Fixed the engergy conservation problem when pbr mode is toon.

Editor/MeterialEditor/UIScopes/AdvanceScope.cs

@@ -10,6 +10,8 @@ namespace Misaki.HdrpToon.Editor
     {
         private static class Properties
         {
+            public static MaterialProperty diffuseMin;
+
             public static MaterialProperty lightIntensityMultiplier;
             public static MaterialProperty clampLightColor;
 
@@ -18,6 +20,8 @@ namespace Misaki.HdrpToon.Editor
 
         private static class Styles
         {
+            public static readonly GUIContent diffuseMinText = new("Minimal diffuse contribution", "Specifies the minimum contribution of the base color to the diffuse light. Keep it 0 to make sure energy conservation.");
+
             public static readonly GUIContent lightIntensityMultiplierText = new("Light Intensity Multiplier", "Specifies the intensity multiplier of the light.");
             public static readonly GUIContent clampLightColorText = new("Clamp Light Color", "Specifies whether to clamp the light color.");
 
@@ -30,6 +34,8 @@ namespace Misaki.HdrpToon.Editor
 
         public override void LoadMaterialProperties()
         {
+            Properties.diffuseMin = FindProperty(MINIMAL_DIFFUSE_CONTRIBUTION);
+
             Properties.lightIntensityMultiplier = FindProperty(LIGHT_INTENSITY_MULTIPLIER);
             Properties.clampLightColor = FindProperty(CLAMP_LIGHT_COLOR);
 
@@ -38,10 +44,12 @@ namespace Misaki.HdrpToon.Editor
 
         protected override void DrawContent()
         {
+            editor.ShaderProperty(Properties.diffuseMin, Styles.diffuseMinText);
+
             editor.ShaderProperty(Properties.lightIntensityMultiplier, Styles.lightIntensityMultiplierText);
             editor.ShaderProperty(Properties.clampLightColor, Styles.clampLightColorText);
 
             editor.ShaderProperty(Properties.lightLoopMode, Styles.lightLoopModeText);
         }
     }
-}
+}