Core/Script: add script hook to allow overriding of a vehicle passenger's exit position

Port From (https://github.com/TrinityCore/TrinityCore/commit/1edd93bc0c443cdabc104af9f440e07b6d473a08)

Source/Game/Entities/Unit/Unit.cs

@@ -994,18 +994,23 @@ namespace Game.Entities
 
             SetControlled(false, UnitState.Root);      // SMSG_MOVE_FORCE_UNROOT, ~MOVEMENTFLAG_ROOT
 
-            Position pos;
-            if (exitPosition == null)                          // Exit position not specified
-                pos = vehicle.GetBase().GetPosition();  // This should use passenger's current position, leaving it as it is now
-            // because we calculate positions incorrect (sometimes under map)
-            else
-                pos = exitPosition;
-
             AddUnitState(UnitState.Move);
 
             if (player != null)
                 player.SetFallInformation(0, GetPositionZ());
 
+            Position pos;
+            // If we ask for a specific exit position, use that one. Otherwise allow scripts to modify it
+            if (exitPosition != null)
+                pos = exitPosition;
+            else
+            {
+                // Set exit position to vehicle position and use the current orientation
+                pos = vehicle.GetBase().GetPosition();
+                pos.SetOrientation(GetOrientation());
+                Global.ScriptMgr.ModifyVehiclePassengerExitPos(this, vehicle, pos);
+            }
+
             float height = pos.GetPositionZ() + vehicle.GetBase().GetCollisionHeight();
 
             MoveSplineInit init = new(this);
@@ -1015,7 +1020,7 @@ namespace Game.Entities
                 init.SetFall();
 
             init.MoveTo(pos.GetPositionX(), pos.GetPositionY(), height, false);
-            init.SetFacing(GetOrientation());
+            init.SetFacing(pos.GetOrientation());
             init.SetTransportExit();
             GetMotionMaster().LaunchMoveSpline(init, EventId.VehicleExit, MovementGeneratorPriority.Highest);
 

Source/Game/Scripting/CoreScripts.cs

@@ -303,6 +303,9 @@ namespace Game.Scripting
 
         // Called when Spell Damage is being Dealt
         public virtual void ModifySpellDamageTaken(Unit target, Unit attacker, ref int damage, SpellInfo spellInfo) { }
+
+        // Called when an unit exits a vehicle
+        public virtual void ModifyVehiclePassengerExitPos(Unit passenger, Vehicle vehicle, Position pos) { }
     }
 
     public class GenericCreatureScript<AI> : CreatureScript where AI : CreatureAI

Source/Game/Scripting/ScriptManager.cs

@@ -1100,6 +1100,10 @@ namespace Game.Scripting
             ForEach<UnitScript>(p => p.ModifySpellDamageTaken(target, attacker, ref dmg, spellInfo));
             damage = dmg;
         }
+        public void ModifyVehiclePassengerExitPos(Unit passenger, Vehicle vehicle, Position pos)
+        {
+            ForEach<UnitScript>(p => p.ModifyVehiclePassengerExitPos(passenger, vehicle, pos));
+        }
 
         // AreaTriggerEntityScript
         public AreaTriggerAI GetAreaTriggerAI(AreaTrigger areaTrigger)