/// <summary>
/// Gets metadata for a certain TF
/// </summary>
/// <param name="type">Metadata type interfacing ICurvyMetadata</param>
/// <param name="tf">TF value reflecting position on spline (0..1)</param>
/// <returns>the metadata</returns>
public override Component GetMetadata(System.Type type, float tf)
{
float localTF;
CurvySpline spl = TFToSpline(tf, out localTF);
return((spl) ? spl.GetMetadata(type, localTF) : null);
}