float UAnimInstance::GetSlotWeight(FName SlotNodeName)
{
float TotalSum = 0.f;
#if DEBUGMONTAGEWEIGHT
float TotalDesiredWeight = 0.f;
#endif
// first get all the montage instance weight this slot node has
for (int32 I = 0; I < MontageInstances.Num(); ++I)
{
FAnimMontageInstance* MontageInstance = MontageInstances[I];
if (MontageInstance && MontageInstance->IsValid() && MontageInstance->Montage->IsValidSlot(SlotNodeName))
{
TotalSum += MontageInstance->Weight;
#if DEBUGMONTAGEWEIGHT
TotalDesiredWeight += MontageInstance->DesiredWeight;
#endif
}
}
// this can happen when it's blending in OR when newer animation comes in with shorter blendtime
// say #1 animation was blending out time with current blendtime 1.0 #2 animation was blending in with 1.0 (old) but got blend out with new blendtime 0.2f
// #3 animation was blending in with the new blendtime 0.2f, you'll have sum of #1, 2, 3 exceeds 1.f
if (TotalSum > 1.f + ZERO_ANIMWEIGHT_THRESH)
{
// first get all the montage instance weight this slot node has
for (int32 I=0; I<MontageInstances.Num(); ++I)
{
FAnimMontageInstance * MontageInstance = MontageInstances[I];
if (MontageInstance && MontageInstance->IsValid() && MontageInstance->Montage->IsValidSlot(SlotNodeName))
{
MontageInstance->Weight/=TotalSum;
}
}
}
#if DEBUGMONTAGEWEIGHT
else if (TotalDesiredWeight == 1.f && TotalSum < 1.f - ZERO_ANIMWEIGHT_THRESH)
{
// this can happen when it's blending in OR when newer animation comes in with longer blendtime
// say #1 animation was blending out time with current blendtime 0.2 #2 animation was blending in with 0.2 (old) but got blend out with new blendtime 1.f
// #3 animation was blending in with the new blendtime 1.f, you'll have sum of #1, 2, 3 doesn't meet 1.f
UE_LOG(LogAnimation, Warning, TEXT("[%s] Montage has less weight. Blending in?(%f)"), *SlotNodeName.ToString(), TotalSum);
}
#endif
return FMath::Clamp<float>(TotalSum, 0.f, 1.f);
}
void UAnimInstance::UpdateRootMotionMontageInstance()
{
FAnimMontageInstance * ActiveMontageInstance = GetActiveMontageInstance();
const bool bValidRootMotionInstance = (ActiveMontageInstance && ActiveMontageInstance->IsValid() && ActiveMontageInstance->Montage
&& (ActiveMontageInstance->Montage->bEnableRootMotionTranslation || ActiveMontageInstance->Montage->bEnableRootMotionRotation) );
RootMotionMontageInstance = bValidRootMotionInstance ? ActiveMontageInstance : NULL;
}
FAnimMontageInstance* UAnimInstance::GetActiveMontageInstance()
{
if ( MontageInstances.Num() > 0 )
{
FAnimMontageInstance * RetVal = MontageInstances.Last();
if ( RetVal->IsValid() )
{
return RetVal;
}
}
return NULL;
}
void UAnimInstance::SlotEvaluatePose(FName SlotNodeName, const FA2Pose & SourcePose, FA2Pose & BlendedPose, float SlotNodeWeight)
{
SCOPE_CYCLE_COUNTER(STAT_AnimNativeEvaluatePoses);
if ( SlotNodeWeight > ZERO_ANIMWEIGHT_THRESH )
{
// final output of slot pose
FA2Pose SlotPose;
SlotPose.Bones.AddUninitialized(SourcePose.Bones.Num());
/// blend helper variables
TArray<FA2Pose> MontagePoses;
TArray<float> MontageWeights;
TArray<FAnimMontageInstance *> ValidMontageInstances;
// first pass we go through collect weights and valid montages.
for (auto Iter = MontageInstances.CreateConstIterator(); Iter; ++Iter)
{
FAnimMontageInstance * MontageInstance = (*Iter);
// @todo make this struct?
if (MontageInstance->IsValid() && MontageInstance->Montage->IsValidSlot(SlotNodeName))
{
int32 NewIndex = MontageWeights.AddUninitialized(1);
MontagePoses.AddZeroed(1);
ValidMontageInstances.Add(MontageInstance);
MontagePoses[NewIndex].Bones.AddUninitialized(BlendedPose.Bones.Num());
MontageWeights[NewIndex] = MontageInstance->Weight;
}
}
// clean up the MontageWeights to see if they're not summing up correctly
float TotalSum = 0.f;
for (int32 I=0; I<MontageWeights.Num(); ++I)
{
// normalize I
TotalSum += MontageWeights[I];
}
// if it has any valid weight
if ( TotalSum > ZERO_ANIMWEIGHT_THRESH )
{
// but not 1.f. If 1.f it's useless
if (FMath::IsNearlyEqual(TotalSum, 1.f) == false)
{
for (int32 I=0; I<MontageWeights.Num(); ++I)
{
// normalize I
MontageWeights[I] /= TotalSum;
}
}
}
else
{
FAnimationRuntime::FillWithRefPose(BlendedPose.Bones, RequiredBones);
// nothing else to do here, there is no weight
return;
}
// if not, something went wrong. It should have something
check (ValidMontageInstances.Num() > 0);
// second pass, we fill up MontagePoses with valid data to be full pose
for (int32 I=0; I<ValidMontageInstances.Num(); ++I)
{
FAnimMontageInstance * MontageInstance = ValidMontageInstances[I];
const FAnimTrack * AnimTrack = MontageInstance->Montage->GetAnimationData(SlotNodeName);
// find out if this is additive animation
EAdditiveAnimationType AdditiveAnimType = AAT_None;
if (AnimTrack->IsAdditive())
{
AdditiveAnimType = AnimTrack->IsRotationOffsetAdditive()? AAT_RotationOffsetMeshSpace : AAT_LocalSpaceBase;
}
// get the pose data, temporarily use SlotPose
FAnimExtractContext ExtractionContext(MontageInstance->Position, false, MontageInstance->Montage->bEnableRootMotionTranslation, MontageInstance->Montage->bEnableRootMotionRotation, MontageInstance->Montage->RootMotionRootLock);
FAnimationRuntime::GetPoseFromAnimTrack(*AnimTrack, RequiredBones, SlotPose.Bones, ExtractionContext);
// if additive, we should blend with source to make it fullbody
if (AdditiveAnimType == AAT_LocalSpaceBase)
{
ApplyAdditiveSequence(SourcePose,SlotPose,MontageWeights[I],MontagePoses[I]);
}
else if (AdditiveAnimType == AAT_RotationOffsetMeshSpace)
{
BlendRotationOffset(SourcePose,SlotPose,MontageWeights[I],MontagePoses[I]);
}
else
{
CopyPose(SlotPose, MontagePoses[I]);
}
}
// allocate for blending
FTransformArrayA2** BlendingPoses = new FTransformArrayA2*[MontagePoses.Num()];
for (int32 I=0; I<MontagePoses.Num(); ++I)
{
BlendingPoses[I] = &MontagePoses[I].Bones;
}
// now time to blend all montages
FAnimationRuntime::BlendPosesTogether(MontagePoses.Num(), (const FTransformArrayA2**)BlendingPoses, (const float*)MontageWeights.GetData(), RequiredBones, SlotPose.Bones);
// clean up memory
delete[] BlendingPoses;
// now blend with Source
if ( SlotNodeWeight > 1-ZERO_ANIMWEIGHT_THRESH )
{
BlendedPose = SlotPose;
}
else
{
// normal non-additive animations
BlendSequences(SourcePose, SlotPose, SlotNodeWeight, BlendedPose);
}
}
else
{
BlendedPose = SourcePose;
}
}