void ClearAllParticles(){
for (ParticlesIterator pIter = g_particles.begin(); pIter != g_particles.end(); ++pIter ) {
Particle* p = *(pIter);
if (p) {
delete p;
p = NULL;
}
}
g_particles.clear();
}
void removeFlagged()
{
for(Particles::iterator iter = removeList.begin();
iter != removeList.end();
++iter)
{
Particle *p = *iter;
_remove(p);
}
removeList.clear();
}