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Question by mmj · Jun 06, 2013 at 05:56 AM · shaderlab

syntax error in while writing multipass surface shader

Please tell me why this shader is not valid. I get a syntax error pointing to line "#pragma surface surf Lambert". when i comment out that line the syntax error disappears but i don't get the correct output.

You can find the original shader at http://docs.unity3d.com/Documentation/Components/SL-SurfaceShaderExamples.html I only added a pass{} block.

   Shader "Example/Diffuse Simple" {
     SubShader 
     {
       Tags { "RenderType" = "Opaque" }
       
       pass
       {
           CGPROGRAM
           #pragma surface surf Lambert
           struct Input {
           float4 color : COLOR;
           };
           void surf (Input IN, inout SurfaceOutput o) {
           o.Albedo = 1;
           }
           ENDCG
       }
     }
     Fallback "Diffuse"
   }
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Answer by dustye1 · Jun 25, 2013 at 10:35 PM

Surface shaders cannot be located inside a pass block. You can have multiple surface shaders alongside multiple pass blocks, and everything should work fine, but as soon as you put a surface shader inside a pass block, it does not compile. See this thread for more info: http://forum.unity3d.com/threads/96393-Achieving-a-multi-pass-effect-with-a-Surface-Shader

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