/// <summary>
/// Get the other element of a <see cref="MeshFace"/>, when
/// looking from <paramref name="element"/>.
/// <para>
/// For boundary faces, null is returned.
/// </para>
/// </summary>
public static int OtherElement(this SMeshFace face, int element)
{
if (face.LeftElement == element)
{
return(face.RightElement);
}
if (face.RightElement == element)
{
return(face.LeftElement);
}
throw new Exception("element is not part of face");
}
/// <summary>
/// Returns true if the face is a boundary face.
/// </summary>
public static bool IsBoundaryFace(this SMeshFace face)
{
return(face.RightElement < 0);
}