/// <summary>
/// Gets the transformation matrix from the World Coordinate System (WCS)
/// to the specified model space viewport Display Coordinate System (DCS).
/// </summary>
/// <param name="vp">The instance to which this method applies.</param>
/// <returns>The WCS to DCS transformation matrix.</returns>
public static Matrix3d WCS2DCS(this Viewport vp)
{
return(vp.DCS2WCS().Inverse());
}