public void AddParticleCluster(DuckieParticleCluster particleCluster)
 {
     if (_particleClusters == null) {
         _particleClusters = new List<DuckieParticleCluster>();
     }
     _particleClusters.Add(particleCluster);
     particleCluster.ParticleManager = this;
 }
 public void AddParticleCluster(DuckieParticleCluster particleCluster)
 {
     _particleClusters.Add(particleCluster);
     particleCluster.ParticleManager = this;
 }