Unity处理材质球过期属性工具

 Unity中的材质属性被序列化以后，就会一直存储在资源中，即使该属性删除后，它的序列化值以及引用关系也不会被丢掉，所以我们经常会发现，当我们使用一个和之前命名相同的属性时，原来的属性值或资源就会被自动赋值，这是因为材质中一直保持这种关系；但是，有些时候我们为了优化或者其它需求，想要去清理掉这些引用关系，如下，给出了清理某个文件夹下所有材质过期属性的一个工具；

参考：游戏资源工具（一）：Unity中处理材质球过期属性工具

using UnityEngine;
using UnityEditor;

public class MatObseletePropertyWindow : EditorWindow
{
    public static string assetFolderPath = "Assets/Scenes";
    [MenuItem ("Tools/移除材质中的废弃属性")]
    public static void ShowWindow () {
        EditorWindow thisWindow = EditorWindow.GetWindow(typeof(MatObseletePropertyWindow));
        thisWindow.titleContent = new GUIContent("统计并移除材质中的无用属性");
        thisWindow.position = new Rect(Screen.width/2, Screen.height/2, 600, 1000);
    }

    public static void ClearMatObseleteProperty()
    {
        Debug.Log(Application.dataPath);
        string projectPath = Application.dataPath.Replace("Assets", "");
        assetFolderPath = assetFolderPath.Replace(projectPath, "");
        var matList = AssetDatabase.FindAssets("t:Material", new[] {assetFolderPath});
 
        foreach(var i in matList)
        {
            // EditorUtility.DisplayProgressBar("材质属性移除统计文件", "正在写入统计文件中...", ix/shaderList.Length);
            var path = AssetDatabase.GUIDToAssetPath(i);
            Material mat = AssetDatabase.LoadAssetAtPath(path, typeof(Material)) as Material;
            Debug.Log(mat.name);
            SerializedObject so = new SerializedObject(mat);
            SerializedProperty m_SavedProperties = so.FindProperty("m_SavedProperties");
            RemoveElement(mat, "m_TexEnvs", m_SavedProperties);
            RemoveElement(mat, "m_Floats", m_SavedProperties);
            RemoveElement(mat, "m_Colors", m_SavedProperties);
            so.ApplyModifiedProperties();
        }
        AssetDatabase.SaveAssets();
        AssetDatabase.Refresh();
    }
    private static void RemoveElement(Material mat, string spName, SerializedProperty saveProperty){
        SerializedProperty property = saveProperty.FindPropertyRelative(spName);
            for(int i = property.arraySize - 1; i >= 0; i--){
                var prop = property.GetArrayElementAtIndex(i);
                string propertyName = prop.displayName;
                if (!mat.HasProperty(propertyName))
                {
                    property.DeleteArrayElementAtIndex(i);
                    Debug.Log("移除属性名称" + propertyName);
                }
            }
    }
    void OnGUI()
    {
        EditorGUILayout.BeginHorizontal();
        EditorGUILayout.LabelField("选择文件夹");
        EditorGUILayout.TextField(assetFolderPath);
        if (GUILayout.Button("选择"))
        {
            assetFolderPath = EditorUtility.OpenFolderPanel("选择文件夹", assetFolderPath, "");
        }
        EditorGUILayout.EndHorizontal();
 
        if (GUILayout.Button("确定") && assetFolderPath != null)
        {
            ClearMatObseleteProperty();
        }
    }
}