ParticleSystemとスクリプトで星空的なものを作る

5000個パーティクル作り、パーティクルは静止させている。

using UnityEngine;
using System.Collections;

public class ParticleTest : MonoBehaviour
{

    // Use this for initialization
    void Start ()
    {
        ParticleSystem particleSystem = GetComponent<ParticleSystem> ();

        int num = 5000;

        particleSystem.Emit (num);
        ParticleSystem.Particle[] particle = new ParticleSystem.Particle[num];
        particleSystem.GetParticles(particle);
        particleSystem.Pause();
        for (var i = 0; i < num; i++)
        {
            particle [i].position = new Vector3 (
                (Random.value-0.5f)*100f,
                (Random.value-0.5f)*100f,
                (Random.value-0.5f)*100f
            );
        }

        particleSystem.SetParticles(particle,num);
    }

}