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Shader "Hidden/PiNode" { SubShader { Pass { CGPROGRAM #pragma vertex vert_img #pragma fragment frag #include "UnityCG.cginc" sampler2D _A; float4 frag(v2f_img i) : SV_Target { return tex2D( _A, i.uv ).r * UNITY_PI; } ENDCG } } }