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Unity2D精灵阴影问题

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using System;
using UnityEngine;
[RequireComponent(typeof(SpriteRenderer))]
public class SpriteShadow : MonoBehaviour{
    [HideInInspector]
	public Vector2 offset;
	public float offsetX;
	public float offsetY;
	private SpriteRenderer sprRndCaster;
	private SpriteRenderer sprRndShadow;
	private Transform transCaster;
	private Transform transShadow;
    [HideInInspector]
    public Material ShadowMaterial;
    [Tooltip("Order in Layer")]
    //public int sortingOrder;
    public int sortingOrderDifference;

    //public int sortingOrderDifference;
    //public bool updateSpriteOverTime = true;
    public bool updatePositionOverTime = true;
    private void Start(){
		this.offset = new Vector2(this.offsetX, this.offsetY);
		this.transCaster = this.transform;
		this.transShadow = new GameObject().transform;
		this.transShadow.parent = this.transCaster;
		this.transShadow.gameObject.name = "Shadow";
		this.transShadow.localRotation = Quaternion.identity;
		var vector = Vector3.one;
		var parent = this.transShadow;
		while (parent != null){
            //vector.Multiply(parent.localScale);  //  放大 x * x， y * y
            parent = parent.parent;
		}
		this.transShadow.localScale = vector;
		this.sprRndCaster = this.GetComponent<SpriteRenderer>();
        this.sprRndShadow = this.transShadow.gameObject.AddComponent<SpriteRenderer>();
        //this.sprRndShadow.material = this.ShadowMaterial;
        this.sprRndShadow.material = this.sprRndCaster.material;
        //HHLogger.DEBUG(this.ShadowMaterial, this.sprRndCaster.material);
        this.sprRndShadow.material.color = new Color(1,1,1,0.35f);
		//this.sprRndShadow.color = Color.white;
        this.sprRndShadow.color = Color.black;
        this.sprRndShadow.sortingLayerName = this.sprRndCaster.sortingLayerName;
        this.sprRndShadow.sortingOrder = this.sprRndCaster.sortingOrder + this.sortingOrderDifference - 1;
        this.transShadow.position = new Vector2(this.transCaster.position.x + this.offset.x, this.transCaster.position.y + this.offset.y);
        //this.transShadow.localPosition = new Vector3(this.offset.x, this.offset.y, 0);
        this.sprRndShadow.sprite = this.sprRndCaster.sprite;
        this.sprRndShadow.flipX = this.sprRndCaster.flipX;
    }

    private void LateUpdate()
    {
        //if (this.updateSpriteOverTime){
        //	this.sprRndShadow.sprite = this.sprRndCaster.sprite;
        //	this.sprRndShadow.flipX = this.sprRndCaster.flipX;
        //}
        if (this.updatePositionOverTime)
        {
            this.transShadow.position = new Vector2(this.transCaster.position.x + this.offset.x, this.transCaster.position.y + this.offset.y);
        }
    }
}