AB包，shader问题修复

Assets/Shaders/ShaderExtension.cs

@@ -0,0 +1,28 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public static class ShaderExtension
+{
+    /// <summary>
+    /// 对于从AssetBundle中加载的材质，修改Shader参数可能会出现异常情况。
+    /// 此时需要在生成物体的时候，重新初始化Shader。
+    /// </summary>
+    public static void InitializeShader(this Renderer renderer)
+    {
+        foreach (Material material in renderer.materials)
+        {
+            string shaderName = material.shader.name;
+            Shader shader = Shader.Find(shaderName);
+            
+            if (shader != null)
+            {
+                material.shader = shader;
+            }
+            else
+            {
+                Debug.LogWarning($"Shader '{shaderName}' not found for material '{material.name}' on renderer '{renderer.name}'.");
+            }
+        }
+    }
+}