HDRenderPipeline: Another set of fix for update material script + expose Horizon Fade to layered material

Assets/ScriptableRenderPipeline/HDRenderPipeline/Editor/HDRenderPipelineMenuItems.cs

                 if (mat.shader.name == "HDRenderPipeline/LayeredLit" || mat.shader.name == "HDRenderPipeline/LayeredLitTessellation")
                 {
                     LayeredLitGUI.SynchronizeAllLayers(mat);
+                    EditorUtility.SetDirty(mat);
                 }
             }
         }
                         // We remove all keyword already present
                         RemoveMaterialKeywords(mat);
                         LayeredLitGUI.SetupMaterialKeywordsAndPass(mat);
+                        EditorUtility.SetDirty(mat);
                     }
                     else if (mat.shader.name == "HDRenderPipeline/Lit" || mat.shader.name == "HDRenderPipeline/LitTessellation")
                     {
+                        EditorUtility.SetDirty(mat);
                     }
                     else if (mat.shader.name == "HDRenderPipeline/Unlit")
                     {
-                    }
-
-                    EditorUtility.SetDirty(mat);
+                        EditorUtility.SetDirty(mat);
+                    }                    
                 }
             }
             finally

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/Editor/LayeredLitUI.cs

 
         protected override void FindMaterialProperties(MaterialProperty[] props)
         {
+            // Inherit from LitUI
+            horizonFade = FindProperty(kHorizonFade, props);
+
             layerCount = FindProperty(kLayerCount, props);
             layerMaskMap = FindProperty(kLayerMaskMap, props);
             vertexColorMode = FindProperty(kVertexColorMode, props);
 
             Material[] layers = null;
             InitializeMaterialLayers(materialImporter, ref layers);
-            for (int i = 0 ; i < layerCount ; ++i)
+
+            // We could have no userData in the assets, so test if we have load something
+            if (layers != null)
-                SynchronizeLayerProperties(material, layers, i);
+                for (int i = 0; i < layerCount; ++i)
+                {
+                    SynchronizeLayerProperties(material, layers, i);
+                }
             }
         }
 
                 useHeightBasedBlend.floatValue = enabled ? 1.0f : 0.0f;
             }
 
-            m_MaterialEditor.ShaderProperty(objectScaleAffectTile, mainLayerModeInfluenceEnable ? styles.objectScaleAffectTileText2 : styles.objectScaleAffectTileText);            
+            m_MaterialEditor.ShaderProperty(objectScaleAffectTile, mainLayerModeInfluenceEnable ? styles.objectScaleAffectTileText2 : styles.objectScaleAffectTileText);
+
+            m_MaterialEditor.ShaderProperty(horizonFade, Styles.horizonFadeText);
 
             EditorGUILayout.Space();
 

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Editor/LitUI.cs

         protected MaterialProperty specularOcclusionMap = null;
         protected const string kSpecularOcclusionMap = "_SpecularOcclusionMap";
         protected MaterialProperty horizonFade = null;
-        const string kHorizonFade = "_HorizonFade";
+        protected const string kHorizonFade = "_HorizonFade";
         protected MaterialProperty normalMap = null;
         protected const string kNormalMap = "_NormalMap";
         protected MaterialProperty normalScale = null;