unity 透明视频输出实现方法

效果图：

unity 透明视频输出实现方法

1、shader:

Shader "Custom/NewSurfaceShader" {
   Properties{
       _Color("Color", Color) = (1,1,1,1)
       _MainTex("Albedo (RGB)", 2D) = "white" {}
       _Glossiness("Smoothness", Range(0,1)) = 0.5
       _Metallic("Metallic", Range(0,1)) = 0.0
           //原始代码保留
       _Num("Num",float) = 0.5 //方便调试的参数设置
   }
       SubShader{
           Tags { "Queue" = "Transparent" "RenderType" = "Transparent"}
           LOD 200

           CGPROGRAM
           // Physically based Standard lighting model, and enable shadows on all light types
           // surface surf Standard fullforwardshadows
           //#pragma surface surf NoLight vertex:vert alpha noforwardadd
           #pragma surface surf NoLighting alpha:auto
           // Use shader model 3.0 target, to get nicer looking lighting
           #pragma target 3.0

sampler2D _MainTex;

           struct Input {
               float2 uv_MainTex;
           };
           //添加
   //Alpha决定了贴图的透明度
           fixed4 LightingNoLighting(SurfaceOutput s, fixed3 lightDir, fixed atten)
           {
               fixed4 c;
               c.rgb = s.Albedo;
               c.a = s.Alpha;
               return c;
           }

           half _Glossiness;
           half _Metallic;
           fixed4 _Color;
           //别忘了声明一下_Num
           float _Num;

           // Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
           // See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
           // #pragma instancing_options assumeuniformscaling
           UNITY_INSTANCING_BUFFER_START(Props)
               // put more per-instance properties here
           UNITY_INSTANCING_BUFFER_END(Props)

void surf(Input IN, inout SurfaceOutput o) {
o.Emission = tex2D(_MainTex, IN.uv_MainTex).rgb;

               //这里给输出的Alpha赋值
               //由于我的视频没处理好，不是很对称。。。
               //对称的话应该是0.5
               //这里和0.43比较的是UV贴图的x轴的坐标（0~1,0.5就表示横坐标的一半）
               //右半边视频不显示，所以赋值alpha=0
               if (IN.uv_MainTex.y <= 0.5)
               {
                   o.Alpha = 0;
               }
               else
               {
                   //左半边视频的Alpha值和右半边黑白视频的RGB的值一样
                   //因为我这边处理的A黑白视频不是很好，所以获得了右半边UV的RGB后得比较一下
                   //再给Alpha赋值
                   o.Alpha = tex2D(_MainTex, float2(IN.uv_MainTex.x, IN.uv_MainTex.y - 0.5)).rgb * _Num;

}

           }
           ENDCG
       }
           FallBack "Diffuse"
}

视频地址：https://pan.baidu.com/s/1bneTfZGmICJAPz3ZJ05n7g

密码：vttk

unity 透明视频输出实现方法

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