Unreal Engine Issues

UE-89834

Rare assertion comes up when cooking if sequencer camera track has only additive transform track

Rare assertion comes up when cooking if sequencer camera track has only additive transform track

UDN
Description

If a camera track has only additive transform track, some functions return uninitialized F3DTransformTrackToken made by default constructor.
It causes a rare assertion.

Please take a look at
F3DTransformTrackToken::F3DTransformTrackToken(),
FComponentTransformActuator::RetrieveCurrentValue(...) and
FSimulatedComponentTransformActuator::RetrieveCurrentValue(...)

The initialization code below can fix this issue.

// code placeholder
struct F3DTransformTrackToken
{
     F3DTransformTrackToken()
         :Translation(FVector::ZeroVector),
         Rotation(FRotator::ZeroRotator),
         Scale(FVector::OneVector)
     {
     }
Steps to Reproduce
  1. open the attached project [Link Removed] with UE4.21
  2. repeat creating a package for windows64bit with package button on the menu bar
  3. see package log

 
Following code is useful to see this behavior
 

// code placeholder
at FComponentTransformActuator::Actuate

virtual void Actuate(FMovieSceneInterrogationData& InterrogationData, const F3DTransformTrackToken& InValue, const TBlendableTokenStack<F3DTransformTrackToken>& OriginalStack, const FMovieSceneContext& Context) const override
	{
 #if !UE_GAME
        if( IsRunningCommandlet() )
        {
            UE_LOG(LogMovieSceneDebug, Display, TEXT("Rotation %s Translation %s"), *InValue.Rotation.ToString(), *InValue.Translation.ToString() );
        }
 #endif
 		InterrogationData.Add(FTransform(InValue.Rotation.Quaternion(), InValue.Translation, InValue.Scale), UMovieScene3DTransformTrack::GetInterrogationKey());
	}

 

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Fixed
ComponentUE - Anim - Sequencer
Affects Versions4.21
Target Fix4.25
Fix Commit11645171
Main Commit11823621
Release Commit11645171
CreatedMar 2, 2020
ResolvedMar 2, 2020
UpdatedJul 30, 2020
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