HDRenderPipeline: PRovide correct default value for Amplitude property of displacement

ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLit.shader

         _HeightMap2("HeightMap2", 2D) = "black" {}
         _HeightMap3("HeightMap3", 2D) = "black" {}
 
-        [HideInInspector] _HeightAmplitude0("Height Scale0", Float) = 1
-        [HideInInspector] _HeightAmplitude1("Height Scale1", Float) = 1
-        [HideInInspector] _HeightAmplitude2("Height Scale2", Float) = 1
-        [HideInInspector] _HeightAmplitude3("Height Scale3", Float) = 1
+        // Caution: Default value of _HeightAmplitude must be (_HeightMax - _HeightMin) * 0.01
+        [HideInInspector] _HeightAmplitude0("Height Scale0", Float) = 0.02
+        [HideInInspector] _HeightAmplitude1("Height Scale1", Float) = 0.02
+        [HideInInspector] _HeightAmplitude2("Height Scale2", Float) = 0.02
+        [HideInInspector] _HeightAmplitude3("Height Scale3", Float) = 0.02
 
         _HeightCenter0("Height Bias0", Range(0.0, 1.0)) = 0.5
         _HeightCenter1("Height Bias1", Range(0.0, 1.0)) = 0.5

ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLitTessellation.shader

         _HeightMap2("HeightMap2", 2D) = "black" {}
         _HeightMap3("HeightMap3", 2D) = "black" {}
 
-        [HideInInspector] _HeightAmplitude0("Height Scale0", Float) = 1
-        [HideInInspector] _HeightAmplitude1("Height Scale1", Float) = 1
-        [HideInInspector] _HeightAmplitude2("Height Scale2", Float) = 1
-        [HideInInspector] _HeightAmplitude3("Height Scale3", Float) = 1
+        // Caution: Default value of _HeightAmplitude must be (_HeightMax - _HeightMin) * 0.01
+        [HideInInspector] _HeightAmplitude0("Height Scale0", Float) = 0.02
+        [HideInInspector] _HeightAmplitude1("Height Scale1", Float) = 0.02
+        [HideInInspector] _HeightAmplitude2("Height Scale2", Float) = 0.02
+        [HideInInspector] _HeightAmplitude3("Height Scale3", Float) = 0.02
 
         _HeightCenter0("Height Bias0", Range(0.0, 1.0)) = 0.5
         _HeightCenter1("Height Bias1", Range(0.0, 1.0)) = 0.5

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

                 m_MaterialEditor.TexturePropertySingleLine(Styles.bentNormalMapOSText, bentNormalMapOS[layerIndex]);
             }
 
+            EditorGUI.BeginChangeCheck();
-                EditorGUI.BeginChangeCheck();
-                if (EditorGUI.EndChangeCheck())
-                {
-                    heightAmplitude[layerIndex].floatValue = (heightMax[layerIndex].floatValue - heightMin[layerIndex].floatValue) * 0.01f; // Conversion centimeters to meters.
-                }
+            // Note: We should only enclose min/max property here for change detection. However heightAmplitude may not be correctly initialize if default value was not correct
+            // force a refresh when the user setup a heightmap, so we are sure it is correct
+            if (EditorGUI.EndChangeCheck())
+            {
+                heightAmplitude[layerIndex].floatValue = (heightMax[layerIndex].floatValue - heightMin[layerIndex].floatValue) * 0.01f; // Conversion centimeters to meters.
+            }
-            if(materialID != null)
+            if (materialID != null)
             {
             switch ((Lit.MaterialId)materialID.floatValue)
             {
             else
             {
                 m_MaterialEditor.ShaderProperty(UVDetail[layerIndex], Styles.UVDetailMappingText);
-            }            
+            }
 
             // Setup the UVSet for detail, if planar/triplanar is use for base, it will override the mapping of detail (See shader code)
             X = ((UVDetailMapping)UVDetail[layerIndex].floatValue == UVDetailMapping.UV0) ? 1.0f : 0.0f;

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

         _BentNormalMapOS("_BentNormalMapOS", 2D) = "white" {}
 
         _HeightMap("HeightMap", 2D) = "black" {}
-        [HideInInspector] _HeightAmplitude("Height Amplitude", Float) = 0.01 // In world units. This will be computed in the UI.
+        // Caution: Default value of _HeightAmplitude must be (_HeightMax - _HeightMin) * 0.01
+        [HideInInspector] _HeightAmplitude("Height Amplitude", Float) = 0.02 // In world units. This will be computed in the UI.
         _HeightMin("Heightmap Min", Float) = -1
         _HeightMax("Heightmap Max", Float) = 1
         _HeightCenter("Height Center", Range(0.0, 1.0)) = 0.5 // In texture space

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.shader

         _BentNormalMapOS("_BentNormalMapOS", 2D) = "white" {}
 
         _HeightMap("HeightMap", 2D) = "black" {}
-        [HideInInspector] _HeightAmplitude("Height Amplitude", Float) = 0.01 // In world units
+        // Caution: Default value of _HeightAmplitude must be (_HeightMax - _HeightMin) * 0.01
+        [HideInInspector] _HeightAmplitude("Height Amplitude", Float) = 0.02 // In world units
         _HeightCenter("Height Center", Range(0.0, 1.0)) = 0.5 // In texture space
         _HeightMin("Heightmap Min", Float) = -1
         _HeightMax("Heightmap Max", Float) = 1