Function FindSpawnHomingTarget

Descent3/WeaponFire.cpp:3242–3288

Returns a object to home on for spawned weapons

// Returns a object to home on for spawned weapons
object *FindSpawnHomingTarget(object *obj) {
  int i;
  float best_dist = MAX_HOMING_DIST / 2;
  int best_index = -1;
  object *weapon_parent = ObjGet(obj->parent_handle);

  for (i = 0; i <= Highest_object_index; i++) {
    if ((i != OBJNUM(weapon_parent)) && ((Objects[i].type == OBJ_ROBOT) || (Objects[i].type == OBJ_PLAYER) ||
                                         (Objects[i].type == OBJ_BUILDING && Objects[i].ai_info))) {
      if (BOA_IsVisible(obj->roomnum, Objects[i].roomnum)) {
        vector to_target = Objects[i].pos - obj->pos;

        if (Objects[i].effect_info && Objects[i].effect_info->type_flags & EF_CLOAKED)
          continue;

        if (ObjGet(obj->parent_handle) &&
            !AIObjEnemy(ObjGetUltimateParent(ObjGet(obj->parent_handle)), ObjGetUltimateParent(&Objects[i])))
          continue;

        float dist_to_target = vm_NormalizeVector(&to_target) - obj->size - Objects[i].size;

        if (dist_to_target < best_dist) {
          fvi_query fq;
          fvi_info hit_info;

          fq.p0 = &obj->pos;
          fq.startroom = obj->roomnum;
          fq.p1 = &Objects[i].pos;
          fq.rad = 0.0f;
          fq.thisobjnum = OBJNUM(obj);
          fq.ignore_obj_list = NULL;
          fq.flags = FQ_TRANSPOINT | FQ_CHECK_OBJS | FQ_ONLY_DOOR_OBJ | FQ_NO_RELINK;

          fvi_FindIntersection(&fq, &hit_info);
          if (hit_info.hit_type[0] == HIT_NONE) {
            best_index = i;
            best_dist = dist_to_target;
          }
        }
      }
    }
  }
  if (best_index >= 0)
    return &Objects[best_index];

  return NULL;
}

// Creates chidren from a dying weapon
void CreateImpactSpawnFromWeapon(object *obj, vector *normal) {