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03-UnrealEngine/Animation/UE5动画重定向核心逻辑笔记.md
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@ -43,14 +43,50 @@ FRootRetargeter::EncodePose():
FRootRetargeter::DecodePose():
```c++
// InitialTransform 为重定向Pose计算出的数值，通过比值计算出Target的Current数值
const FTransform InitialTransform = SourceSkeleton.RetargetGlobalPose[Source.BoneIndex];
float InitialHeight = InitialTransform.GetTranslation().Z;
Source.InitialHeightInverse = 1.0f / InitialHeight;
Source.CurrentPositionNormalized = Source.CurrentPosition * Source.InitialHeightInverse;
FVector Position;
{
// 关键：InitialTransform 为重定向Pose计算出的数值，通过比值计算出Target的Current数值
const FVector RetargetedPosition = Source.CurrentPositionNormalized * Target.InitialHeight;
// 根据RetargetSetting中设置的BlendToSourceWeights与BlendToSource，与SourcePosition进行混合。
Position = FMath::Lerp(RetargetedPosition, Source.CurrentPosition, Settings.BlendToSource*Settings.BlendToSourceWeights);
// generate basic retarget root position by scaling the normalized position by root height
const FVector RetargetedPosition = Source.CurrentPositionNormalized * Target.InitialHeight;
// 应用vertical / horizontal的缩放
FVector ScaledRetargetedPosition = Position;
ScaledRetargetedPosition.Z *= Settings.ScaleVertical;
const FVector HorizontalOffset = (ScaledRetargetedPosition - Target.InitialPosition) * FVector(Settings.ScaleHorizontal, Settings.ScaleHorizontal, 1.0f);
Position = Target.InitialPosition + HorizontalOffset;
// 应用RetargetSetting中Position偏移。
Position += Settings.TranslationOffset;
// blend with alpha
Position = FMath::Lerp(Target.InitialPosition, Position, Settings.TranslationAlpha);
// 记录偏差
Target.RootTranslationDelta = Position - RetargetedPosition;
}
FQuat Rotation;
{
// calc offset between initial source/target root rotations
const FQuat RotationDelta = Source.CurrentRotation * Source.InitialRotation.Inverse();
// add retarget pose delta to the current source rotation
const FQuat RetargetedRotation = RotationDelta * Target.InitialRotation;
// add static rotation offset
Rotation = RetargetedRotation * Settings.RotationOffset.Quaternion();
// blend with alpha
Rotation = FQuat::FastLerp(Target.InitialRotation, Rotation, Settings.RotationAlpha);
Rotation.Normalize();
// record the delta created by all the modifications made to the root rotation
Target.RootRotationDelta = RetargetedRotation * Target.InitialRotation.Inverse();
}
// apply to target
FTransform& TargetRootTransform = OutTargetGlobalPose[Target.BoneIndex];
TargetRootTransform.SetTranslation(Position);
TargetRootTransform.SetRotation(Rotation);
```
## RunFKRetarget()
FChainEncoderFK::EncodePose():