Unity Editor 代码中创建Prefab时无法关联Material(Material丢失)问题

最新推荐文章于 2023-12-26 00:23:08 发布

A丶Knight

最新推荐文章于 2023-12-26 00:23:08 发布

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分类专栏： Unity学习笔记文章标签： unity editor prefab material

本文链接：https://blog.youkuaiyun.com/qq_28768929/article/details/106349549

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原实现如下：

private void createOne(string path)
    {
        StaticSkin skin = Utils.ReadSkins(path);
        Mesh mesh = Utils.BuildMeshBySkin(skin);

        string mp = meshPath + "/" + skin.name + ".asset";
        AssetDatabase.CreateAsset(mesh, mp);

        GameObject go = new GameObject(skin.name);
        MeshRenderer render = go.AddComponent<MeshRenderer>();
        render.sharedMaterials = new UnityEngine.Material[skin.Materials.Length];
        for (int i = 0; i < render.sharedMaterials.Length; ++i)
        {
            string materialName = skin.Materials[i].Texture;
            if (string.IsNullOrEmpty(materialName) == false)
            {
                Debug.Log("[" + materialName + "]");
                int idx = materialName.LastIndexOf('.');
                materialName = materialName.Substring(0, idx) + ".mat";
                UnityEngine.Material mat = AssetDatabase.LoadAssetAtPath<UnityEngine.Material>(materialPath + "/" + materialName);
                render.sharedMaterials[i] = mat;
            }
        }

        MeshFilter mf = go.GetComponent<MeshFilter>();
        if (mf == null)
            mf = go.AddComponent<MeshFilter>();
        mf.sharedMesh = mesh;

        PrefabUtility.SaveAsPrefabAsset(go, prefabPath + "/" + skin.name + ".prefab");
        DestroyImmediate(go);
    }

但是发现代码执行过后，Prefab中引用的Material全是none，模型显示默认颜色红色

里面关键一行的错误在

render.sharedMaterials[i] = mat;

这里Material数组需要一次性赋值，不能逐个赋值，所以代码改成这样：

private void createOne(string path)
    {
        StaticSkin skin = Utils.ReadSkins(path);
        Mesh mesh = Utils.BuildMeshBySkin(skin);

        string mp = meshPath + "/" + skin.name + ".asset";
        AssetDatabase.CreateAsset(mesh, mp);

        GameObject go = new GameObject(skin.name);
        MeshRenderer render = go.AddComponent<MeshRenderer>();
        UnityEngine.Material[] sharedMaterials = new UnityEngine.Material[skin.Materials.Length];
        for(int i = 0; i < sharedMaterials.Length; ++i)
        {
            string materialName = skin.Materials[i].Texture;
            if(string.IsNullOrEmpty(materialName) == false)
            {
                Debug.Log("[" + materialName + "]");
                int idx = materialName.LastIndexOf('.');
                materialName = materialName.Substring(0, idx) + ".mat";
                UnityEngine.Material mat = AssetDatabase.LoadAssetAtPath<UnityEngine.Material>(materialPath + "/" + materialName);
                sharedMaterials[i] = mat;
            }
        }

        render.sharedMaterials = sharedMaterials;

        MeshFilter mf = go.GetComponent<MeshFilter>();
        if(mf == null)
            mf = go.AddComponent<MeshFilter>();
        mf.sharedMesh = mesh;

        PrefabUtility.SaveAsPrefabAsset(go, prefabPath + "/" + skin.name + ".prefab");
        DestroyImmediate(go);
    }

这段代码中，单独创建了一个数组UnityEngine.Material[] sharedMaterials，然后为这个数组填充数据，最后一次性将数组传入 Renderer

render.sharedMaterials = sharedMaterials;

原因是这样：

sharedMaterials是个属性，也就是我们说的get/set，我们可以写如下伪代码

public class Renderer
{
    private Material[] shareMats;
    public Material[] sharedMaterials
    {
        get { retrun shareMats; }
        set
        {
            shareMats = value;
            // 做一些底层必要的操作
        }
    }
}

从这份伪代码中看到，如果我们使用renderer.sharedMaterials[i] = mat;

虽然把材质放进去了，但是实际上只执行了get方法，set方法却没有执行，注释所代表的的那些“”底层必要的操作“”自然无法执行，这就导致你设置进去的材质不生效

而使用rendere.sharedMaterials = mats;

则会执行set方法而不是get方法，这样，内部一些操作就会正常执行，所以材质就有效了。