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Question by TIGGYsmalls · Oct 17, 2013 at 09:39 AM · transparencyalphaskyboxes

Why does this Shader become hidden behind a skybox?

The shader below makes my objects disappear when I turn my sky box on. I guess it's got something to do with the Blend:

http://docs.unity3d.com/Documentation/Components/SL-Blend.html

But when I use anything other than "Blend SrcAlpha OneMinusSrcAlpha" it changes the effect I want.

I just want a self Illum shader with a separate alpha channel, is this the best way of doing it or does anyone else have a better, simple shader?

 Shader "WormHoleShader2" {
 
     Properties {
         
         _MainTex ("Base (RGB)", 2D) = "white" {}
         _AlphaTex ("Trans. (Alpha)", 2D) = "white" {}
 
     }
     
     SubShader {
         ZWrite Off
         Lighting On
         Blend SrcAlpha OneMinusSrcAlpha
         
         
         Pass {
                 SetTexture [_MainTex] {Combine texture} 
                 SetTexture [_AlphaTex] {Combine previous, texture} 
             }
 
     }
 
 }
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Answer by sethuraj · Oct 17, 2013 at 06:26 PM

Your sky-box is drawing in front of your mesh that's why it disappears. You need to turn On depth writing and turn of culling to draw both sides of the polygons.(If u know,ignore this - Your second texture '_AlphaTex' should have an alpha channel.It wont mask from RGB even if its only has Black n white)

Try this code (no tested properly)

 Shader "WormHoleShader2" 
 {
  
     Properties {
  
         _MainTex ("Base (RGB)", 2D) = "white" {}
         _AlphaTex ("Trans. (Alpha)", 2D) = "white" {}
  
     }
  
     SubShader 
     {
         Tags
         {
             "Queue"="Transparent"
             "RenderType"="Transparent"
         }
         
         Cull Off
         ZWrite On
         Lighting Off
         Blend SrcAlpha OneMinusSrcAlpha
  
  
         Pass 
         {
           SetTexture [_MainTex] {Combine texture} 
           SetTexture [_AlphaTex] {Combine previous, texture} 
             
          } 
     }
     
 }

Hope this helps ...!!!

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