vault backup: 2024-05-17 18:03:12
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@ -9,6 +9,11 @@ rating: ⭐
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参考：
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1. [sequencer mute tracks at runtime from c](https://forums.unrealengine.com/t/sequencer-mute-tracks-at-runtime-from-c/476278/3)
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可行思路：
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1. 给导播创建一个快捷键（Hotkey），之后在触发根据Tag切换对应角色动画蓝图中的逻辑。
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2. 使用Sequence的EventTrack设置若干事件。
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3. 模改UMovieSceneSkeletalAnimationTrack，实现一个可以自动根据Tag捕获对应角色并且播发动画的功能。
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# 方案一
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- UMovieSceneTrack::SetEvalDisabled(bool)
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- ULevelSequence::MarkAsChanged()
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@ -52,9 +57,11 @@ UMovieSceneSequenceExtensions methods are not exported. They don’t have the PL
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- https://zhuanlan.zhihu.com/p/396353973
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- https://zhuanlan.zhihu.com/p/414179358
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- https://zhuanlan.zhihu.com/p/413151867
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- LevelSequence分析
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- https://zhuanlan.zhihu.com/p/157892605
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## 继承关系
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UMovieSceneSignedObject -> UObject
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UMovieSceneSignedObject -> UObject。一个UMovieScene由若干个MasterTrack(UMovieSceneTrack)组成，UMovieScene相当于是UMovieSceneTracks的容器，那么UMovieSceneTrack又由UMovieSceneSections组成，UMovieSceneSection就是一个Track中间的某一段。
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### UMovieSceneSignedObject
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子类有UMovieScene、UMovieSceneSequence、UMovieSceneTrack、UMovieSceneSection。
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@ -74,5 +81,266 @@ UMovieSceneSignedObject -> UObject
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编辑器代码：**FSkeletalAnimationTrackEditor**
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## Sequence绑定机制笔记
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1. _SpawnableObject_(自动Spawn的Object)
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表示该Object在Sequence被Evaluate的时候自动Spawn，并且由Sequence来管理生命周期
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2. _PossessableObject_(可以被赋予的Object)
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表示该Object可以被外部赋予，比如我手动赋予一个Actor给某个Track
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### UMovieSceneSequence
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UMovieSceneSequence::CreatePossessable()
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UMovieSceneSequence::BindPossessableObject()
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绑定过程可以参考：
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ULevelSequenceEditorSubsystem::AddActorsToBinding(const TArray<AActor*>& Actors, const FMovieSceneBindingProxy& ObjectBinding)
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### ActorToSequencer
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菜单出现逻辑位于：FLevelSequenceEditorActorBinding::BuildSequencerAddMenu(FMenuBuilder& MenuBuilder)。
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`FLevelSequenceEditorActorBinding::AddPossessActorMenuExtensions(FMenuBuilder& MenuBuilder)`
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=>
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`FLevelSequenceEditorActorBinding::AddActorsToSequencer(AActor*const* InActors, int32 NumActors)`
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=>
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`TArray<FGuid> FSequencer::AddActors(const TArray<TWeakObjectPtr<AActor> >& InActors, bool bSelectActors)；`
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=>
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`TArray<FGuid> FSequencerUtilities::AddActors(TSharedRef<ISequencer> Sequencer, const TArray<TWeakObjectPtr<AActor> >& InActors)`
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```c++
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TArray<FGuid> FSequencerUtilities::AddActors(TSharedRef<ISequencer> Sequencer, const TArray<TWeakObjectPtr<AActor> >& InActors)
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{
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TArray<FGuid> PossessableGuids;
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UMovieSceneSequence* Sequence = Sequencer->GetFocusedMovieSceneSequence();
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if (!Sequence)
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{
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return PossessableGuids;
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}
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UMovieScene* MovieScene = Sequence->GetMovieScene();
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if (!MovieScene)
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{
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return PossessableGuids;
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}
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if (MovieScene->IsReadOnly())
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{
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ShowReadOnlyError();
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return PossessableGuids;
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}
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const FScopedTransaction Transaction(LOCTEXT("AddActors", "Add Actors"));
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Sequence->Modify();
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for (TWeakObjectPtr<AActor> WeakActor : InActors)
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{
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if (AActor* Actor = WeakActor.Get())
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{
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FGuid ExistingGuid = Sequencer->FindObjectId(*Actor, Sequencer->GetFocusedTemplateID());
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if (!ExistingGuid.IsValid())
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{
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FGuid PossessableGuid = CreateBinding(Sequencer, *Actor, Actor->GetActorLabel());
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PossessableGuids.Add(PossessableGuid);
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if (ACameraActor* CameraActor = Cast<ACameraActor>(Actor))
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{
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NewCameraAdded(Sequencer, CameraActor, PossessableGuid);
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}
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Sequencer->OnActorAddedToSequencer().Broadcast(Actor, PossessableGuid);
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}
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}
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}
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return PossessableGuids;
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}
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```
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### FAudioTrackEditor
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FAudioTrackEditor::HandleAssetAdded(UObject* Asset, const FGuid& TargetObjectGuid) => FAudioTrackEditor::AddNewSound() => UMovieSceneAudioTrack::AddNewSoundOnRow(USoundBase* Sound, FFrameNumber Time, int32 RowIndex)
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## MovieSceneSkeletalAnimationTrack
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- UMovieSceneSkeletalAnimationTrack
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- UMovieSceneSkeletalAnimationSection
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- FSkeletalAnimationTrackEditor
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- UMovieSceneSkeletalAnimationSystem
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- FSkeletalAnimationTrackEditMode
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Track的编辑器注册位于MovieSceneToolsModule.cpp：
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```c++
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AnimationTrackCreateEditorHandle = SequencerModule.RegisterTrackEditor( FOnCreateTrackEditor::CreateStatic( &FSkeletalAnimationTrackEditor::CreateTrackEditor ) );
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```
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只对UMovieSceneSkeletalAnimationTrack生效：
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```c++
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bool FSkeletalAnimationTrackEditor::SupportsSequence(UMovieSceneSequence* InSequence) const
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{
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ETrackSupport TrackSupported = InSequence ? InSequence->IsTrackSupported(UMovieSceneSkeletalAnimationTrack::StaticClass()) : ETrackSupport::NotSupported;
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return TrackSupported == ETrackSupport::Supported;
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}
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FEditorModeRegistry::Get().RegisterMode<FSkeletalAnimationTrackEditMode>(
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FSkeletalAnimationTrackEditMode::ModeName,
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NSLOCTEXT("SkeletalAnimationTrackEditorMode", "SkelAnimTrackEditMode", "Skeletal Anim Track Mode"),
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FSlateIcon(),
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false);
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```
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### FSkeletalAnimationTrackEditor
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FSkeletalAnimationTrackEditor::BuildTrackContextMenu()：在MovieSceneSkeletalAnimationTrack的Animation上右键出现的菜单。
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FSkeletalAnimationTrackEditor::BuildOutlinerEditWidget：MovieSceneSkeletalAnimationTrack下面生成Animtion那一列。
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## 播放逻辑
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```c++
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ALevelSequenceActor::InitializePlayer()
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ALevelSequenceActor->SequencePlayer->Play();
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ALevelSequenceActor->SequencePlayer->Update(DeltaSeconds);
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```
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具体的逻辑位于UMovieSceneSequencePlayer::PlayInternal()：
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```c++
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void UMovieSceneSequencePlayer::PlayInternal()
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{
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if (NeedsQueueLatentAction())
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{
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QueueLatentAction(FMovieSceneSequenceLatentActionDelegate::CreateUObject(this, &UMovieSceneSequencePlayer::PlayInternal));
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return;
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}
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if (!IsPlaying() && Sequence && CanPlay())
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{
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const FString SequenceName = GetSequenceName(true);
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UE_LOG(LogMovieScene, Verbose, TEXT("PlayInternal - %s (current status: %s)"), *SequenceName, *UEnum::GetValueAsString(Status));
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// Set playback status to playing before any calls to update the position
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Status = EMovieScenePlayerStatus::Playing;
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float PlayRate = bReversePlayback ? -PlaybackSettings.PlayRate : PlaybackSettings.PlayRate;
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// If at the end and playing forwards, rewind to beginning
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if (GetCurrentTime().Time == GetLastValidTime())
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{
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if (PlayRate > 0.f)
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{
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SetPlaybackPosition(FMovieSceneSequencePlaybackParams(FFrameTime(StartTime), EUpdatePositionMethod::Jump));
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}
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}
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else if (GetCurrentTime().Time == FFrameTime(StartTime))
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{
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if (PlayRate < 0.f)
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{
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SetPlaybackPosition(FMovieSceneSequencePlaybackParams(GetLastValidTime(), EUpdatePositionMethod::Jump));
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}
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}
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// Update now
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if (PlaybackSettings.bRestoreState)
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{
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RootTemplateInstance.EnableGlobalPreAnimatedStateCapture();
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}
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bPendingOnStartedPlaying = true;
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Status = EMovieScenePlayerStatus::Playing;
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TimeController->StartPlaying(GetCurrentTime());
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if (PlayPosition.GetEvaluationType() == EMovieSceneEvaluationType::FrameLocked)
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{
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if (!OldMaxTickRate.IsSet())
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{
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OldMaxTickRate = GEngine->GetMaxFPS();
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}
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GEngine->SetMaxFPS(1.f / PlayPosition.GetInputRate().AsInterval());
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}
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//播放的核心逻辑估计在这里。
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if (!PlayPosition.GetLastPlayEvalPostition().IsSet() || PlayPosition.GetLastPlayEvalPostition() != PlayPosition.GetCurrentPosition())
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{
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UpdateMovieSceneInstance(PlayPosition.PlayTo(PlayPosition.GetCurrentPosition()), EMovieScenePlayerStatus::Playing);
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}
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RunLatentActions();
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UpdateNetworkSyncProperties();
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if (bReversePlayback)
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{
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if (OnPlayReverse.IsBound())
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{
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OnPlayReverse.Broadcast();
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}
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}
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else
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{
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if (OnPlay.IsBound())
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{
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OnPlay.Broadcast();
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}
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}
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}
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}
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void UMovieSceneSequencePlayer::UpdateMovieSceneInstance(FMovieSceneEvaluationRange InRange, EMovieScenePlayerStatus::Type PlayerStatus, bool bHasJumped)
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{
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FMovieSceneUpdateArgs Args;
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Args.bHasJumped = bHasJumped;
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UpdateMovieSceneInstance(InRange, PlayerStatus, Args);
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}
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void UMovieSceneSequencePlayer::UpdateMovieSceneInstance(FMovieSceneEvaluationRange InRange, EMovieScenePlayerStatus::Type PlayerStatus, const FMovieSceneUpdateArgs& Args)
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{
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if (Observer && !Observer->CanObserveSequence())
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{
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return;
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}
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UMovieSceneSequence* MovieSceneSequence = RootTemplateInstance.GetSequence(MovieSceneSequenceID::Root);
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if (!MovieSceneSequence)
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{
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return;
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}
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#if !NO_LOGGING
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if (UE_LOG_ACTIVE(LogMovieScene, VeryVerbose))
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{
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const FQualifiedFrameTime CurrentTime = GetCurrentTime();
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const FString SequenceName = GetSequenceName(true);
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UE_LOG(LogMovieScene, VeryVerbose, TEXT("Evaluating sequence %s at frame %d, subframe %f (%f fps)."), *SequenceName, CurrentTime.Time.FrameNumber.Value, CurrentTime.Time.GetSubFrame(), CurrentTime.Rate.AsDecimal());
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}
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#endif
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if (PlaybackClient)
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{
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PlaybackClient->WarpEvaluationRange(InRange);
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}
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// Once we have updated we must no longer skip updates
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bSkipNextUpdate = false;
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// We shouldn't be asked to run an async update if we have a blocking sequence.
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check(!Args.bIsAsync || !EnumHasAnyFlags(MovieSceneSequence->GetFlags(), EMovieSceneSequenceFlags::BlockingEvaluation));
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// We shouldn't be asked to run an async update if we don't have a tick manager.
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check(!Args.bIsAsync || TickManager != nullptr);
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FMovieSceneContext Context(InRange, PlayerStatus);
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Context.SetHasJumped(Args.bHasJumped);
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TSharedPtr<FMovieSceneEntitySystemRunner> Runner = RootTemplateInstance.GetRunner();
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if (Runner)
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{
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Runner->QueueUpdate(Context, RootTemplateInstance.GetRootInstanceHandle());
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if (Runner == SynchronousRunner || !Args.bIsAsync)
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{
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Runner->Flush();
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}
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}
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}
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```
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暂停的核心逻辑：
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```c++
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FMovieSceneEvaluationRange CurrentTimeRange = PlayPosition.GetCurrentPositionAsRange();
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const FMovieSceneContext Context(CurrentTimeRange, EMovieScenePlayerStatus::Stopped);
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Runner->QueueUpdate(Context, RootTemplateInstance.GetRootInstanceHandle(), FSimpleDelegate::CreateWeakLambda(this, FinishPause));
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```
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## SequenceRecorder
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SequenceRecorder模块的基类是ISequenceRecorder。
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