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03-UnrealEngine/Editor/FBXAnimation导入逻辑.md → 03-UnrealEngine/Editor/FBXAnimation导入&导出逻辑.md
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@ -112,3 +112,60 @@ UE5中FBXSDK相关函数调用方式：
1. Interchange\\Runtime\\Source\\Parsers
1. InterchangeFbxParser.Build.cs
2. FbxInclude.h：FBXSDK头文件包含问题。
# UE5中使用FBXSDK导出动画逻辑
1. FFbxExporter::ExportSkeletalMeshToFbx => FFbxExporter::ExportAnimSequence => FFbxExporter::ExportAnimSequenceToFbx
2. FFbxExporter::CorrectAnimTrackInterpolation
直接导出会有问题，所以UE在这里做了一步Correct：
```c++
// The curve code doesn't differentiate between angles and other data, so an interpolation from 179 to -179
// will cause the bone to rotate all the way around through 0 degrees. So here we make a second pass over the
// rotation tracks to convert the angles into a more interpolation-friendly format.
FFbxExporter::CorrectAnimTrackInterpolation()
{
void FFbxExporter::CorrectAnimTrackInterpolation( TArray<FbxNode*>& BoneNodes, FbxAnimLayer* InAnimLayer )
{
// Add the animation data to the bone nodes
for(int32 BoneIndex = 0; BoneIndex < BoneNodes.Num(); ++BoneIndex)
{
FbxNode* CurrentBoneNode = BoneNodes[BoneIndex];
// Fetch the AnimCurves
FbxAnimCurve* Curves[3];
Curves[0] = CurrentBoneNode->LclRotation.GetCurve(InAnimLayer, FBXSDK_CURVENODE_COMPONENT_X, true);
Curves[1] = CurrentBoneNode->LclRotation.GetCurve(InAnimLayer, FBXSDK_CURVENODE_COMPONENT_Y, true);
Curves[2] = CurrentBoneNode->LclRotation.GetCurve(InAnimLayer, FBXSDK_CURVENODE_COMPONENT_Z, true);
for(int32 CurveIndex = 0; CurveIndex < 3; ++CurveIndex)
{
FbxAnimCurve* CurrentCurve = Curves[CurveIndex];
CurrentCurve->KeyModifyBegin();
float CurrentAngleOffset = 0.f;
for(int32 KeyIndex = 1; KeyIndex < CurrentCurve->KeyGetCount(); ++KeyIndex)
{
float PreviousOutVal = CurrentCurve->KeyGetValue( KeyIndex-1 );
float CurrentOutVal = CurrentCurve->KeyGetValue( KeyIndex );
float DeltaAngle = (CurrentOutVal + CurrentAngleOffset) - PreviousOutVal;
if(DeltaAngle >= 180)
{
CurrentAngleOffset -= 360;
}
else if(DeltaAngle <= -180)
{
CurrentAngleOffset += 360;
}
CurrentOutVal += CurrentAngleOffset;
CurrentCurve->KeySetValue(KeyIndex, CurrentOutVal);
}
CurrentCurve->KeyModifyEnd();
}
}
}
```