I am looking for a C# third party library that can rotate polylines. I have a series of 3d Vectors ( that make up a polyline) and I wish to rotate them around a given point. I am also looking for a library that can interpolate/lerp 2 3d Vectors.

Do you know of any third party libraries that can do this?

I've attempted to use the standard System.Windows.Shapes.Polyline and System.Windows.Media.RotateTransform but it looks like the rotation is only applied at rendering time (correct me if I am wrong). I need to know the location of the rotated point right after I apply the System.Windows.Media.RotateTransform.

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