HDRP - Clarified LayeredLit UI & doc

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -23,6 +23,7 @@ The version number for this package has increased due to a version update of a r
 - Fixed a migration issue with the rendering queue in ShaderGraph when upgrading to 10.x;
 - Fixed upside down XR occlusion mesh.
 - Fixed precision issue with the atmospheric fog.
+- Claryfied doc for the LayeredLit material.
 
 ### Changed
 - Combined occlusion meshes into one to reduce draw calls and state changes with XR single-pass.

com.unity.render-pipelines.high-definition/Documentation~/Layered-Lit-Shader.md

@@ -51,17 +51,22 @@ To create a new Layered Lit Material, navigate to your Project's Asset window, r
 | **Height Transition**                        | Use the slider to set the transition blend size between the Materials in each layer. |
 | **Lock Layers 123 Tiling With Object Scale** | Enable the checkbox to multiply the Material's tiling rate by the scale of the GameObject. This keeps the appearance of the heightmap consistent when you scale the GameObject. |
 
-### Material To Copy
+### Layer List
 
 This section contains a list of the Materials that this Layered Material uses as layers. To assign a Material to a layer, either drag and drop a Material into the property field for that layer, or:
 
 1. Click the radio button on the right of the layer to open the **Select Material** window.
 2. Find the Material you want from the list of Materials in the window and double-click it.
 
-To synchronize the properties between a referenced Material and the Layered Material, press the **Synchronize** button. This copies all of the properties from the referenced Material into the relevant Layered Material layer.
+If you modify the referenced Material in any way, you can synchronize the properties by pressing the **Reset button**. This copies all of the properties from the referenced Material into the relevant Layered Material layer.
 
 ![](Images/LayeredLit1.png)
 
+If you assign a Material made from a Shader Graph as a **Layer Material**, make sure the Reference of the properties matches the name of the corresponding properties in the LayeredLit Material.
+For an example of what this means, see **_BaseColorMap** in the screenshot below:
+
+![](Images/LayeredLit2.png)
+
 ### Layers
 
 Unity exposes up to four Material layers for you to use in your Layered Material. Use the **Layer Count** slider to set the number of layers that Unity exposes. Every layer shares the same **Surface Inputs** and **Detail Inputs**. The only difference is between the **Main Layer** and the numbered layers (**Layer 1**, **Layer 2**, and **Layer 3**) which have separate **Layering Options**.

com.unity.render-pipelines.high-definition/Editor/Material/UIBlocks/LayerListUIBlock.cs

@@ -179,6 +179,13 @@ void DrawLayerListGUI()
                     resetRect.width = 50;
                     EditorGUI.LabelField(resetRect, Styles.resetButtonIcon);
                 }
+
+                if (m_MaterialLayers[layerIndex] != null && m_MaterialLayers[layerIndex].shader != null)
+                {
+                    var shaderName = m_MaterialLayers[layerIndex].shader.name;
+                    if (shaderName != "HDRP/Lit" && shaderName != "HDRP/LitTessellation")
+                        EditorGUILayout.HelpBox("Selected material is not an HDRP Lit Material. Some properties may not be correctly imported.", MessageType.Info);
+                }
             }
 
             EditorGUIUtility.labelWidth = oldLabelWidth;