- Split shadow setting relevant to the scene from the HDRenderLoop ShadowSettings structure to the CommonSettings component.

- Made sure everything worked fine with multi-editing.

Assets/ScriptableRenderLoop/HDRenderLoop/Editor/HDRenderLoopInspector.cs

             public readonly GUIContent shadowsAtlasWidth = new GUIContent("Atlas width");
             public readonly GUIContent shadowsAtlasHeight = new GUIContent("Atlas height");
 
-            public readonly GUIContent shadowsMaxShadowDistance = new GUIContent("Maximum shadow distance");
-            public readonly GUIContent shadowsDirectionalLightCascadeCount = new GUIContent("Directional cascade count");
-            public readonly GUIContent[] shadowsCascadeCounts = new GUIContent[] { new GUIContent("1"), new GUIContent("2"), new GUIContent("3"), new GUIContent("4") };
-            public readonly int[] shadowsCascadeCountValues = new int[] { 1, 2, 3, 4 };
-            public readonly GUIContent shadowsCascades = new GUIContent("Cascade values");
-
             public readonly GUIContent tileLightLoopSettings = new GUIContent("Tile Light Loop Settings");
             public readonly string[] tileLightLoopDebugTileFlagStrings = new string[] { "Punctual Light", "Area Light", "Env Light"};
             public readonly GUIContent splitLightEvaluation = new GUIContent("Split light and reflection evaluation", "Toggle");
             shadowParameters.enabled = EditorGUILayout.Toggle(styles.shadowsEnabled, shadowParameters.enabled);
             shadowParameters.shadowAtlasWidth = Mathf.Max(0, EditorGUILayout.IntField(styles.shadowsAtlasWidth, shadowParameters.shadowAtlasWidth));
             shadowParameters.shadowAtlasHeight = Mathf.Max(0, EditorGUILayout.IntField(styles.shadowsAtlasHeight, shadowParameters.shadowAtlasHeight));
-            shadowParameters.maxShadowDistance = Mathf.Max(0, EditorGUILayout.FloatField(styles.shadowsMaxShadowDistance, shadowParameters.maxShadowDistance));
-            shadowParameters.directionalLightCascadeCount = EditorGUILayout.IntPopup(styles.shadowsDirectionalLightCascadeCount, shadowParameters.directionalLightCascadeCount, styles.shadowsCascadeCounts, styles.shadowsCascadeCountValues);
-            EditorGUI.indentLevel++;
-            for (int i = 0; i < shadowParameters.directionalLightCascadeCount - 1; i++)
-            {
-                shadowParameters.directionalLightCascades[i] = Mathf.Max(0, EditorGUILayout.FloatField(shadowParameters.directionalLightCascades[i]));
-            }
-            EditorGUI.indentLevel--;
             if (EditorGUI.EndChangeCheck())
             {
                 EditorUtility.SetDirty(renderLoop); // Repaint

Assets/ScriptableRenderLoop/HDRenderLoop/HDRenderLoop.cs

             public Matrix4x4 invViewProjectionMatrix;
         }
 
+        CommonSettings m_CommonSettings = null;
+        public CommonSettings commonSettings
+        {
+            set { m_CommonSettings = value; }
+            get { return m_CommonSettings; }
+        }
+
         public override void Build()
         {
 #if UNITY_EDITOR
             m_lightLoop.PushGlobalParams(hdCamera.camera, renderLoop);
         }
 
+        void UpdateCommonSettings()
+        {
+            if(m_CommonSettings == null)
+            {
+                m_ShadowSettings.maxShadowDistance = ShadowSettings.Default.maxShadowDistance;
+                m_ShadowSettings.directionalLightCascadeCount = ShadowSettings.Default.directionalLightCascadeCount;
+                m_ShadowSettings.directionalLightCascades = ShadowSettings.Default.directionalLightCascades;
+            }
+            else
+            {
+                m_ShadowSettings.directionalLightCascadeCount = m_CommonSettings.shadowCascadeCount;
+                m_ShadowSettings.directionalLightCascades = new Vector3(m_CommonSettings.shadowCascadeSplit0, m_CommonSettings.shadowCascadeSplit1, m_CommonSettings.shadowCascadeSplit2);
+                m_ShadowSettings.maxShadowDistance = m_CommonSettings.shadowMaxDistance;
+            }
+        }
+
         public override void Render(Camera[] cameras, RenderLoop renderLoop)
         {
             if (!m_LitRenderLoop.isInit)
 
             // Do anything we need to do upon a new frame.
             m_lightLoop.NewFrame();
+
+            UpdateCommonSettings();
 
             // Set Frame constant buffer
             // TODO...

Assets/ScriptableRenderLoop/HDRenderLoop/SceneSettings/CommonSettings.cs

     public class CommonSettings 
         : MonoBehaviour
     {
-        [SerializeField]
-        private string m_SkyRendererTypeName = "";
+        [SerializeField] private string     m_SkyRendererTypeName = ""; // Serialize a string because serialize a Type.
+
+        [SerializeField] float              m_ShadowMaxDistance = ShadowSettings.Default.maxShadowDistance;
+        [SerializeField] int                m_ShadowCascadeCount = ShadowSettings.Default.directionalLightCascadeCount;
+        [SerializeField] float              m_ShadowCascadeSplit0 = ShadowSettings.Default.directionalLightCascades.x;
+        [SerializeField] float              m_ShadowCascadeSplit1 = ShadowSettings.Default.directionalLightCascades.y;
+        [SerializeField] float              m_ShadowCascadeSplit2 = ShadowSettings.Default.directionalLightCascades.z;
+
         public Type skyRendererType
         {
             set { m_SkyRendererTypeName = value != null ? value.FullName : ""; OnSkyRendererChanged(); }
+        public float shadowMaxDistance { set { m_ShadowMaxDistance = value; OnValidate(); } get { return m_ShadowMaxDistance; } }
+        public int shadowCascadeCount { set { m_ShadowCascadeCount = value; OnValidate(); } get { return m_ShadowCascadeCount; } }
+        public float shadowCascadeSplit0 { set { m_ShadowCascadeSplit0 = value; OnValidate(); } get { return m_ShadowCascadeSplit0; } }
+        public float shadowCascadeSplit1 { set { m_ShadowCascadeSplit1 = value; OnValidate(); } get { return m_ShadowCascadeSplit1; } }
+        public float shadowCascadeSplit2 { set { m_ShadowCascadeSplit2 = value; OnValidate(); } get { return m_ShadowCascadeSplit2; } }
 
         void OnEnable()
         {
                 return;
             }
 
+            if (renderLoop.commonSettings == null)
+                renderLoop.commonSettings = this;
+            else if (renderLoop.commonSettings != this)
+                Debug.LogWarning("Only one CommonSettings can be setup at a time.");
+
+            HDRenderLoop renderLoop = Utilities.GetHDRenderLoop();
+            if (renderLoop == null)
+            {
+                return;
+            }
+
+            if (renderLoop.commonSettings == this)
+                renderLoop.commonSettings = null;
+        }
+
+        void OnValidate()
+        {
+            m_ShadowMaxDistance = Mathf.Max(0.0f, m_ShadowMaxDistance);
+            m_ShadowCascadeCount = Math.Min(4, Math.Max(1, m_ShadowCascadeCount));
+            m_ShadowCascadeSplit0 = Mathf.Min(1.0f, Mathf.Max(0.0f, m_ShadowCascadeSplit0));
+            m_ShadowCascadeSplit1 = Mathf.Min(1.0f, Mathf.Max(0.0f, m_ShadowCascadeSplit1));
+            m_ShadowCascadeSplit2 = Mathf.Min(1.0f, Mathf.Max(0.0f, m_ShadowCascadeSplit2));
         }
 
         void OnSkyRendererChanged()

Assets/ScriptableRenderLoop/HDRenderLoop/SceneSettings/Editor/CommonSettingsEditor.cs

 namespace UnityEngine.Experimental.ScriptableRenderLoop
 {
     [CustomEditor(typeof(CommonSettings))]
+    [CanEditMultipleObjects]
     public class CommonSettingsEditor
         : Editor
     {
+            public readonly GUIContent sky = new GUIContent("Sky");
+
+            public readonly GUIContent shadows = new GUIContent("Shadows");
+            public readonly GUIContent maxShadowDistance = new GUIContent("Maximum shadow distance");
+            public readonly GUIContent shadowsDirectionalLightCascadeCount = new GUIContent("Directional cascade count");
+            public readonly GUIContent[] shadowsCascadeCounts = new GUIContent[] { new GUIContent("1"), new GUIContent("2"), new GUIContent("3"), new GUIContent("4") };
+            public readonly int[] shadowsCascadeCountValues = new int[] { 1, 2, 3, 4 };
+            public readonly GUIContent shadowsCascades = new GUIContent("Cascade values");
+            public readonly GUIContent[] shadowSplits = new GUIContent[] { new GUIContent("Split 0"), new GUIContent("Split 1"), new GUIContent("Split 2") };
+
         }
 
         private static Styles s_Styles = null;
             }
         }
 
-        private List<Type> m_SkyRendererTypes;
+        // Sky renderer
+        List<Type> m_SkyRendererTypes = new List<Type>();
+        private List<string> m_SkyRendererFullTypeNames = new List<string>();
+        private bool multipleEditing { get { return targets.Length > 1; } }
+
+        private SerializedProperty m_SkyRenderer;
+
+        private SerializedProperty m_ShadowMaxDistance;
+        private SerializedProperty m_ShadowCascadeCount;
+        private SerializedProperty[] m_ShadowCascadeSplits = new SerializedProperty[3];
+
+            m_SkyRenderer = serializedObject.FindProperty("m_SkyRendererTypeName");
+
+            m_ShadowMaxDistance = serializedObject.FindProperty("m_ShadowMaxDistance");
+            m_ShadowCascadeCount = serializedObject.FindProperty("m_ShadowCascadeCount");
+            for (int i = 0; i < 3; ++i)
+                m_ShadowCascadeSplits[i] = serializedObject.FindProperty(string.Format("m_ShadowCascadeSplit{0}", i));
+
-                                .GetTypes()
-                                .Where(t => t.IsSubclassOf(typeof(SkyRenderer)) && !t.IsGenericType)
-                                .ToList();
+                                            .GetTypes()
+                                            .Where(t => t.IsSubclassOf(typeof(SkyRenderer)) && !t.IsGenericType)
+                                            .ToList();
+            m_SkyRendererFullTypeNames.Clear();
-            for(int i = 0 ; i < m_SkyRendererTypes.Count ; ++i)
+            for (int i = 0; i < m_SkyRendererTypes.Count; ++i)
+                m_SkyRendererFullTypeNames.Add(longName);
                 char[] separators = {'.'};
                 string[] tokens = longName.Split(separators);
                 m_SkyRendererTypeNames.Add(new GUIContent(tokens[tokens.Length - 1]));
             // Add default null value.
             m_SkyRendererTypeNames.Add(styles.none);
+            m_SkyRendererFullTypeNames.Add("");
-        public override void OnInspectorGUI()
+        void OnSkyInspectorGUI()
-            serializedObject.Update();
+            EditorGUILayout.LabelField(styles.sky);
+            EditorGUI.indentLevel++;
-            CommonSettings settings = target as CommonSettings;
-            // Retrieve the index of the current SkyRenderer
+            // Retrieve the index of the current SkyRenderer. Won't be used in case of multiple editing with different values
-            for(int i = 0 ; i < m_SkyRendererTypeValues.Count ; ++i )
+            for (int i = 0; i < m_SkyRendererTypeNames.Count; ++i)
-                if(m_SkyRendererTypes[i] == settings.skyRendererType)
+                if (m_SkyRendererFullTypeNames[i] == m_SkyRenderer.stringValue)
                 {
                     index = i;
                     break;
+            EditorGUI.showMixedValue = m_SkyRenderer.hasMultipleDifferentValues;
+            if (EditorGUI.EndChangeCheck())
+            {
+                m_SkyRenderer.stringValue = m_SkyRendererFullTypeNames[newValue];
+            }
+            EditorGUI.showMixedValue = false;
+
+            EditorGUI.indentLevel--;
+        }
+
+        void OnShadowInspectorGUI()
+        {
+            EditorGUILayout.LabelField(styles.shadows);
+            EditorGUI.indentLevel++;
+            EditorGUILayout.PropertyField(m_ShadowMaxDistance, styles.maxShadowDistance);
+
+            EditorGUI.BeginChangeCheck();
+            EditorGUI.showMixedValue = m_ShadowCascadeCount.hasMultipleDifferentValues;
+            int newCascadeCount = EditorGUILayout.IntPopup(styles.shadowsDirectionalLightCascadeCount, m_ShadowCascadeCount.intValue, styles.shadowsCascadeCounts, styles.shadowsCascadeCountValues);
-                settings.skyRendererType = m_SkyRendererTypes[newValue];
+                m_ShadowCascadeCount.intValue = newCascadeCount;
+            }
+
+            // Compute max cascade count.
+            int maxCascadeCount = 0;
+            for (int i = 0; i < targets.Length; ++i)
+            {
+                CommonSettings settings = targets[i] as CommonSettings;
+                maxCascadeCount = Math.Max(maxCascadeCount, settings.shadowCascadeCount);
+
+            EditorGUI.indentLevel++;
+            for (int i = 0; i < maxCascadeCount - 1; i++)
+            {
+                EditorGUILayout.PropertyField(m_ShadowCascadeSplits[i], styles.shadowSplits[i]);
+            }
+            EditorGUI.indentLevel--;
+            EditorGUI.indentLevel--;
+        }
+
+        public override void OnInspectorGUI()
+        {
+            serializedObject.Update();
+
+            OnSkyInspectorGUI();
+            OnShadowInspectorGUI();
 
             serializedObject.ApplyModifiedProperties();
         }