Unity/Csharp/Particle

パーティクル再生

GameObject gameObj = GameObject.Find ("ParticleSystem1");
gameObj.GetComponent<ParticleSystem> ().Stop ();

パーティクル停止

GameObject gameObj = GameObject.Find("ParticleSystem1");
gameObj.GetComponent<ParticleSystem> ().Play ();

ホーミングレーザーを作る

追跡弾を２つ作ってみる例

1. UI/Particle Systemを新規で作る。
2. "Particle System"というのと"Particle System2"というのを作る。

public class HomingScene : MonoBehaviour
{
    ParticleSystem ps;
    ParticleSystem ps2;
    ParticleSystem.Particle[] m_Particles;
    public float threshold = 1f;
    public float intensity = 1f;
    public Transform target;

    public float _speed = 0.01f;    // 1秒間に進む距離
    public float _rotSpeed = 180.0f;  // 1秒間に回転する角度
    void Start()
    {
        ps = GameObject.Find("Particle System").GetComponent<ParticleSystem>();
        ps2 = GameObject.Find("Particle System2").GetComponent<ParticleSystem>();
        target = GameObject.Find("CircleSprite").transform;
    }
    void Update()
    {
        ViewParticle(ps);
        ViewParticle(ps2);
    }
    void ViewParticle(ParticleSystem ps)
    {
        m_Particles = new ParticleSystem.Particle[ps.main.maxParticles];
        int numParticlesAlive = ps.GetParticles(m_Particles);
        for (int i = 0; i < numParticlesAlive; i++)
        {
            var forward = ps.transform.TransformPoint(m_Particles[i].velocity);
            var position = ps.transform.TransformPoint(m_Particles[i].position);
            var direction = (target.TransformPoint(target.position) - position).normalized;
            var period = 1 - (m_Particles[i].remainingLifetime / m_Particles[i].startLifetime);
            m_Particles[i].velocity = ps.transform.InverseTransformPoint(forward + direction * period);
        }
        ps.SetParticles(m_Particles, numParticlesAlive);
    }
}

参考：https://qiita.com/Shinoda_Naoki/items/c6fbfc85fe24b2fcd5a1