public override void Serialize(ParameterSet parm)
 {
     int index = 0;
     foreach (Actor trigger in triggers)
     {
         TriggerVolume triggerVolume = trigger.agents[0] as TriggerVolume; // shouldn't be any other agents attached...
         parm.SetPrefix("TriggerVolume" + index);
         parm.AddParm("", triggerVolume.Name);
         parm.AddParm("Position", trigger.PhysicsObject.Position);
         parm.AddParm("ModelName", trigger.modelInstance.model.Name);
         triggerVolume.Serialize(ref parm); // trigger type specific parameters
         parm.ClearPrefix();
         index++;
     }
 }