How to add alpha channel to this shader?

Questions & Answers
1

Shader “mShaders/Holes1” {
Properties {
__MainTex (“Color (RGB) Alpha (A)”, 2D) = “white”

  _SliceGuide ("Slice Guide (RGB)", 2D) = "white" {}
  _SliceAmount ("Slice Amount", Range(0.0, 1.0)) = 0.9
}
SubShader {
  Tags {"Queue"="Transparent" "RenderType"="Transparent" }
  Cull Off
  CGPROGRAM
  //if you're not planning on using shadows, remove "addshadow" for better performance
  #pragma surface surf Lambert 
  #pragma surface surf Lambert alpha
  //addshadow
  struct Input {
      float2 uv_MainTex;
      float2 uv_SliceGuide;
      float _SliceAmount;
  };
  sampler2D _MainTex;
  sampler2D _SliceGuide;
  float _SliceAmount;
  void surf (Input IN, inout SurfaceOutput o) {
      clip(tex2D (_SliceGuide, IN.uv_SliceGuide).rgb - _SliceAmount);
      o.Albedo = tex2D (_MainTex, IN.uv_MainTex).rgb;
      o.Alpha = tex2D (_MainTex, IN.uv_MainTex).a;
   
  }
  ENDCG
}
Fallback "Diffuse"

}

what I want to add is alpha ,but no luck.
any help?

2

The Alpha channel is just another channel in the texture. It’s often used for transparency but you aren’t forced to. If you want a source alpha transparency like most transparent shaders do, you need to specify a blend function. The most common one is:

    Blend SrcAlpha OneMinusSrcAlpha

Just put it after your Cull Off line