Function CreateImpactSpawnFromWeapon

Descent3/WeaponFire.cpp:3291–3353

Creates chidren from a dying weapon

// Creates chidren from a dying weapon
void CreateImpactSpawnFromWeapon(object *obj, vector *normal) {
  int n = obj->id;
  object *home_target = NULL;

  ASSERT(Weapons[n].spawn_count > 0 && Weapons[n].spawn_handle >= 0);

  int num = Weapons[n].spawn_count;
  int spawn_index = Weapons[n].spawn_handle;

  // See if we should spawn the alternate
  if (Weapons[n].alternate_spawn_handle >= 0 && Weapons[n].alternate_chance > 0) {
    if ((ps_rand() % 100) < Weapons[n].alternate_chance)
      spawn_index = Weapons[n].alternate_spawn_handle;
  }

  if (Game_mode & GM_MULTI)
    ps_srand(num);

  if (Weapons[n].flags & WF_HOMING_SPLIT) {
    home_target = FindSpawnHomingTarget(obj);
  }

  for (int i = 0; i < num; i++) {
    if (home_target != NULL) {
      vector subvec = home_target->pos - obj->pos;
      float mag = vm_GetMagnitudeFast(&subvec);
      subvec /= mag;

      int objnum = CreateAndFireWeapon(&obj->pos, &subvec, obj, spawn_index);

      // Stagger the weapons a bit
      if (objnum > -1) {
        object *created_obj = &Objects[objnum];

        float scalar = .2 + ((float)(ps_rand() % 1000) / 1000.0);

        created_obj->mtype.phys_info.velocity *= scalar;
      }
    } else {
      matrix temp_mat;
      matrix rot_mat;
      vector new_norm;

      float norm = ((float)(ps_rand() % 1000)) / 1000.0;
      int x_twist = 16384 - (norm * 32768);
      if (x_twist < 0)
        x_twist = 65536 + x_twist;

      norm = ((float)(ps_rand() % 1000)) / 1000.0;
      int y_twist = 16384 - (norm * 32768);
      if (y_twist < 0)
        y_twist = 65536 + y_twist;

      vm_VectorToMatrix(&rot_mat, normal, NULL, NULL);
      vm_TransposeMatrix(&rot_mat);
      vm_AnglesToMatrix(&temp_mat, x_twist, y_twist, 0);

      new_norm = temp_mat.fvec * rot_mat;