ShaderLab

Структура ShaderLab

Shader "Name" { [Properties] SubShader{CGPROGRAM  Код на языке CG  
ENDCG} [Fallback] }

_MainTexture("MainTexture", 2D) = "white" {} 
_MainColor("MainColor",Color) = (1,1,1,1) 
_Atten("Atten",Range(0,1)) = 0.5 

SubShader 
{
   Tags{"Queue" = "Transparent"} 
      Pass  
          {
             CGPROGRAM 
             ENDCG
          }
}

Cull Off  
Zwrite On

Pass
{
...
AlphaTest Less 0.7 // рендерим только те пиксели, значение альфа у 
которых меньше 0.7 
 ... 
}

Shader "MyShaders/AlphaTest" 
{
  Properties 
{ 
 _Alpha("AlphaValue",Range(0,1)) = 0.6
}
  SubShader
 {
  Pass
   {
    AlphaTest Greater _Alpha // рендерим только те пиксели, значение 
альфа у которых больше _Alpha
    
    CGPROGRAM
    ... 
    ENDCG
   }
  }
}

Shader "MyShaders/AnotherShader" 
{
  Properties 
{ 
 _SomeVar('SomeVariable",Range(0,1)) = 0.5 
 _Tex("Texture",2D) = white{}
}
  SubShader
 {
  Pass
   {
    
    CGPROGRAM
    ... 
    uniform float _SomeVar; 
    uniform sampler2D _Tex; 
    ... 
    ENDCG
   }
  }
}

Shader "AlphaTest" 
{

  SubShader
 {
  Pass
   {
    
    CGPROGRAM
    ... 
    uniform float _SomeVar; 
    uniform sampler2D _Tex; 
    ... 
    ENDCG
   }
  }
Fallback "Diffuse" 
}