StructuralGeneralCrossSection Class

public sealed class StructuralGeneralCrossSection : StructuralCrossSection, 
	IEquatable<StructuralGeneralCrossSection>, IStructuralCrossSectionWithProfile, IStructuralCrossSectionWithDefinition

/// <summary>
/// Create general cross sections, specifying the shape of the cross section by using polygons
/// </summary>
/// <param name="materials">The available materials from the model</param>
/// <returns>A collection of general cross sections</returns>
private IReadOnlyCollection<StructuralCrossSection> CreateGeneralCrossSections(
    IReadOnlyDictionary<string, StructuralMaterial> materials)
{
    StructuralMaterial mat2 = materials["MAT2"];

    return new StructuralCrossSection[]
    {
        new StructuralGeneralCrossSection(Guid.NewGuid(), "CS29", mat2, new CompositeProfileDefinition("general1", new PolygonDefinition[]
        {
            new PolygonDefinition(mat2, new []
            {
                new Point2D(Length.FromCentimeters(20), Length.FromCentimeters(20)),
                new Point2D(Length.Zero, Length.FromCentimeters(20)),
                new Point2D(Length.Zero, Length.Zero),
                new Point2D(Length.FromCentimeters(20), Length.Zero)
            })
        }))
    };
}