unity 实现3d模型渐隐（修改材质透明度）_unity房屋渐隐

前言：看到此功能首先想到的是写shader，但是我对shader一知半解。网上找了几个大佬分享的做渐隐的shader也只是能实现渐隐而已，无法实现unity模型材质Standard的各种效果，我又不会修改Standard shader，所以只能退而求其次。

如有大佬明白如何用shader实现，烦请告知，感激不尽

下面说下我的实现方式：

由于模型材质Rendering Mode大都是Opaque，无法实现渐隐。

关于Rendering Mode，这里不做解释，不懂得转这里渲染模式 (Rendering Mode) - Unity 手册

实现思路：因为模型材质Rendering Mode模式不一样，所以要在做渐隐之前先将模型参数存起来，以便模型渐隐后可以复原。

模型参数存储很简单，我是用的字典。但是获取材质Rendering Mode以及修改材质Rendering Mode就比较冷门了。下面挂上代码实现方式

获取材质Rendering Mode：

// 获取材质的Rendering Mode
    public RenderingFadeMode GetMaterialRenderingFadeMode(Material material)
    {
        RenderingFadeMode rm = RenderingFadeMode.Opaque;
 
        int one = material.GetInt("_SrcBlend");
        int two = material.GetInt("_DstBlend");
        int three = material.GetInt("_ZWrite");
        bool oneKeyword = material.IsKeywordEnabled("_ALPHATEST_ON");
        bool twoKeyword = material.IsKeywordEnabled("_ALPHABLEND_ON");
        bool threeKeyword = material.IsKeywordEnabled("_ALPHAPREMULTIPLY_ON");
 
        if (one == 1 & two == 0 && three == 1 && oneKeyword == false && twoKeyword == false && threeKeyword == false)
            rm = RenderingFadeMode.Opaque;
        else if (one == 1 & two == 0 && three == 1 && oneKeyword == true && twoKeyword == false && threeKeyword == false)
            rm = RenderingFadeMode.Cutout;
        else if (one == 5 & two == 10 && three == 0 && oneKeyword == false && twoKeyword == true && threeKeyword == false)
            rm = RenderingFadeMode.Fade;
        else if (one == 1 & two == 10 && three == 0 && oneKeyword == false && twoKeyword == false && threeKeyword == true)
            rm = RenderingFadeMode.Transparent;
 
        return rm;
    }

修改材质Rendering Mode：

// 设置材质的Rendering Mode
    public void SetMaterialRenderingFadeMode(Material material, RenderingFadeMode RenderingFadeMode)
    {
        switch (RenderingFadeMode)
        {
            case RenderingFadeMode.Opaque:
                material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
                material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
                material.SetInt("_ZWrite", 1);
                material.DisableKeyword("_ALPHATEST_ON");
                material.DisableKeyword("_ALPHABLEND_ON");
                material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                material.renderQueue = -1;
                break;
            case RenderingFadeMode.Cutout:
                material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
                material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
                material.SetInt("_ZWrite", 1);
                material.EnableKeyword("_ALPHATEST_ON");
                material.DisableKeyword("_ALPHABLEND_ON");
                material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                material.renderQueue = 2450;
                break;
            case RenderingFadeMode.Fade:
                material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);
                material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
                material.SetInt("_ZWrite", 0);
                material.DisableKeyword("_ALPHATEST_ON");
                material.EnableKeyword("_ALPHABLEND_ON");
                material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                material.renderQueue = 3000;
                break;
            case RenderingFadeMode.Transparent:
                material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
                material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
                material.SetInt("_ZWrite", 0);
                material.DisableKeyword("_ALPHATEST_ON");
                material.DisableKeyword("_ALPHABLEND_ON");
                material.EnableKeyword("_ALPHAPREMULTIPLY_ON");
                material.renderQueue = 3000;
                break;
        }
    }

以上实现我也是第一次做，网上查了很久

各位同仁如有更好实现方式，烦请告知

项目工程在此，需要自取

链接：https://pan.baidu.com/s/1JYDG6DdS38rf6P4gGK28Bg 
提取码：84z7