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Assets/GameRes/Main/Shader/NiloOutlineUtil.hlsl

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+// For more information, visit -> https://github.com/ColinLeung-NiloCat/UnityURPToonLitShaderExample
+
+#ifndef Include_NiloOutlineUtil
+#define Include_NiloOutlineUtil
+
+// If your project has a faster way to get camera fov in shader, you can replace this slow function to your method.
+// For example, you write cmd.SetGlobalFloat("_CurrentCameraFOV",cameraFOV) using a new RendererFeature in C#.
+// For this tutorial shader, we will keep things simple and use this slower but convenient method to get camera fov
+float GetCameraFOV()
+{
+    //https://answers.unity.com/questions/770838/how-can-i-extract-the-fov-information-from-the-pro.html
+    float t = unity_CameraProjection._m11;
+    float Rad2Deg = 180 / 3.1415;
+    float fov = atan(1.0f / t) * 2.0 * Rad2Deg;
+    return fov;
+}
+float ApplyOutlineDistanceFadeOut(float inputMulFix)
+{
+    //make outline "fadeout" if character is too small in camera's view
+    return saturate(inputMulFix);
+}
+float GetOutlineCameraFovAndDistanceFixMultiplier(float positionVS_Z)
+{
+    float cameraMulFix;
+    if(unity_OrthoParams.w == 0)
+    {
+        ////////////////////////////////
+        // Perspective camera case
+        ////////////////////////////////
+
+        // keep outline similar width on screen accoss all camera distance       
+        cameraMulFix = abs(positionVS_Z);
+
+        // can replace to a tonemap function if a smooth stop is needed
+        cameraMulFix = ApplyOutlineDistanceFadeOut(cameraMulFix);
+
+        // keep outline similar width on screen accoss all camera fov
+        cameraMulFix *= GetCameraFOV();       
+    }
+    else
+    {
+        ////////////////////////////////
+        // Orthographic camera case
+        ////////////////////////////////
+        float orthoSize = abs(unity_OrthoParams.y);
+        orthoSize = ApplyOutlineDistanceFadeOut(orthoSize);
+        cameraMulFix = orthoSize * 50; // 50 is a magic number to match perspective camera's outline width
+    }
+
+    return cameraMulFix * 0.00005; // mul a const to make return result = default normal expand amount WS
+}
+#endif
+