203 lines
8.2 KiB
Markdown
203 lines
8.2 KiB
Markdown
---
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title: UE5商城动画重定向插件笔记
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date: 2023-09-05 12:02:29
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excerpt:
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tags:
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- AnimationRetargeting
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rating: ⭐
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---
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# MixamoAnimationRetargeting
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主要逻辑位于：FMixamoSkeletonRetargeter
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- UE4MannequinToMixamo_BoneNamesMapping
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- UE4MannequinToMixamo_ChainNamesMapping
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- UE5MannequinToMixamo_BoneNamesMapping
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- UE5MannequinToMixamo_ChainNamesMapping
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重定向逻辑位于：FMixamoSkeletonRetargeter::Retarget()
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## 生成TPose
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```c++
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static const TArray<FName> Mixamo_PreserveComponentSpacePose_BoneNames = {
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"Head",
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"LeftToeBase",
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"RightToeBase"
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#ifdef MAR_UPPERARMS_PRESERVECS_EXPERIMENTAL_ENABLE_
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,"RightShoulder"
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,"RightArm" ,"LeftShoulder" ,"LeftArm"#endif
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};
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static const TArray<TPair<FName, FName>> Mixamo_ParentChildBoneNamesToBypassOneChildConstraint = {
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{"LeftUpLeg", "LeftLeg"},
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{"LeftLeg", "LeftFoot"},
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{"LeftFoot", "LeftToeBase"},
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{"LeftToeBase", "LeftToe_End"},
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{"RightUpLeg", "RightLeg"},
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{"RightLeg", "RightFoot"},
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{"RightFoot", "RightToeBase"},
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{"RightToeBase", "RightToe_End"},
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{"Hips", "Spine"}, // Heuristic to try to align better the part.
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{"Spine", "Spine1"},
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{"Spine1", "Spine2"},
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{"Spine2", "Neck"}, // Heuristic to try to align better the part.
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{"Neck", "Head"},
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{"Head", "HeadTop_End"},
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{"LeftShoulder", "LeftArm"},
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{"LeftArm", "LeftForeArm"},
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{"LeftForeArm", "LeftHand"},
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{"LeftHand", "LeftHandMiddle1"}, // Heuristic to try to align better the part.
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{"LeftHandIndex1", "LeftHandIndex2"},
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{"LeftHandIndex2", "LeftHandIndex3"},
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{"LeftHandIndex3", "LeftHandIndex4"},
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{"LeftHandMiddle1", "LeftHandMiddle2"},
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{"LeftHandMiddle2", "LeftHandMiddle3"},
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{"LeftHandMiddle3", "LeftHandMiddle4"},
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{"LeftHandPinky1", "LeftHandPinky2"},
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{"LeftHandPinky2", "LeftHandPinky3"},
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{"LeftHandPinky3", "LeftHandPinky4"},
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{"LeftHandRing1", "LeftHandRing2"},
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{"LeftHandRing2", "LeftHandRing3"},
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{"LeftHandRing3", "LeftHandRing4"},
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{"LeftHandThumb1", "LeftHandThumb2"},
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{"LeftHandThumb2", "LeftHandThumb3"},
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{"LeftHandThumb3", "LeftHandThumb4"},
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{"RightShoulder", "RightArm"},
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{"RightArm", "RightForeArm"},
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{"RightForeArm", "RightHand"},
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{"RightHand", "RightHandMiddle1"}, // Heuristic to try to align better the part.
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{"RightHandIndex1", "RightHandIndex2"},
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{"RightHandIndex2", "RightHandIndex3"},
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{"RightHandIndex3", "RightHandIndex4"},
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{"RightHandMiddle1", "RightHandMiddle2"},
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{"RightHandMiddle2", "RightHandMiddle3"},
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{"RightHandMiddle3", "RightHandMiddle4"},
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{"RightHandPinky1", "RightHandPinky2"},
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{"RightHandPinky2", "RightHandPinky3"},
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{"RightHandPinky3", "RightHandPinky4"},
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{"RightHandRing1", "RightHandRing2"},
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{"RightHandRing2", "RightHandRing3"},
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{"RightHandRing3", "RightHandRing4"},
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{"RightHandThumb1", "RightHandThumb2"},
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{"RightHandThumb2", "RightHandThumb3"},
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{"RightHandThumb3", "RightHandThumb4"}
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};
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RetargetBasePose(
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SkeletalMeshes,
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ReferenceSkeleton,
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Mixamo_PreserveComponentSpacePose_BoneNames,
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UEMannequinToMixamo_BoneNamesMapping.GetInverseMapper(),
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Mixamo_ParentChildBoneNamesToBypassOneChildConstraint,
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/*bApplyPoseToRetargetBasePose=*/true,
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UIKRetargeterController::GetController(IKRetargeter_UEMannequinToMixamo)
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);
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```
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## 判断骨骼结构是否符合要求
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```c++
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bool FMixamoSkeletonRetargeter::IsMixamoSkeleton(const USkeleton * Skeleton) const
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{
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// We consider a Skeleton "coming from Mixamo" if it has at least X% of the expected bones.
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const float MINIMUM_MATCHING_PERCENTAGE = .75f;
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// Convert the array of expected bone names (TODO: cache it...).
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TArray<FName> BoneNames;
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UE4MannequinToMixamo_BoneNamesMapping.GetDestination(BoneNames);
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// Look for and count the known Mixamo bones (see comments on IndexLastCheckedMixamoBone and UEMannequinToMixamo_BonesMapping).
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constexpr int32 NumBones = (IndexLastCheckedMixamoBone + 1) / 2;
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BoneNames.SetNum(NumBones);
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FSkeletonMatcher SkeletonMatcher(BoneNames, MINIMUM_MATCHING_PERCENTAGE);
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return SkeletonMatcher.IsMatching(Skeleton);
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}
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bool FSkeletonMatcher::IsMatching(const USkeleton* Skeleton) const
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{
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// No Skeleton, No matching...
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if (Skeleton == nullptr)
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{ return false;
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}
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const int32 NumExpectedBones = BoneNames.Num();
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int32 nMatchingBones = 0;
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const FReferenceSkeleton & SkeletonRefSkeleton = Skeleton->GetReferenceSkeleton();
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for (int32 i = 0; i < NumExpectedBones; ++i)
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{ const int32 BoneIndex = SkeletonRefSkeleton.FindBoneIndex(BoneNames[i]);
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if (BoneIndex != INDEX_NONE)
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{ ++nMatchingBones;
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} } const float MatchedPercentage = float(nMatchingBones) / float(NumExpectedBones);
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return MatchedPercentage >= MinimumMatchingPerc;
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}
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```
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enum class ETargetSkeletonType
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{
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ST_UNKNOWN = 0,
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ST_UE4_MANNEQUIN,
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ST_UE5_MANNEQUIN,
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ST_SIZE
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};
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static const char* const kUE4MannequinToMixamo_BoneNamesMapping[] = {
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// UE Mannequin bone name MIXAMO bone name
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"root", "root",
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"pelvis", "Hips",
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"spine_01", "Spine",
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"spine_02", "Spine1",
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"spine_03", "Spine2",
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"neck_01", "Neck",
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"head", "head",
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"clavicle_l", "LeftShoulder",
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"upperarm_l", "LeftArm",
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"lowerarm_l", "LeftForeArm",
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"hand_l", "LeftHand",
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"clavicle_r", "RightShoulder",
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"upperarm_r", "RightArm",
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"lowerarm_r", "RightForeArm",
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"hand_r", "RightHand",
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"thigh_l", "LeftUpLeg",
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"calf_l", "LeftLeg",
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"foot_l", "LeftFoot",
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"ball_l", "LeftToeBase",
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"thigh_r", "RightUpLeg",
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"calf_r", "RightLeg",
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"foot_r", "RightFoot",
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"ball_r", "RightToeBase",
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// From here, ignored to determine if a skeleton is from Mixamo.
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// From here, ignored to determine if a skeleton is from UE Mannequin. "index_01_l", "LeftHandIndex1",
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"index_02_l", "LeftHandIndex2",
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"index_03_l", "LeftHandIndex3",
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"middle_01_l", "LeftHandMiddle1",
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"middle_02_l", "LeftHandMiddle2",
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"middle_03_l", "LeftHandMiddle3",
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"pinky_01_l", "LeftHandPinky1",
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"pinky_02_l", "LeftHandPinky2",
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"pinky_03_l", "LeftHandPinky3",
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"ring_01_l", "LeftHandRing1",
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"ring_02_l", "LeftHandRing2",
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"ring_03_l", "LeftHandRing3",
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"thumb_01_l", "LeftHandThumb1",
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"thumb_02_l", "LeftHandThumb2",
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"thumb_03_l", "LeftHandThumb3",
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"index_01_r", "RightHandIndex1",
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"index_02_r", "RightHandIndex2",
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"index_03_r", "RightHandIndex3",
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"middle_01_r", "RightHandMiddle1",
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"middle_02_r", "RightHandMiddle2",
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"middle_03_r", "RightHandMiddle3",
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"pinky_01_r", "RightHandPinky1",
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"pinky_02_r", "RightHandPinky2",
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"pinky_03_r", "RightHandPinky3",
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"ring_01_r", "RightHandRing1",
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"ring_02_r", "RightHandRing2",
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"ring_03_r", "RightHandRing3",
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"thumb_01_r", "RightHandThumb1",
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"thumb_02_r", "RightHandThumb2",
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"thumb_03_r", "RightHandThumb3",
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// Un-mapped bones (at the moment). Here for reference.
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//"lowerarm_twist_01_l", nullptr, //"upperarm_twist_01_l", nullptr, //"lowerarm_twist_01_r", nullptr, //"upperarm_twist_01_r", nullptr, //"calf_twist_01_l", nullptr, //"thigh_twist_01_l", nullptr, //"calf_twist_01_r", nullptr, //"thigh_twist_01_r", nullptr, //"ik_foot_root", nullptr, //"ik_foot_l", nullptr, //"ik_foot_r", nullptr, //"ik_hand_root", nullptr, //"ik_hand_gun", nullptr, //"ik_hand_l", nullptr, //"ik_hand_r", nullptr,};
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# EasyPose
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