From 50ffdcd9ca8d47b4652dc4ba27f9fd9d65e86567 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Thu, 15 Jul 2021 13:50:50 +0200
Subject: [PATCH] Add `UpdateSpeed` to Animated Model for playback speed
 scaling

---
 Source/Engine/Animations/Animations.cpp      | 1 +
 Source/Engine/Level/Actors/AnimatedModel.cpp | 2 ++
 Source/Engine/Level/Actors/AnimatedModel.h   | 6 ++++++
 3 files changed, 9 insertions(+)

diff --git a/Source/Engine/Animations/Animations.cpp b/Source/Engine/Animations/Animations.cpp
index 033659948..359334da2 100644
--- a/Source/Engine/Animations/Animations.cpp
+++ b/Source/Engine/Animations/Animations.cpp
@@ -73,6 +73,7 @@ void AnimationsSystem::Job(int32 index)
         {
             dt = t - lastUpdateTime;
         }
+        dt *= animatedModel->UpdateSpeed;
         animatedModel->GraphInstance.LastUpdateTime = t;
 
         // Evaluate animated nodes pose
diff --git a/Source/Engine/Level/Actors/AnimatedModel.cpp b/Source/Engine/Level/Actors/AnimatedModel.cpp
index 3c41bdb9f..7b85d8e72 100644
--- a/Source/Engine/Level/Actors/AnimatedModel.cpp
+++ b/Source/Engine/Level/Actors/AnimatedModel.cpp
@@ -665,6 +665,7 @@ void AnimatedModel::Serialize(SerializeStream& stream, const void* otherObj)
     SERIALIZE(PerBoneMotionBlur);
     SERIALIZE(UseTimeScale);
     SERIALIZE(UpdateWhenOffscreen);
+    SERIALIZE(UpdateSpeed);
     SERIALIZE(UpdateMode);
     SERIALIZE(BoundsScale);
     SERIALIZE(CustomBounds);
@@ -688,6 +689,7 @@ void AnimatedModel::Deserialize(DeserializeStream& stream, ISerializeModifier* m
     DESERIALIZE(PerBoneMotionBlur);
     DESERIALIZE(UseTimeScale);
     DESERIALIZE(UpdateWhenOffscreen);
+    DESERIALIZE(UpdateSpeed);
     DESERIALIZE(UpdateMode);
     DESERIALIZE(BoundsScale);
     DESERIALIZE(CustomBounds);
diff --git a/Source/Engine/Level/Actors/AnimatedModel.h b/Source/Engine/Level/Actors/AnimatedModel.h
index 771833f2c..d584250b6 100644
--- a/Source/Engine/Level/Actors/AnimatedModel.h
+++ b/Source/Engine/Level/Actors/AnimatedModel.h
@@ -99,6 +99,12 @@ public:
     API_FIELD(Attributes="EditorOrder(40), DefaultValue(false), EditorDisplay(\"Skinned Model\")")
     bool UpdateWhenOffscreen = false;
 
+    /// <summary>
+    /// The animation update delta time scale. Can be used to speed up animation playback or create slow motion effect.
+    /// </summary>
+    API_FIELD(Attributes="EditorOrder(45), EditorDisplay(\"Skinned Model\")")
+    float UpdateSpeed = 1.0f;
+
     /// <summary>
     /// The animation update mode. Can be used to optimize the performance.
     /// </summary>