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Question by Paradisebear · Aug 12, 2016 at 05:46 PM · shadershadersalphashader programmingshader writing

How can i add a alpha value to this shader?

I need the _MainTextue to have a alpha setting.

 Shader "ALTO/Additive Overlay Alpha" {
     Properties{
     _MainTex("Texture 1", 2D) = "white" {}
     _SecondaryTex("Texture 2", 2D) = "white" {}
     _SecondaryTexScale("Texture 2 Scale", Color) = (0,0,0,0)
     }
 
         Category{
 
         Tags{ "Queue" = "Overlay" }
 
         Blend SrcAlpha One
         Cull Back Lighting Off ZWrite Off Fog{ Mode Off }
         ZTest Always
 
         BindChannels{
         Bind "Color", color
         Bind "Vertex", vertex
         Bind "TexCoord", texcoord
     }
 
         SubShader{
         Tags{ "LightMode" = "Vertex" }
         Pass{
         SetTexture[_SecondaryTex]{
         constantColor[_SecondaryTexScale]
         combine texture * constant
     }
         SetTexture[_MainTex]{
         combine texture + previous
     }
         SetTexture[_MainTex]{
         combine previous * primary
     }
     }
     }
     }
 }
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Answer by Jessespike · Aug 12, 2016 at 07:38 PM

Start by adding an Alpha property at the top in properties:

 _Alpha ("Alpha", Range(0,1)) = 1

In the last/third SetTexture block, update the code to include Alpha

 SetTexture[_MainTex]{
     //combine previous * primary
     constantColor(1,1,1,[_Alpha])
     combine previous * constant
 }

I'm not sure what primary does and I don't know how to keep it with previous, I don't notice a difference without it, so maybe it's not needed. Sorry if I misinterpret your question, I know you asked how to change the alpha in only MainTexture and not everything, but I guessed that's you meant. If that's the case, then I'm not sure.

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avatar image Paradisebear · Aug 13, 2016 at 09:46 AM 0
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Thats perfect thank you!

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