スプライトアニメーションが使用するテクスチャを上書きする

OverrideSpriteAnimationsTexture.cs

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

[RequireComponent(typeof(SpriteRenderer))]
public class OverrideSprite : MonoBehaviour 
{
	private SpriteRenderer sr;

	private static int idMainTex = Shader.PropertyToID("_MainTex");
	private MaterialPropertyBlock block;

	[SerializeField] 
	private Texture texture = null;
	public Texture overrideTexture{
		get{ return texture; }
		set{
			texture = value; 
			if (block == null) {
				Init ();
			}
			block.SetTexture (idMainTex, texture);
		}
	}

	void Awake()
	{
		Init ();
		overrideTexture = texture;
	}

	void LateUpdate()
	{
		sr.SetPropertyBlock (block);
	}

	void OnValidate()
	{
		overrideTexture = texture;
	}

	void Init()
	{
		block = new MaterialPropertyBlock ();
		sr = GetComponent<SpriteRenderer> ();
		sr.GetPropertyBlock (block);
	}
}