/*Registers given force generator to apply to the particle*/
public void add(MyParticle particle, ParticleForceGenerator fg)
{
registration.setValues(particle, fg);
Registry.Add(registration);
listLength++;
}
/*Registers given force generator to apply to the particle*/
public void add(MyParticle particle, ParticleForceGenerator fg)
{
registration.setValues(particle, fg);
Registry.Add(registration);
listLength++;
}