Function DoExplosionFrame

Descent3/fireball.cpp:1707–1757

do whatever needs to be done for this explosion for this frame

}
// do whatever needs to be done for this explosion for this frame
void DoExplosionFrame(object *obj) {
  ASSERT(obj->control_type == CT_EXPLOSION);
  ASSERT(obj->type != OBJ_PLAYER);
  if (obj->id == GRAVITY_FIELD_INDEX) {
    DoGravityFieldEffect(obj);
  }

  // See if we should die of old age
  if (obj->lifeleft <= 0.0) {
    if (obj->id == GRAVITY_FIELD_INDEX) {
      // Create a big ass explosion
      if (OBJECT_OUTSIDE(obj))
        CreateBlastRing(&obj->pos, BLAST_RING_INDEX, DAMAGE_RING_TIME, obj->ctype.blast_info.max_size * 3, obj->roomnum,
                        1);
      else
        CreateBlastRing(&obj->pos, BLAST_RING_INDEX, DAMAGE_RING_TIME, obj->ctype.blast_info.max_size, obj->roomnum, 1);

      //	Blow the damn thing up and register a kill.

      float mag = vm_VectorDistanceQuick(&obj->pos, &Player_object->pos);
      if (mag > obj->ctype.blast_info.max_size)
        mag = 0;
      else
        mag = 1.0 - (mag / obj->ctype.blast_info.max_size);

      if (OBJECT_OUTSIDE(Viewer_object))
        AddToShakeMagnitude(mag * obj->ctype.blast_info.max_size * 5);
      else
        AddToShakeMagnitude(mag * obj->ctype.blast_info.max_size * 2);
      obj->impact_time = 0;
      obj->impact_size = obj->ctype.blast_info.max_size;
      obj->impact_force = obj->impact_size * 2;
      obj->impact_player_damage = obj->impact_size * 3;
      obj->impact_generic_damage = obj->impact_size * 3;

      if (Game_mode & GM_MULTI) // Do different damage to players if in multiplayer
        DoConcussiveForce(obj, obj->parent_handle, 1.0f / 5.0f);
      else
        DoConcussiveForce(obj, obj->parent_handle, 1.0);
      CreateRandomSparks(200, &obj->pos, obj->roomnum, -1, (ps_rand() % 2) + 2);

      int explode_visnum = CreateFireball(&obj->pos, BLUE_EXPLOSION_INDEX, obj->roomnum, VISUAL_FIREBALL);
      if (explode_visnum >= 0)
        VisEffects[explode_visnum].size = obj->ctype.blast_info.max_size;
    }

    // We died of old age
    SetObjectDeadFlag(obj);
    obj->lifeleft = 0.0;
  }
}
void MakeShockwave(object *explode_obj_ptr, int parent_handle) {
  if (explode_obj_ptr->impact_time > 0.0) {
    object *p = ObjGet(parent_handle);