 +1,24 @@
+#include "script_component.hpp"
+/*
+ * Author: Brandon (TCVM)
+ * Sets up LOS navigation state arrays (called from missileGuidance's onFired).
+ *
+ * Arguments:
+ * Guidance Arg Array <ARRAY>
+ *
+ * Return Value:
+ * None
+ *
+ * Example:
+ * [] call ace_missileguidance_fnc_proNav_onFired
+ *
+ * Public: No
+ */
+params ["_firedEH", "", "", "", "_stateParams"];
+_firedEH params ["_shooter","","","","_ammo","","_projectile"];
+_launchParams params ["_shooter","_targetLaunchParams","_seekerType","_attackProfile","_lockMode","_laserInfo","_navigationType"];
+_targetLaunchParams params ["_target", "_targetPos", "_launchPos"];
+_stateParams params ["_lastRunTime", "_seekerStateParams", "_attackProfileStateParams", "_lastKnownPosState","_navigationParams"];      
+_seekerParams params ["_seekerAngle", "_seekerAccuracy", "_seekerMaxRange", "_seekerMinRange"];
+
+_stateParams set [4, [[0, 0, 0]]];

addons/missileguidance/functions/fnc_navigationType_lineOfSight.sqf

@@ -0,0 +1,43 @@
+#include "script_component.hpp"
+/*
+ * Author: Brandon (TCVM)
+ * Projectile will take the direct LOS path to target
+ *
+ * Arguments:
+ * Guidance Arg Array <ARRAY>
+ *
+ * Return Value:
+ * Commanded acceleration normal to LOS in world space <ARRAY>
+ *
+ * Example:
+ * [] call ace_missileguidance_fnc_navigationType_lineOfSight
+ *
+ * Public: No
+ */
+params ["_args", "_timestep", "_seekerTargetPos", "_profileAdjustedTargetPos"];
+_args params ["_firedEH", "", "", "", "_stateParams"];
+_firedEH params ["","","","","","","_projectile"];
+_stateParams params ["", "", "", "","_navigationParams"];
+_navigationParams params ["_lastLineOfSight"];
+
+// LOS navigation implemented via https://apps.dtic.mil/sti/pdfs/ADA481330.pdf (called bang-bang)
+
+private _closingVelocity = vectorMagnitude velocity _projectile;
+private _lineOfSight = vectorNormalized (_profileAdjustedTargetPos vectorDiff getPosASLVisual _projectile);
+
+// the los rate is tiny, so we multiply by a constant of a power of ten to get more aggressive acceleration
+// this is just due to how we measure our LOS delta, the vectors involved are _tiny_
+private _losDelta = _lineOfSight vectorDiff _lastLineOfSight;
+private _losRate = 1000 * (vectorMagnitude _losDelta) / _timestep;
+
+private _commandedAcceleration = _closingVelocity vectorMultiply _losRate;
+
+// we need acceleration normal to our LOS
+private _commandedAccelerationProjected = _lineOfSight vectorMultiply (_commandedAcceleration vectorDotProduct _lineOfSight);
+_commandedAcceleration = _commandedAcceleration vectorDiff _commandedAccelerationProjected;
+
+if (accTime > 0) then {
+	_navigationParams set [0, _lineOfSight];
+};
+
+_commandedAcceleration

addons/missileguidance/todo.txt

@@ -0,0 +1,29 @@
+Weapon Configs:
+    Hellfire - Laser
+    AGM-65 - Laser
+    DAGR - Laser
+    GBU-12 - Laser
+
+    Dragon - SACLOS
+    Metis - SACLOS
+    HOT - SACLOS
+
+    Javelin - Optical
+    NLAW - PLOS
+
+Seeker Types:
+    Laser - causes lots of weapon noise, causing bad guidance
+
+Navigation Types:
+    GBU-12 - LOS Guidance
+    NLAW - LOS Guidance
+    Dragon - LOS Guidance
+    Metis - LOS Guidance
+    HOT - LOS Guidance
+
+    Javelin - Pro Nav
+    Hellfire - Pro Nav
+    AGM-65 - Pro Nav
+    DAGR - Pro Nav
+
+