Crash when using AnimBudgetAllocator

In the AnimNode_Slot code, It seems that update() and evaluate() should be called by following order because in TickAnimation step, we need to make MontageEvaluateData valid.

1. SkeletalMeshComponent::Update ( TickAnimation )
2. SkeletalMeshComponent::Evaluate ( RefreshBoneTransform )

however when using AnimBudgetAllocator, tick can be skipped and

problem occurs when Evaluate() called without update().

licensee seems to have solved this problem through the code below. 

AnimInstanceProxy.cpp
---------------------
bool FAnimInstanceProxy::IsInvalidMontageEvaluationData() const
{
	return MontageEvaluationData.ContainsByPredicate([](const FMontageEvaluationState& state){ return state.Montage.IsValid() == false; });
}
 
AnimNode_Slot.cpp
---------------------
FPoseContext SourceContext(Output);
if (WeightData.SourceWeight > ZERO_ANIMWEIGHT_THRESH || Output.AnimInstanceProxy->IsInvalidMontageEvaluationData())
{
	Source.Evaluate(SourceContext);
}

When using AnimBudgetAllocator, during the AnimNode Evaluating stage​, Bone Transform becomes invalid, and it causes a crash at TransformVectorized.h 1240 line

it is reproduced in the following situation

• SkeletalMeshComponent is not in AlwaysTick state (ex. Ticking every 3 frames)
• Among the AnimNodes that need to be evaluated, there is AnimNode_Slot (ex. play montage slot)
  • The internal weight values of AnimNode_Slot are: SourceWeight 0, SlotWeight 1
• Situation where SkeletalMeshComponent tick is disabled and then re-enabled outside of AnimBudgetAllocator ( SetComponentTickEnabled() )

Request a info about UE-127172 bug tracker

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