滚动的白云

public class ScrollBackground : MonoBehaviour {

public float scrollSpeed;
private Vector2 savedOffset;

void Start ()
{
    savedOffset = GetComponent<Renderer>().material.GetTextureOffset ("_MainTex");
}

void Update ()
{
    float x = Mathf.Repeat (Time.time * scrollSpeed, 1);
    Vector2 offset = new Vector2 (x , savedOffset.y);
    GetComponent<Renderer>().material.SetTextureOffset("_MainTex", offset);
}

}