Fixed emission material properties not being animable (#4366)

* Fixed emission material properties not being animable

* Updated changelog

Co-authored-by: sebastienlagarde <sebastien@unity3d.com>

Author: alelievr

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

@@ -170,6 +170,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed ray traced reflections that were too dark for unlit materials. Reflections are now more consistent with the material emissiveness.
 - Fixed pyramid color being incorrect when hardware dynamic resolution is enabled.
 - Fixed SSR Accumulation with Offset with Viewport Rect Offset on Camera
+- Fixed material Emission properties not begin animated when recording an animation (case 1328108).
 
 ### Changed
 - Changed Window/Render Pipeline/HD Render Pipeline Wizard to Window/Rendering/HDRP Wizard

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

@@ -116,6 +116,9 @@ internal static void UpdateEmissiveColorFromIntensityAndEmissiveColorLDR(Materia
             materialEditor.serializedObject.Update();
         }
 
+        internal static void UpdateEmissiveColorFromIntensityAndEmissiveColorLDR(MaterialProperty emissiveColorLDR, MaterialProperty emissiveIntensity, MaterialProperty emissiveColor)
+            => emissiveColor.colorValue = emissiveColorLDR.colorValue.linear * emissiveIntensity.floatValue;
+
         internal static void UpdateEmissiveColorLDRFromIntensityAndEmissiveColor(MaterialEditor materialEditor, Material[] materials)
         {
             materialEditor.serializedObject.ApplyModifiedProperties();
@@ -126,6 +129,12 @@ internal static void UpdateEmissiveColorLDRFromIntensityAndEmissiveColor(Materia
             materialEditor.serializedObject.Update();
         }
 
+        internal static void UpdateEmissiveColorLDRFromIntensityAndEmissiveColor(MaterialProperty emissiveColorLDR, MaterialProperty emissiveIntensity, MaterialProperty emissiveColor)
+        {
+            Color emissiveColorLDRLinear = emissiveColorLDR.colorValue / emissiveIntensity.floatValue;
+            emissiveColorLDR.colorValue = emissiveColorLDRLinear.gamma;
+        }
+
         internal static void DoEmissiveIntensityGUI(MaterialEditor materialEditor, MaterialProperty emissiveIntensity, MaterialProperty emissiveIntensityUnit)
         {
             bool unitIsMixed = emissiveIntensityUnit.hasMixedValue;
@@ -186,13 +195,13 @@ protected override void OnGUIOpen()
             else
             {
                 if (updateEmissiveColor)
-                    UpdateEmissiveColorLDRFromIntensityAndEmissiveColor(materialEditor, materials);
+                    UpdateEmissiveColorLDRFromIntensityAndEmissiveColor(emissiveColorLDR, emissiveIntensity, emissiveColor);
 
                 EditorGUI.BeginChangeCheck();
                 DoEmissiveTextureProperty(emissiveColorLDR);
                 DoEmissiveIntensityGUI(materialEditor, emissiveIntensity, emissiveIntensityUnit);
                 if (EditorGUI.EndChangeCheck())
-                    UpdateEmissiveColorFromIntensityAndEmissiveColorLDR(materialEditor, materials);
+                    UpdateEmissiveColorFromIntensityAndEmissiveColorLDR(emissiveColorLDR, emissiveIntensity, emissiveColor);
             }
 
             materialEditor.ShaderProperty(emissiveExposureWeight, Styles.emissiveExposureWeightText);