From 20ebe3ac85ab991d9fdf3bfe0bb361e981aaf744 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Fri, 19 Aug 2022 15:35:34 +0200
Subject: [PATCH] Fix game ticking in editor during cut-scene rendering at edit
 time

---
 Source/Editor/Windows/Assets/SceneAnimationWindow.cs | 8 +++++++-
 Source/Engine/Level/Level.cpp                        | 7 ++++---
 Source/Engine/Level/Level.h                          | 6 +++++-
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/Source/Editor/Windows/Assets/SceneAnimationWindow.cs b/Source/Editor/Windows/Assets/SceneAnimationWindow.cs
index 0f4a3a535..aef74e8bd 100644
--- a/Source/Editor/Windows/Assets/SceneAnimationWindow.cs
+++ b/Source/Editor/Windows/Assets/SceneAnimationWindow.cs
@@ -276,7 +276,7 @@ namespace FlaxEditor.Windows.Assets
             private float _warmUpTimeLeft;
             private float _dt;
             private int _animationFrame;
-            private bool _wasGamePaused;
+            private bool _wasGamePaused, _wasTickEnabled;
             private SceneAnimationPlayer _player;
             private States _state;
             private readonly StagingTexture[] _stagingTextures = new StagingTexture[FrameLatency + 1];
@@ -365,11 +365,16 @@ namespace FlaxEditor.Windows.Assets
                 };
                 FlaxEngine.Scripting.Update += Tick;
                 _wasGamePaused = Time.GamePaused;
+                _wasTickEnabled = Level.TickEnabled;
                 Time.GamePaused = false;
                 Time.SetFixedDeltaTime(true, _dt);
                 Time.UpdateFPS = Time.DrawFPS = _options.FrameRate;
                 if (!Editor.IsPlayMode)
+                {
+                    // Don't simulate physics and don't tick game when rendering at edit time
                     Time.PhysicsFPS = 0;
+                    Level.TickEnabled = false;
+                }
                 Level.SpawnActor(_player);
                 var gameWin = editor.Windows.GameWin;
                 var resolution = _options.GetResolution();
@@ -441,6 +446,7 @@ namespace FlaxEditor.Windows.Assets
                 FlaxEngine.Scripting.Update -= Tick;
                 Time.SetFixedDeltaTime(false, 0.0f);
                 Time.GamePaused = _wasGamePaused;
+                Level.TickEnabled = _wasTickEnabled;
                 if (_player)
                 {
                     _player.Stop();
diff --git a/Source/Engine/Level/Level.cpp b/Source/Engine/Level/Level.cpp
index db7c52aab..98ad5a694 100644
--- a/Source/Engine/Level/Level.cpp
+++ b/Source/Engine/Level/Level.cpp
@@ -145,6 +145,7 @@ LevelService LevelServiceInstanceService;
 
 CriticalSection Level::ScenesLock;
 Array<Scene*> Level::Scenes;
+bool Level::TickEnabled = true;
 Delegate<Actor*> Level::ActorSpawned;
 Delegate<Actor*> Level::ActorDeleted;
 Delegate<Actor*, Actor*> Level::ActorParentChanged;
@@ -245,7 +246,7 @@ void LevelService::Update()
     auto& scenes = Level::Scenes;
 
     // Update all actors
-    if (!Time::GetGamePaused())
+    if (!Time::GetGamePaused() && Level::TickEnabled)
     {
         for (int32 i = 0; i < scenes.Count(); i++)
         {
@@ -274,7 +275,7 @@ void LevelService::LateUpdate()
     auto& scenes = Level::Scenes;
 
     // Update all actors
-    if (!Time::GetGamePaused())
+    if (!Time::GetGamePaused() && Level::TickEnabled)
     {
         for (int32 i = 0; i < scenes.Count(); i++)
         {
@@ -306,7 +307,7 @@ void LevelService::FixedUpdate()
     auto& scenes = Level::Scenes;
 
     // Update all actors
-    if (!Time::GetGamePaused())
+    if (!Time::GetGamePaused() && Level::TickEnabled)
     {
         for (int32 i = 0; i < scenes.Count(); i++)
         {
diff --git a/Source/Engine/Level/Level.h b/Source/Engine/Level/Level.h
index ae01cd572..5fc4c909b 100644
--- a/Source/Engine/Level/Level.h
+++ b/Source/Engine/Level/Level.h
@@ -43,6 +43,11 @@ public:
     /// </summary>
     API_FIELD(ReadOnly) static Array<Scene*> Scenes;
 
+    /// <summary>
+    /// True if game objects (actors and scripts) can receive a tick during engine Update/LateUpdate/FixedUpdate events. Can be used to temporarily disable gameplay logic updating.
+    /// </summary>
+    API_FIELD() static bool TickEnabled;
+
 public:
     /// <summary>
     /// Occurs when new actor gets spawned to the game.
@@ -104,7 +109,6 @@ public:
     /// <summary>
     /// Gets the scenes count.
     /// </summary>
-    /// <returns>The scenes count.</returns>
     API_PROPERTY() static int32 GetScenesCount()
     {
         return Scenes.Count();