steeplechase/unity/Assets/Scripts/Cloud.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Cloud : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        ReInit();
    }

    // Update is called once per frame
    void Update()
    {
        const float SPEED = 1f;
        this.transform.position = new Vector3(transform.position.x - SPEED, transform.position.y, transform.position.z);
    }

    public void ReInit()
    {
        float scale = Random.Range(1.5f, 2.5f);
        float x = Random.Range(-100f, 100f);
        float y = Random.Range(95f, 975f);
        transform.localScale = new Vector3(scale, scale, 2f);
        transform.position = new Vector3(transform.position.x + x, y, transform.position.z);
    }
}