/// <summary>
/// Evaluate the local coordinate system of this surface.
/// By convention, the z-axis of the local coordinate system will point normal to the
/// surafce and the x-axis will be orientated as closely as possible to global X, unless
/// the x-axis lies within a certain angular limit of z, in which case the global Y axis
/// will be used instead.
/// </summary>
/// <param name="orientation">The orientation angle. The rotation of the X and Y axes of the coordinate
/// system around the Z axis, relative to default reference orientation.</param>
/// <returns></returns>
public CartesianCoordinateSystem LocalCoordinateSystem(Angle orientation)
{
return(LocalCoordinateSystem(0, 0.5, 0.5, orientation, Angle.FromDegrees(1)));
}
/// <summary>
/// Evaluate the local coordinate system of this surface.
/// By convention, the z-axis of the local coordinate system will point normal to the
/// surafce and the x-axis will be orientated as closely as possible to global X, unless
/// the x-axis lies within a certain angular limit of z, in which case the global Y axis
/// will be used instead.
/// </summary>
/// <param name="i">The index of the face on which to evaluate the local coordinate system</param>
/// <param name="u">A normalised parameter defining the first coordinate of a point on this surface.
/// Note that parameter-space is not necessarily uniform and does not equate to a normalised length.
/// 0 = span start, 1 = span end.</param>
/// /// <param name="v">A normalised parameter defining the first coordinate of a point on this surface.
/// Note that parameter-space is not necessarily uniform and does not equate to a normalised length.
/// 0 = span start, 1 = span end.</param>
/// <param name="orientation">The orientation angle. The rotation of the X and Y axes of the coordinate
/// system around the Z axis, relative to default reference orientation.</param>
/// <returns></returns>
public CartesianCoordinateSystem LocalCoordinateSystem(int i, double u, double v, Angle orientation)
{
return(LocalCoordinateSystem(i, u, v, orientation, Angle.FromDegrees(1)));
}
