242 lines
8.8 KiB
Markdown
242 lines
8.8 KiB
Markdown
---
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title: Qt & FBX相关笔记
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date: 2023-11-06 11:45:14
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excerpt:
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tags:
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rating: ⭐
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---
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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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```c++
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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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新版本fbxsdk需要自己link xml2库，所以需要手动安装一下
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```bash
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sudo apt-get install libxml2-dev
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sudo apt-get install libxml2
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```
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之后再qt的pro中添加`LIBS += -lxml2`即可。
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之后运行程序会提示# (error while loading shared libraries: libfbxsdk.so: cannot open shared object file: No)
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这是因为Linux的动态链接库寻找方式与windows不同所致，我们需要添加lib搜索路径：
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使用VSCode打开/etc/ld.so.conf ，输入libfbxsdk.so的路径，再运行ldconfig，即可解决问题
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```
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1> vim /etc/ld.so.conf //在新的一行中加入库文件所在目录
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2> /usr/lib //添加的目录路径
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3> /usr/local/lib //添加的目录路径
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3> ldconfig //更新/etc/ld.so.cache文件
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```
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参考
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https://blog.csdn.net/sinat_14854721/article/details/111191139
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另一种思路就是使用linuxdeployqt，打成类似MAC的APP包
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- https://github.com/probonopd/linuxdeployqt
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- https://blog.csdn.net/zyhse/article/details/106381937
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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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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。
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## FBXStream & 共享内存
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FBXStream案例:https://github.com/hamedsabri/FbxStream
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之前考虑通过共享内存来实现文件传递以此来规避IO瓶颈，这里可以考虑参考FBXStream。本质是通过文字流使得 文件 <=> string。
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这样就可以通过共享内存进行数据传递了。
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让张柏林试试对一个文件使用Java进行字符串流化。
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文档地址：
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- https://help.autodesk.com/view/FBX/2020/ENU/?guid=FBX_Developer_Help_cpp_ref_class_fbx_stream_html
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- https://help.autodesk.com/view/FBX/2020/ENU/?guid=FBX_Developer_Help_cpp_ref_class_fbx_importer_html |