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API > API/Plugins > API/Plugins/MovieSceneAnimMixer
Abstract base class for all Anim Mixer transition section types. Transition sections handle blending between two overlapping animation sections on the same layer.
Transition tasks follow a create-once, update-each-frame pattern:
CreateTransitionTask() is called once during entity import to create the task
The mixer system calls Update() on the task each frame to set from/to tasks and timing
The task persists as an entity component, allowing it to maintain state across frames
| Name | UMovieSceneAnimTransitionSectionBase |
| Type | class |
| Header File | /Engine/Plugins/Experimental/MovieSceneAnimMixer/Source/MovieSceneAnimMixer/Public/MovieSceneAnimTransitionSectionBase.h |
| Include Path | #include "MovieSceneAnimTransitionSectionBase.h" |
Syntax
UCLASS (Abstract, MinimalAPI)
class UMovieSceneAnimTransitionSectionBase :
public UMovieSceneSection ,
public IMovieSceneEntityProvider ,
public IMovieSceneAnimationMixerItemInterface
Inheritance Hierarchy
- UObjectBase → UObjectBaseUtility → UObject → UMovieSceneSignedObject → UMovieSceneDecorationContainerObject → UMovieSceneSection → UMovieSceneAnimTransitionSectionBase
Implements Interfaces
Derived Classes
Constructors
| Name | Remarks | Include Path | Unreal Specifiers |
|---|---|---|---|
UMovieSceneAnimTransitionSectionBase
(
const FObjectInitializer& ObjInit |
MovieSceneAnimTransitionSectionBase.h |
Variables
Public
| Name | Type | Remarks | Include Path | Unreal Specifiers |
|---|---|---|---|---|
| FromSection | TObjectPtr< UMovieSceneSection > | The section that this transition blends FROM (earlier in time) | MovieSceneAnimTransitionSectionBase.h | |
| ToSection | TObjectPtr< UMovieSceneSection > | The section that this transition blends TO (later in time) | MovieSceneAnimTransitionSectionBase.h |
Functions
Public
| Name | Remarks | Include Path | Unreal Specifiers |
|---|---|---|---|
TRange< FFrameNumber > ComputeOverlapRange() |
Get the computed overlap range between from and to sections | MovieSceneAnimTransitionSectionBase.h | |
float GetTransitionProgress
(
FFrameTime InTime |
Get transition progress [0,1] at the given time. 0 = start of transition, 1 = end | MovieSceneAnimTransitionSectionBase.h | |
bool IsValid() |
Check if this transition is structurally valid (sections exist, same row, bounded, overlap exists, neither fully contained) | MovieSceneAnimTransitionSectionBase.h | |
void ScaleKeysToRange
(
const TRange< FFrameNumber >& OldRange, |
Scale blend weight keys proportionally from old range to new range | MovieSceneAnimTransitionSectionBase.h | |
bool UpdateBoundsFromSourceSections() |
Update this transition's bounds to match the current overlap of from/to sections | MovieSceneAnimTransitionSectionBase.h |
Public Virtual
| Name | Remarks | Include Path | Unreal Specifiers |
|---|---|---|---|
virtual EMovieSceneChannelProxyType CacheChannelProxy() |
MovieSceneAnimTransitionSectionBase.h | ||
virtual TSharedPtr< FAnimNextTransitionEvaluationTask > CreateTransitionTask () |
Create the evaluation task for this transition. | MovieSceneAnimTransitionSectionBase.h | |
virtual const FMovieSceneFloatChannel * GetBlendWeightChannel () |
Get the blend weight channel for evaluation. | MovieSceneAnimTransitionSectionBase.h | |
virtual FText GetTransitionDisplayName() |
Get a short display name for this transition type. Used for tooltips and other UI elements. | MovieSceneAnimTransitionSectionBase.h | |
virtual FName GetTransitionIconStyleName () |
Get the icon style name for this transition type. | MovieSceneAnimTransitionSectionBase.h | |
virtual void ImportEntityImpl
(
UMovieSceneEntitySystemLinker* EntityLinker, |
MovieSceneAnimTransitionSectionBase.h | ||
virtual void InitializeDefaultCurve() |
Called after the section range is set to initialize any default curves/channels | MovieSceneAnimTransitionSectionBase.h | |
virtual bool PopulateEvaluationFieldImpl
(
const TRange< FFrameNumber >& EffectiveRange, |
MovieSceneAnimTransitionSectionBase.h |
Overridden from UMovieSceneSection
| Name | Remarks | Include Path | Unreal Specifiers |
|---|---|---|---|
virtual bool IsLocalEvalDisabled() |
MovieSceneAnimTransitionSectionBase.h |
Overridden from IMovieSceneAnimationMixerItemInterface
| Name | Remarks | Include Path | Unreal Specifiers |
|---|---|---|---|
virtual FColor GetMixerItemTint() |
MovieSceneAnimTransitionSectionBase.h | ||
virtual bool IsVisibleInAddSectionMenu() |
MovieSceneAnimTransitionSectionBase.h | ||
virtual bool SupportsVerticalDragging() |
MovieSceneAnimTransitionSectionBase.h |
Protected Virtual
| Name | Remarks | Include Path | Unreal Specifiers |
|---|---|---|---|
virtual void RebuildChannelProxy
(
FMovieSceneChannelProxyData& Channels |
Subclasses implement to register their specific channels | MovieSceneAnimTransitionSectionBase.h |