https://learn.microsoft.com/en-us/dotnet/api/system.windows.media.animation.rotation3dkeyframecollection.createinstancecore?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
Rotation3DKeyFrameCollection.CreateInstanceCore Method (System.Windows.Media.Animation) | Microsoft...
Creates a new, frozen instance of Rotation3DKeyFrameCollection.
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