Unlit Shader with alpha mask

Question

I have a surface shader that has a main texture, and an alpha mask. (not just opacity value, but independent alpha mask that can be moved seperatly)

How can I get this to not interact with lights and be unlit?

 Shader "Custom/CanvasWithAlphaMask" {
     Properties {
        _MainTex("Base (RGB) Trans (A)", 2D) = "white" {}
        _Color ("Main Color", Color) = (0,0,0,0)
        _Stencil("Stencil Texture (RGB)", 2D) = "white" {}
     }
     Subshader {
        Tags {
          "Queue"="Transparent"
          "IgnoreProjector"="False"
          "RenderType"="Transparent"
        }

       Lighting Off //doesn't do anything

        CGPROGRAM
        #pragma surface surf Lambert alpha
          
          struct Input {
           float2 uv_MainTex;
          };
   
          half4 _Color;
          sampler2D _MainTex;
          sampler2D _Stencil;
          
            void surf (Input IN, inout SurfaceOutput o) {
             half4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
             o.Albedo = c.rgb;
                o.Alpha = c.a - tex2D(_Stencil, IN.uv_MainTex).a ;
         }
        ENDCG
     }
 }

Putting Lighting Off before CGPROGRAM didn't work , I thought it might be that simple.

Alternatively, if its easier, is there a way to use non-surface shader to achieve the same effect?

Answer 1

Best Answer

Answer by OP_toss · Apr 09, 2013 at 11:30 PM

Try this. Assign to emission instead of albedo. Albedo is for lighting.

instead of

 o.Albedo = c.rgb;

do

 o.Emission = c.rgb;

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Answer 2

Hope this help

 Shader "Custom/Unlit/Transparent" {
 
 Properties {
 
     _Color ("Main Color (A=Opacity)", Color) = (1,1,1,1)
 
     _MainTex ("Base (A=Opacity)", 2D) = ""
 
 }
 
  
 
 Category {
 
     Tags {"Queue"="Transparent" "IgnoreProjector"="True"}
 
     ZWrite Off
 
     Blend SrcAlpha OneMinusSrcAlpha 
 
  
 
     SubShader {Pass {
 
         GLSLPROGRAM
 
         varying mediump vec2 uv;
 
         
 
         #ifdef VERTEX
 
         uniform mediump vec4 _MainTex_ST;
 
         void main() {
 
             gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
 
             uv = gl_MultiTexCoord0.xy * _MainTex_ST.xy + _MainTex_ST.zw;
 
         }
 
         #endif
 
         
 
         #ifdef FRAGMENT
 
         uniform lowp sampler2D _MainTex;
 
         uniform lowp vec4 _Color;
 
         void main() {
 
             gl_FragColor = texture2D(_MainTex, uv) * _Color;
 
         }
 
         #endif      
 
         ENDGLSL
 
     }}
 
     
 
     SubShader {Pass {
 
         SetTexture[_MainTex] {Combine texture * constant ConstantColor[_Color]}
 
     }}
 
 }
 
  
 
 }

Unlit Shader with alpha mask

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