Add default value for HDRP shadow data

ScriptableRenderPipeline/Core/CoreRP/Editor/CoreEditorUtils.cs

             material.shaderKeywords = null;
         }
 
-        public static T[] GetAdditionalData<T>(params UnityEngine.Object[] targets)
+        public static T[] GetAdditionalData<T>(UnityEngine.Object[] targets, Action<T> initDefault = null)
             where T : Component
         {
             // Handles multi-selection
             for (int i = 0; i < data.Length; i++)
             {
                 if (data[i] == null)
+                {
+                    if (initDefault != null)
+                    {
+                        initDefault(data[i]);
+                    }
+                }
             }
 
             return data;

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/HDRenderPipelineMenuItems.cs

                     light.gameObject.AddComponent<HDAdditionalLightData>();
 
                 if (light.GetComponent<AdditionalShadowData>() == null)
-                    light.gameObject.AddComponent<AdditionalShadowData>();
+                {
+                    AdditionalShadowData shadowData = light.gameObject.AddComponent<AdditionalShadowData>();
+                    HDAdditionalShadowData.InitDefaultHDAdditionalShadowData(shadowData);
+                }
             }
         }
 

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Lighting/HDLightEditor.cs

 
             // Get & automatically add additional HD data if not present
             var lightData = CoreEditorUtils.GetAdditionalData<HDAdditionalLightData>(targets);
-            var shadowData = CoreEditorUtils.GetAdditionalData<AdditionalShadowData>(targets);
+            var shadowData = CoreEditorUtils.GetAdditionalData<AdditionalShadowData>(targets, HDAdditionalShadowData.InitDefaultHDAdditionalShadowData);
             m_SerializedAdditionalLightData = new SerializedObject(lightData);
             m_SerializedAdditionalShadowData = new SerializedObject(shadowData);
 

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/Light/HDAdditionalShadowData.cs

+using UnityEngine.Experimental.Rendering;
+
+namespace UnityEditor.Experimental.Rendering.HDPipeline
+{
+    public class HDAdditionalShadowData
+    {
+        public static void InitDefaultHDAdditionalShadowData(AdditionalShadowData shadowData)
+        {
+            // Update bias control for HD
+
+            // bias control default value based on empirical experiment
+            shadowData.viewBiasMin          = 0.2f;
+            shadowData.viewBiasMax          = 10.0f;
+            shadowData.viewBiasScale        = 1.0f;
+            shadowData.nrmlBiasMin          = 0.5f;
+            shadowData.nrmlBiasMax          = 0.5f;
+            shadowData.nrmlBiasScale        = 1.0f;
+            shadowData.sampleBiasScale      = false;
+            shadowData.edgeLeakFixup        = true;
+            shadowData.edgeToleranceNrml    = true;
+            shadowData.edgeTolerance        = 1.0f;
+        }
+    }
+}

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/Light/HDAdditionalShadowData.cs.meta

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