Unlit Shader with alpha mask

Archived Forums Questions & Answers
1

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?

Just a thought, if lighting is applied in the vertex/fragment functions and the default functions apply lighting, it would explain why you are still getting lighting applied. Writing basic custom vertex/fragment functions would solve the problem if this is the case.

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Ok thanks, I will look into translating the surface shader part to a vertex/fragment setup

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In your subshader add the following: Lighting Off This will disable lighting without having to manually write a vertex and fragment shader. Hope this helps!

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Thanks @OP_toss, but that doesn't work for some reason. I read a similar question around here that had that as the answer, but no dice.

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2 Answers

2
2

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

instead of

o.Albedo = c.rgb;

do

o.Emission = c.rgb;
3

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]}

    }}

}

 

}