void TrackObjectManager::handleExplosion(const Vec3 &pos, const PhysicalObject *mp,
                                         bool secondary_hits)
{
    TrackObject* curr;
    for_in (curr, m_all_objects)
    {
        if(secondary_hits || mp == curr->getPhysics())
            curr->handleExplosion(pos, mp == curr->getPhysics());
    }
}   // handleExplosion