https://learn.microsoft.com/en-us/dotnet/api/system.windows.media.animation.rotation3danimationusingkeyframes.keyframes?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
Rotation3DAnimationUsingKeyFrames.KeyFrames Property (System.Windows.Media.Animation) | Microsoft...
Gets or sets the collection of Rotation3DKeyFrame objects that define the animation.
property systemwindows mediakeyframesanimationmicrosoft