说明

       最近美术同事在整理模型动画时有一个需求，就是选中部分的模型一件将材质替换成同一个材质球。在编辑器下将这个功能实现了出来。代码放在最后，简单记录一下。

思路

1. 首先对选中进行遍历，拿到所有的子对象；
2. 对每个具体的对象拿到对应的Mesh Renderer组件；
3. 对每个MeshRender组件中的Materials进行判断，判断是否有材质，材质是否有多个的情况；
4. 在替换成功后支持回退的功能；

效果

       这里是在Transform组件中调出对应的方法，因为有可能选中的物体没有MeshRenderer组件。支持选中多个物体。

代码

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


public class HK_ReplaceMaterial : Editor
{
    
    
    [MenuItem("CONTEXT/Transform/ReplaceMaterial")]
    static void MaterialReplacing()
    {
    
    
        MaterialReplacingEditorPanel.ShowReplaceMaterials();
    }
}

public class MaterialReplacingEditorPanel : EditorWindow
{
    
       
    //要替换的材质
    Material _material;
   
    public static void ShowReplaceMaterials()
    {
    
    
        EditorWindow ReplaceMaterialsWindow = GetWindow<MaterialReplacingEditorPanel>("ReplaceMaterials");
        ReplaceMaterialsWindow.Show();
    }

    private void OnGUI()
    {
    
    
        GUILayout.Space(10);

        GUILayout.BeginHorizontal();
        GUILayout.Label("材质替换", GUILayout.Width(100f));
        _material = EditorGUILayout.ObjectField(_material, typeof(Material), true) as Material;
        GUILayout.EndHorizontal();

        GUILayout.Space(10);

        if (GUILayout.Button("替换"))
        {
    
    
            var selectionObjs = Selection.gameObjects;

            if (_material == null)
            {
    
    
                EditorUtility.DisplayDialog("提醒", string.Format("当前没有选择任何材质"), "确定");
            }
            else if (selectionObjs.Length == 0)
            {
    
    
                EditorUtility.DisplayDialog("提醒", string.Format("当前没有选中物体"), "确定");
        }
            else if (EditorUtility.DisplayDialog("提醒", string.Format("是否将当前选中的物体全部替换材质？", _material.name), "确定", "取消"))
            {
    
    
                for (int i = 0; i < selectionObjs.Length; i++)
                {
    
    
                    TraverseChild(selectionObjs[i]);
                }
            }
        }
    }

    void TraverseChild(GameObject thisObject)
    {
    
    
        //回退
        List<Object> obj = new List<Object>();

        for (int i = 0; i < thisObject.GetComponentsInChildren<Renderer>(true).Length; i++)
        {
    
    
            if (thisObject == null)
                continue;

            else if (thisObject.GetComponentsInChildren<Renderer>(true)[i] == null)
                continue;
            else if (thisObject.GetComponentsInChildren<Renderer>(true)[i].sharedMaterial == null)
                continue;

            obj.Add(thisObject.GetComponentsInChildren<Renderer>(true)[i]);
        }

        Undo.RecordObjects(obj.ToArray(), "ds");

        for (int i = 0; i < thisObject.GetComponentsInChildren<Renderer>(true).Length; i++)
        {
    
    
            if (thisObject == null)
                continue;
            else if (thisObject.GetComponentsInChildren<Renderer>(true)[i] == null)
                continue;
            
            else if (thisObject.GetComponentsInChildren<Renderer>(true)[i].sharedMaterial == null)
                continue;
            
            List<Material> materials = new List<Material>();

            foreach (var j in thisObject.GetComponentsInChildren<Renderer>(true)[i].sharedMaterials)
            {
    
    
                materials.Add(_material);
            }

            thisObject.GetComponentsInChildren<Renderer>(true)[i].sharedMaterials = materials.ToArray();
        }
    }
}