Add weapon launch curve input 'Target Forward Speed'

code/ai/aiturret.cpp

@@ -2061,9 +2061,9 @@ bool turret_fire_weapon(int weapon_num,
 						subsys_index = ship_get_subsys_index(turret);
 						Assert( subsys_index != -1 );
 						if(wip->wi_flags[Weapon::Info_Flags::Flak]){			
-							send_flak_fired_packet( parent_objnum, subsys_index, weapon_objnum, flak_range, launch_curve_data.distance_to_target, launch_curve_data.target_radius );
+							send_flak_fired_packet( parent_objnum, subsys_index, weapon_objnum, flak_range, launch_curve_data.distance_to_target, launch_curve_data.target_radius, launch_curve_data.target_forward_speed );
 						} else {
-							send_turret_fired_packet( parent_objnum, subsys_index, weapon_objnum, launch_curve_data.distance_to_target, launch_curve_data.target_radius );
+							send_turret_fired_packet( parent_objnum, subsys_index, weapon_objnum, launch_curve_data.distance_to_target, launch_curve_data.target_radius, launch_curve_data.target_forward_speed );
 						}
 					}
 
@@ -2137,6 +2137,7 @@ void turret_swarm_fire_from_turret(turret_swarm_info *tsi)
 		tsi->turret->system_info->turret_num_firing_points,
 		0.f,
 		0.f,
+		0.f,
 	};
 
 	// create weapon and homing info
@@ -2188,7 +2189,7 @@ void turret_swarm_fire_from_turret(turret_swarm_info *tsi)
 
 			subsys_index = ship_get_subsys_index(tsi->turret);
 			Assert( subsys_index != -1 );
-			send_turret_fired_packet( tsi->parent_objnum, subsys_index, weapon_objnum, 0.f, 0.f);
+			send_turret_fired_packet( tsi->parent_objnum, subsys_index, weapon_objnum, 0.f, 0.f, 0.f);
 		}
 	}
 }
@@ -2361,16 +2362,19 @@ void ai_turret_execute_behavior(const ship *shipp, ship_subsys *ss)
 	float turret_barrel_length = -1.0f;
 
 	float target_radius = 0.f;
+	float target_forward_speed = 0.f;
 
 	if (lep != nullptr) {
 		target_radius = lep->radius;
+		target_forward_speed = lep->phys_info.fspeed;
 	}
 
 	// grab the data for the launch curve inputs
 	auto launch_curve_data = WeaponLaunchCurveData {
 			ss->system_info->turret_num_firing_points,
 			base_dist_to_enemy,
 			target_radius,
+			target_forward_speed,
 	};
 
 	//WMC - go through all valid weapons. Fire spawns if there are any.

code/network/multi.h

@@ -76,9 +76,10 @@ class player;
 // Version 60 - 3/27/2023 - Added generic lua data packet
 // Version 61 - 4/17/2023 - Added compatibility for whackable asteroids (added force)
 // Version 62 - 5/26/2025 - Added some modular curve input data to turret firing packets; 5/31/2025 - Added another input
+// Version 63 - 8/4/2026 - Added target forward speed to turret and flak fired packets
 // STANDALONE_ONLY
 
-#define MULTI_FS_SERVER_VERSION							62
+#define MULTI_FS_SERVER_VERSION							63
 
 #define MULTI_FS_SERVER_COMPATIBLE_VERSION			MULTI_FS_SERVER_VERSION
 

code/network/multimsgs.cpp

@@ -3317,7 +3317,7 @@ void process_countermeasure_fired_packet( ubyte *data, header *hinfo )
 }
 
 // send a packet indicating that a turret has been fired
-void send_turret_fired_packet( int ship_objnum, int subsys_index, int weapon_objnum, float dist_to_target, float target_radius )
+void send_turret_fired_packet( int ship_objnum, int subsys_index, int weapon_objnum, float dist_to_target, float target_radius, float target_forward_speed )
 {
 	int packet_size;
 	ushort pnet_signature;
@@ -3376,6 +3376,8 @@ void send_turret_fired_packet( int ship_objnum, int subsys_index, int weapon_obj
 	ADD_FLOAT(dist_to_target);
 
 	ADD_FLOAT(target_radius);
+
+	ADD_FLOAT(target_forward_speed);
 
 	multi_io_send_to_all(data, packet_size);
 
@@ -3398,6 +3400,7 @@ void process_turret_fired_packet( ubyte *data, header *hinfo )
 	float angle1, angle2;
 	float dist_to_target;
 	float target_radius;
+	float target_forward_speed;
 
 	// get the data for the turret fired packet
 	offset = HEADER_LENGTH;	
@@ -3415,6 +3418,7 @@ void process_turret_fired_packet( ubyte *data, header *hinfo )
 	GET_FLOAT( angle2 );
 	GET_FLOAT( dist_to_target );
 	GET_FLOAT( target_radius );
+	GET_FLOAT( target_forward_speed );
 	PACKET_SET_SIZE();				// move our counter forward the number of bytes we have read
 
 	// if we don't have a valid weapon index then bail
@@ -3463,6 +3467,7 @@ void process_turret_fired_packet( ubyte *data, header *hinfo )
 		ssp->system_info->turret_num_firing_points,
 		dist_to_target,
 		target_radius,
+		target_forward_speed,
 	};
 
 	// create the weapon object
@@ -8633,7 +8638,7 @@ void process_weapon_detonate_packet(ubyte *data, header *hinfo)
 }	
 
 // flak fired packet
-void send_flak_fired_packet(int ship_objnum, int subsys_index, int weapon_objnum, float flak_range, float dist_to_target, float target_radius)
+void send_flak_fired_packet(int ship_objnum, int subsys_index, int weapon_objnum, float flak_range, float dist_to_target, float target_radius, float target_forward_speed)
 {
 	int packet_size;
 	ushort pnet_signature;
@@ -8685,6 +8690,8 @@ void send_flak_fired_packet(int ship_objnum, int subsys_index, int weapon_objnum
 	ADD_FLOAT( dist_to_target );
 
 	ADD_FLOAT( target_radius );
+
+	ADD_FLOAT( target_forward_speed );
 
 	multi_io_send_to_all(data, packet_size);
 
@@ -8706,6 +8713,7 @@ void process_flak_fired_packet(ubyte *data, header *hinfo)
 	float flak_range;
 	float dist_to_target;
 	float target_radius;
+	float target_forward_speed;
 
 	// get the data for the turret fired packet
 	offset = HEADER_LENGTH;		
@@ -8718,6 +8726,7 @@ void process_flak_fired_packet(ubyte *data, header *hinfo)
 	GET_FLOAT( flak_range );
 	GET_FLOAT( dist_to_target );
 	GET_FLOAT( target_radius );
+	GET_FLOAT( target_forward_speed );
 	PACKET_SET_SIZE();				// move our counter forward the number of bytes we have read
 
 	// if we don't have a valid weapon index then bail
@@ -8765,6 +8774,7 @@ void process_flak_fired_packet(ubyte *data, header *hinfo)
 		ssp->system_info->turret_num_firing_points,
 		dist_to_target,
 		target_radius,
+		target_forward_speed,
 	};
 
 	// create the weapon object	

code/network/multimsgs.h

@@ -528,11 +528,11 @@ void send_weapon_detonate_packet(object *objp);
 void process_weapon_detonate_packet(ubyte *data, header *hinfo);
 
 // turret fired packet
-void send_turret_fired_packet( int objnum, int subsys_index, int weapon_objnum, float dist_to_target, float target_radius );
+void send_turret_fired_packet( int objnum, int subsys_index, int weapon_objnum, float dist_to_target, float target_radius, float target_forward_speed );
 void process_turret_fired_packet( ubyte *data, header *hinfo );
 
 // flak fired packet
-void send_flak_fired_packet(int ship_objnum, int subsys_index, int weapon_objnum, float flak_range, float dist_to_target, float target_radius );
+void send_flak_fired_packet(int ship_objnum, int subsys_index, int weapon_objnum, float flak_range, float dist_to_target, float target_radius, float target_forward_speed );
 void process_flak_fired_packet(ubyte *data, header *hinfo);
 
 // player pain packet

code/scripting/api/objs/subsystem.cpp

@@ -946,6 +946,7 @@ ADE_FUNC(fireWeapon, l_Subsystem, "[number TurretWeaponIndex = 1, number FlakRan
 		sso->ss->system_info->turret_num_firing_points,
 		0.f,
 		0.f,
+		0.f,
 	};
 
 	bool rtn = turret_fire_weapon(wnum, sso->ss, sso->objh.objnum, launch_curve_data, &gpos, &gvec, nullptr, flak_range);

code/ship/ship.cpp

@@ -12961,15 +12961,18 @@ int ship_fire_primary(object * obj, int force, bool rollback_shot)
 
 		int num_slots = pm->gun_banks[bank_to_fire].num_slots;
 		float target_radius = 0.f;
+		float target_forward_speed = 0.f;
 
 		if (aip->target_objnum >= 0) {
 			target_radius = Objects[aip->target_objnum].radius;
+			target_forward_speed = Objects[aip->target_objnum].phys_info.fspeed;
 		}
 
 		auto launch_curve_data = WeaponLaunchCurveData {
 			num_slots,
 			dist_to_target,
 			target_radius,
+			target_forward_speed,
 		};
 
 		// do timestamp stuff for next firing time
@@ -14257,15 +14260,18 @@ int ship_fire_secondary( object *obj, int allow_swarm, bool rollback_shot )
 
 		num_slots = pm->missile_banks[bank].num_slots;
 		float target_radius = 0.f;
+		float target_forward_speed = 0.f;
 
 		if (tinfo.objnum >= 0) {
 			target_radius = Objects[tinfo.objnum].radius;
+			target_forward_speed = Objects[tinfo.objnum].phys_info.fspeed;
 		}
 
 		auto launch_curve_data = WeaponLaunchCurveData {
 			num_slots,
 			dist_to_target,
 			target_radius,
+			target_forward_speed,
 		};
 
 		// determine if there is enough ammo left to fire weapons on this bank.  As with primary

code/weapon/weapon.h

@@ -370,6 +370,7 @@ struct WeaponLaunchCurveData {
 	int num_firepoints;
 	float distance_to_target;
 	float target_radius;
+	float target_forward_speed;
 };
 
 struct weapon_info;
@@ -748,7 +749,8 @@ struct weapon_info
 			},
 			std::pair {"Num Firepoints", modular_curves_submember_input<&WeaponLaunchCurveData::num_firepoints>{}},
 			std::pair {"Distance to Target", modular_curves_submember_input<&WeaponLaunchCurveData::distance_to_target>{}},
-			std::pair {"Target Radius", modular_curves_submember_input<&WeaponLaunchCurveData::target_radius>{}}
+			std::pair {"Target Radius", modular_curves_submember_input<&WeaponLaunchCurveData::target_radius>{}},
+			std::pair {"Target Forward Speed", modular_curves_submember_input<&WeaponLaunchCurveData::target_forward_speed>{}}
 	);
 
   public:
@@ -1033,6 +1035,7 @@ int weapon_create( const vec3d *pos,
 	const WeaponLaunchCurveData& launch_curve_data = WeaponLaunchCurveData {
 		0,
 		0.f,
+		0.f,
 		0.f
 	});
 void weapon_set_tracking_info(int weapon_objnum, int parent_objnum, int target_objnum, int target_is_locked = 0, ship_subsys *target_subsys = NULL);