Weapon dot-to-target input

code/weapon/weapon.h

@@ -346,6 +346,7 @@ float weapon_get_lifetime_pct(const weapon& wp);
 float weapon_get_age(const weapon& wp);
 float weapon_get_viewing_angle(const weapon& wp);
 float weapon_get_apparent_size(const weapon& wp);
+float weapon_get_target_dot(const weapon& wp);
 
 float beam_get_warmup_lifetime_pct(const beam& wp);
 float beam_get_warmdown_lifetime_pct(const beam& wp);
@@ -798,7 +799,8 @@ struct weapon_info
 			>{}},
 			std::pair {"Parent Radius", modular_curves_submember_input<&weapon::objnum, &Objects, &object::parent, &Objects, &object::radius>{}},
 			std::pair {"Viewing Angle", modular_curves_functional_input<weapon_get_viewing_angle>{}},
-			std::pair {"Apparent Size", modular_curves_functional_input<weapon_get_apparent_size>{}}
+			std::pair {"Apparent Size", modular_curves_functional_input<weapon_get_apparent_size>{}},
+			std::pair {"Dot To Target", modular_curves_functional_input<weapon_get_target_dot>{}}
 	);
 
   public:

code/weapon/weapons.cpp

@@ -10283,4 +10283,25 @@ float weapon_get_apparent_size(const weapon& wp) {
 		wep_objp->radius * 2.0f,
 		g3_get_hfov(Eye_fov),
 		gr_screen.max_w) / i2fl(gr_screen.max_w);
+}
+
+float weapon_get_target_dot(const weapon& wp) {
+	object* wep_objp = &Objects[wp.objnum];
+
+	vec3d target_pos;
+
+	if(wp.homing_object != &obj_used_list && (wp.homing_object->type != 0))
+	{
+		if (!IS_VEC_NULL(&wp.homing_pos)) {
+			target_pos = wp.homing_pos;
+		}
+	} else if(wp.target_num > -1)
+	{
+		target_pos = Objects[wp.target_num].pos;
+	} else {
+		return 0.f;
+	}
+	vec3d dir;
+	vm_vec_sub(&dir, &wep_objp->pos, &target_pos);
+	return vm_vec_dot(&dir, &wep_objp->orient.vec.fvec);
 }