304 lines
14 KiB
Markdown
304 lines
14 KiB
Markdown
---
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title: UE5动画重定向笔记
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date: 2023-08-18 18:08:12
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excerpt:
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tags:
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rating: ⭐
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---
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# ConvertAnimation()
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主要逻辑位于`UAnimationEditorUtilityLibrary::ConvertAnimation()`或者`FIKRetargetBatchOperation::ConvertAnimation()`。核心重定向逻辑为`UIKRetargetProcessor::RunRetargeter()`。
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## RunRootRetarget()
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FRootRetargeter::EncodePose():
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取得输入的根骨骼Transform数据并给`FRootSource Source`赋值。
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FRootRetargeter::DecodePose():
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```c++
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// InitialTransform 为重定向Pose计算出的数值，通过比值计算出Target的Current数值
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const FTransform InitialTransform = SourceSkeleton.RetargetGlobalPose[Source.BoneIndex];
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float InitialHeight = InitialTransform.GetTranslation().Z;
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Source.InitialHeightInverse = 1.0f / InitialHeight;
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Source.CurrentPositionNormalized = Source.CurrentPosition * Source.InitialHeightInverse;
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// generate basic retarget root position by scaling the normalized position by root height
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const FVector RetargetedPosition = Source.CurrentPositionNormalized * Target.InitialHeight;
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```
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## RunFKRetarget()
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FChainEncoderFK::EncodePose():
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从骨骼链拷贝全局输入到CurrentGlobalTransforms
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FChainDecoderFK::DecodePose():
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## RunIKRetarget()
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## RunPoleVectorMatching()
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# UIKRetargetProcessor
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# FBX SDK setup for Qt
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https://help.autodesk.com/view/FBX/2020/ENU/?guid=FBX_Developer_Help_welcome_to_the_fbx_sdk_html
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使用之前建议**仔细查看文档**。FBX Sdk有三种库，分别为动态链接库(dll + lib)、静态链接库(/MD)、静态链接库(/MT)。
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- 动态链接库：使用Qt的导入库功能，导入动态库之后，只需要再添加一行`DEFINES += FBXSDK_SHARED`即可。例如：
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```qmake
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QT += core gui
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greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
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CONFIG += c++17
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DEFINES += FBXSDK_SHARED
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# You can make your code fail to compile if it uses deprecated APIs.
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# In order to do so, uncomment the following line.
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#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
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SOURCES += \
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Common/Common.cpp \
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main.cpp \
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mainwindow.cpp
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HEADERS += \
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Common/Common.h \
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mainwindow.h
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FORMS += \
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mainwindow.ui
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# Default rules for deployment.
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qnx: target.path = /tmp/$${TARGET}/bin
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else: unix:!android: target.path = /opt/$${TARGET}/bin
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!isEmpty(target.path): INSTALLS += target
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win32:CONFIG(release, debug|release): LIBS += -L$$PWD/FBXSdk/lib/vs2022/x64/release/ -llibfbxsdk
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else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/FBXSdk/lib/vs2022/x64/debug/ -llibfbxsdk
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INCLUDEPATH += $$PWD/FBXSdk/lib/vs2022/x64/debug
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DEPENDPATH += $$PWD/FBXSdk/lib/vs2022/x64/debug
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INCLUDEPATH += $$PWD/FBXSdk/include
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```
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- 静态链接库(/MD)：使用Qt的导入库功能，导入静态库之后，
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- 静态链接库(/MT)：使用Qt的导入库功能，导入静态库之后，
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## Qt相关设置添加
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https://blog.csdn.net/libaineu2004/article/details/105718847
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Qt在pro中设置运行时库MT、MTd、MD、MDd，重点关注QMAKE_CFLAGS
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多线程调试Dll (/MDd) 对应的是MD_DynamicDebug
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多线程Dll (/MD) 对应的是MD_DynamicRelease
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多线程(/MT) 对应的是MD_StaticRelease
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多线程(/MTd)对应的是MD_StaticDebug
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## /NODEFAULTLIB:library
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```cpp
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win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../LIBRARYNAME/Lib/ -lLIBRARY /NODEFAULTLIB:library
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```
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## Ubuntu安装需要额外安装（Qt）
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```cpp
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sudo apt install --reinstall libgl-dev
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```
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# FBX结构
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FBX SDK场景图是通过`FbxScene`类抽象出来的。场景被组织为节点层次结构 ( `FbxNode`)。场景的根节点通过 访问`FbxScene::GetRootNode()`。场景元素（例如网格、灯光或相机）是通过将`FbxNode`与 的子类组合来定义的`FbxNodeAttribute`。
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使用Ansii方式输出就可以使用vscode直接查看内部数据结构。
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- GlobalMaterial：世界坐标矩阵
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- LocalMaterial：相对空间矩阵
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## 动画
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- 动画堆栈 ( `FbxAnimStack`)：动画数据最顶层容器，每一个**AnimStack**可以视为一个镜头，包含多个**FbxAnimLayer**。
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- 动画层 ( `FbxAnimLayer`)：每个**AnimLayer**中可以包含多个**FbxAnimCurve**。
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- 动画曲线节点 ( `FbxAnimCurveNode`)
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- 动画曲线 ( `FbxAnimCurve`) ：动画以曲线的方式存在。可以针对骨骼的Location、Rotation分别添加曲线。
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- 动画曲线关键点 ( `FbxAnimCurveKey`)：动画关键帧。
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每个动画数据都存在对应的节点的属性中（Maya中可以给Shape的属性K帧），可以通过类似`lAnimCurve = pNode->LclTranslation.GetCurve(pAnimLayer, FBXSDK_CURVENODE_COMPONENT_Y);`的方式取得动画曲线。
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UE导出的FBX相关属性为：
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```json
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AnimationStack: 1767515526080, "AnimStack::Unreal Take", "" {
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Properties70: {
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P: "Description", "KString", "", "", "Animation Take for Unreal."
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P: "LocalStop", "KTime", "Time", "",183205094709
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}
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}
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AnimationLayer: 1770224712128, "AnimLayer::Base Layer", "" {
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}
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NodeAttribute: 1767517959504, "NodeAttribute::Root", "Root" {
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TypeFlags: "Null", "Skeleton", "Root"
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}
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NodeAttribute: 1767517960848, "NodeAttribute::Pelvis", "LimbNode" {
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TypeFlags: "Skeleton"
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}
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NodeAttribute: 1767517959696, "NodeAttribute::L_Hip", "LimbNode" {
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TypeFlags: "Skeleton"
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}
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NodeAttribute: 1767517960080, "NodeAttribute::L_Knee", "LimbNode" {
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TypeFlags: "Skeleton"
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}
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AnimationCurve: 1770213770432, "AnimCurve::", "" {
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Default: 0
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KeyVer: 4009
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KeyTime: *120 {
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a: 0,1539538600,3079077200,4618615800,6158154400,7697693000,9237231600,10776770200,12316308800,13855847400,15395386000,16934924600,18474463200,20014001800,21553540400,23093079000,24632617600,26172156200,27711694800,29251233400,30790772000,32330310600,33869849200,35409387800,36948926400,38488465000,40028003600,41567542200,43107080800,44646619400,46186158000,47725696600,49265235200,50804773800,52344312400,53883851000,55423389600,56962928200,58502466800,60042005400,61581544000,63121082600,64660621200,66200159800,67739698400,69279237000,70818775600,72358314200,73897852800,75437391400,76976930000,78516468600,80056007200,81595545800,83135084400,84674623000,86214161600,87753700200,89293238800,90832777400,92372316000,93911854600,95451393200,96990931800,98530470400,100070009000,101609547600,103149086200,104688624800,106228163400,107767702000,109307240600,110846779200,112386317800,113925856400,115465395000,117004933600,118544472200,120084010800,121623549400,123163088000,124702626600,126242165200,127781703800,129321242400,130860781000,132400319600,133939858200,135479396800,137018935400,138558474000,140098012600,141637551200,143177089800,144716628400,146256167000,147795705600,149335244200,150874782800,152414321400,153953860000,155493398600,157032937200,158572475800,160112014400,161651553000,163191091600,164730630200,166270168800,167809707400,169349246000,170888784600,172428323200,173967861800,175507400400,177046939000,178586477600,180126016200,181665554800,183205093400
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}
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KeyValueFloat: *120 {
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a: -0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0
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}
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;KeyAttrFlags: Cubic|TangeantAuto|GenericTimeIndependent, Constant|ConstantStandard
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KeyAttrFlags: *2 {
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a: 8456,8194
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}
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;KeyAttrDataFloat: RightAuto:0, NextLeftAuto:0; RightSlope:0, NextLeftSlope:0, RightWeight:0.333333, NextLeftWeight:0.333333, RightVelocity:0, NextLeftVelocity:0
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KeyAttrDataFloat: *8 {
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a: 0,0,218434821,0,0,0,218434821,0
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}
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KeyAttrRefCount: *2 {
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a: 119,1
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}
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}
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AnimationCurve: 1770213768992, "AnimCurve::", "" {
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Default: 0
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KeyVer: 4009
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KeyTime: *120 {
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a: 0,1539538600,3079077200,4618615800,6158154400,7697693000,9237231600,10776770200,12316308800,13855847400,15395386000,16934924600,18474463200,20014001800,21553540400,23093079000,24632617600,26172156200,27711694800,29251233400,30790772000,32330310600,33869849200,35409387800,36948926400,38488465000,40028003600,41567542200,43107080800,44646619400,46186158000,47725696600,49265235200,50804773800,52344312400,53883851000,55423389600,56962928200,58502466800,60042005400,61581544000,63121082600,64660621200,66200159800,67739698400,69279237000,70818775600,72358314200,73897852800,75437391400,76976930000,78516468600,80056007200,81595545800,83135084400,84674623000,86214161600,87753700200,89293238800,90832777400,92372316000,93911854600,95451393200,96990931800,98530470400,100070009000,101609547600,103149086200,104688624800,106228163400,107767702000,109307240600,110846779200,112386317800,113925856400,115465395000,117004933600,118544472200,120084010800,121623549400,123163088000,124702626600,126242165200,127781703800,129321242400,130860781000,132400319600,133939858200,135479396800,137018935400,138558474000,140098012600,141637551200,143177089800,144716628400,146256167000,147795705600,149335244200,150874782800,152414321400,153953860000,155493398600,157032937200,158572475800,160112014400,161651553000,163191091600,164730630200,166270168800,167809707400,169349246000,170888784600,172428323200,173967861800,175507400400,177046939000,178586477600,180126016200,181665554800,183205093400
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}
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KeyValueFloat: *120 {
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a: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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}
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;KeyAttrFlags: Cubic|TangeantAuto|GenericTimeIndependent, Constant|ConstantStandard
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KeyAttrFlags: *2 {
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a: 8456,8194
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}
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;KeyAttrDataFloat: RightAuto:0, NextLeftAuto:0; RightSlope:0, NextLeftSlope:0, RightWeight:0.333333, NextLeftWeight:0.333333, RightVelocity:0, NextLeftVelocity:0
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KeyAttrDataFloat: *8 {
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a: 0,0,218434821,0,0,0,218434821,0
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}
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KeyAttrRefCount: *2 {
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a: 119,1
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}
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}
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```
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添加动画关键帧的方式
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```c++
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FbxAnimCurve* lCurve = lRoot->LclRotation.GetCurve(lAnimLayer, FBXSDK_CURVENODE_COMPONENT_Z, true);
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if (lCurve)
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{
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lCurve->KeyModifyBegin();
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lTime.SetSecondDouble(0.0);
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//添加时间
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lKeyIndex = lCurve->KeyAdd(lTime);
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//添加数值与插值模式
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lCurve->KeySetValue(lKeyIndex, 0.0);
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lCurve->KeySetInterpolation(lKeyIndex, FbxAnimCurveDef::eInterpolationCubic);
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lTime.SetSecondDouble(1.0);
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lKeyIndex = lCurve->KeyAdd(lTime);
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lCurve->KeySetValue(lKeyIndex, 45.0);
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lCurve->KeySetInterpolation(lKeyIndex, FbxAnimCurveDef::eInterpolationCubic);
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lTime.SetSecondDouble(2.0);
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lKeyIndex = lCurve->KeyAdd(lTime);
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lCurve->KeySetValue(lKeyIndex, -45.0);
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lCurve->KeySetInterpolation(lKeyIndex, FbxAnimCurveDef::eInterpolationCubic);
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lTime.SetSecondDouble(3.0);
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lKeyIndex = lCurve->KeyAdd(lTime);
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lCurve->KeySetValue(lKeyIndex, 0.0);
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lCurve->KeySetInterpolation(lKeyIndex, FbxAnimCurveDef::eInterpolationCubic);
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lCurve->KeyModifyEnd();
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}
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```
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### BindPose
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遍历所有节点，并对取得GlobalTransform矩阵，最后添加到Pose里。
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```c++
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// Now create a bind pose with the link list
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if (lClusteredFbxNodes.GetCount())
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{
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// A pose must be named. Arbitrarily use the name of the patch node.
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FbxPose* lPose = FbxPose::Create(pScene,pPatch->GetName());
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// default pose type is rest pose, so we need to set the type as bind pose
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lPose->SetIsBindPose(true);
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for (i=0; i<lClusteredFbxNodes.GetCount(); i++)
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{
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FbxNode* lKFbxNode = lClusteredFbxNodes.GetAt(i);
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FbxMatrix lBindMatrix = lKFbxNode->EvaluateGlobalTransform();
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lPose->Add(lKFbxNode, lBindMatrix);
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}
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// Add the pose to the scene
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pScene->AddPose(lPose);
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}
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```
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### ResetPose
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```c++
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void StoreRestPose(FbxScene* pScene, FbxNode* pSkeletonRoot)
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{
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// This example show an arbitrary rest pose assignment.
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// This rest pose will set the bone rotation to the same value
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// as time 1 second in the first stack of animation, but the
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// position of the bone will be set elsewhere in the scene.
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FbxString lNodeName;
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FbxNode* lKFbxNode;
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FbxMatrix lTransformMatrix;
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FbxVector4 lT,lR,lS(1.0, 1.0, 1.0);
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// Create the rest pose
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FbxPose* lPose = FbxPose::Create(pScene,"A Bind Pose");
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// Set the skeleton root node to the global position (10, 10, 10)
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// and global rotation of 45deg along the Z axis.
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lT.Set(10.0, 10.0, 10.0);
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lR.Set( 0.0, 0.0, 45.0);
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lTransformMatrix.SetTRS(lT, lR, lS);
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// 添加Root骨骼矩阵到Pose中
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lKFbxNode = pSkeletonRoot;
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lPose->Add(lKFbxNode, lTransformMatrix, false /*GlobalMatrix*/);
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// Set the lLimbNode1 node to the local position of (0, 40, 0)
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// and local rotation of -90deg along the Z axis. This show that
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// you can mix local and global coordinates in a rest pose.
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lT.Set(0.0, 40.0, 0.0);
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lR.Set(0.0, 0.0, -90.0);
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lTransformMatrix.SetTRS(lT, lR, lS);
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// 添加第二个骨骼节点到Pose中
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lKFbxNode = lKFbxNode->GetChild(0);
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lPose->Add(lKFbxNode, lTransformMatrix, true /*LocalMatrix*/);
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// Set the lLimbNode2 node to the local position of (0, 40, 0)
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// and local rotation of 45deg along the Z axis.
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lT.Set(0.0, 40.0, 0.0);
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lR.Set(0.0, 0.0, 45.0);
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lTransformMatrix.SetTRS(lT, lR, lS);
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// Add the skeleton second node to the pose
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lKFbxNode = lKFbxNode->GetChild(0);
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lNodeName = lKFbxNode->GetName();
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lPose->Add(lKFbxNode, lTransformMatrix, true /*LocalMatrix*/);
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// Now add the pose to the scene
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pScene->AddPose(lPose);
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}
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```
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## GlobalSettings
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场景的轴系统、系统单位、环境照明和时间设置可以通过`FbxScene::GetGlobalSettings()`获取FbxGlobalSettings来进行定义。 |