Init

Assets/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_IsNaN.shader

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+Shader "Hidden/IsNaN"
+{
+	Properties
+	{
+		_A ("_A", 2D) = "white" {}
+	}
+	SubShader
+	{
+		Pass
+		{
+			CGPROGRAM
+			#include "UnityCG.cginc"
+			#include "Preview.cginc"
+			#pragma vertex vert_img
+			#pragma fragment frag
+
+			sampler2D _A;
+
+			bool4 IsNaN( float4 x )
+			{
+				const float zero = float4( 0.0f, 0.0f, 0.0f, 0.0f );
+				return !( x < zero || x > zero || x == zero );
+			}
+
+			float4 frag(v2f_img i) : SV_Target
+			{
+				// for some reason, isnan() wasn't working in preview shaders
+				return IsNaN( tex2D(_A, i.uv) ) ? 1 : 0;
+			}
+			ENDCG
+		}
+	}
+}