偶然出来上がった産物

Gero.cs

using System.Collections;
using UnityEngine;

public class Gero : MonoBehaviour
{
    [SerializeField]
    private GameObject ball = default(GameObject);
    [SerializeField]
    private float speed = default(float);
    [SerializeField]
    private float geroSpeed = default(float);

    private class Param
    {
        internal int i;
        internal int add_deg;
    }

    private void Update()
    {
        if(Random.Range(0, 300) == 0)
        {
            int exp_num = Random.Range(30, 50);

            GameObject[] circle = new GameObject[exp_num];
            MoveBall[] moveBall = new MoveBall[exp_num];
            int add_deg = Random.Range(1, 360);

            for(int i = 0; i < exp_num; ++i)
            {
                Param param = new Param();
                param.i = i;
                param.add_deg = add_deg;
                circle[i] = Instantiate(ball, transform.position, Quaternion.identity) as GameObject;
                circle[i].AddComponent<TimeDestroy>().SetTime(Random.Range(1, 10));
                moveBall[i] = circle[i].GetComponent<MoveBall>();
                moveBall[i].StartMove(((tr, _param) =>
                {
                    Param p = (Param)_param;
                    float rad = Random.Range(0, 360) + (p.add_deg + 360 / exp_num * p.i) * Mathf.Deg2Rad;
                    tr.Translate(Mathf.Cos(rad) * Time.deltaTime * speed, Mathf.Sin(rad) * Time.deltaTime * speed - geroSpeed * Time.deltaTime, 0);
                }), (object)param);
            }
        }
    }
}