/// <summary>
/// Creates a shape representation or appends existing ones to original representation.
/// </summary>
/// <remarks>
/// This function has two modes.
/// If originalShapeRepresentation has no value, then this function will create a new ShapeRepresentation handle.
/// If originalShapeRepresentation has a value, then it is expected to be an aggregation of representations, and the new representation
/// will be appended to the end of the list.
/// </remarks>
/// <param name="exporterIFC">The ExporterIFC object.</param>
/// <param name="categoryId">The category id.</param>
/// <param name="contextOfItems">The context for which the different subtypes of representation are valid.</param>
/// <param name="identifierOpt">The identifier for the representation.</param>
/// <param name="representationTypeOpt">The type handle for the representation.</param>
/// <param name="items">Collection of geometric representation items that are defined for this representation.</param>
/// <param name="originalShapeRepresentation">The original shape representation.</param>
/// <returns>The handle.</returns>
public static IFCAnyHandle CreateOrAppendShapeRepresentation(ExporterIFC exporterIFC, Element element, ElementId categoryId, IFCAnyHandle contextOfItems,
string identifierOpt, string representationTypeOpt, ISet <IFCAnyHandle> items, IFCAnyHandle originalShapeRepresentation)
{
if (!IFCAnyHandleUtil.IsNullOrHasNoValue(originalShapeRepresentation))
{
GeometryUtil.AddItemsToShape(originalShapeRepresentation, items);
return(originalShapeRepresentation);
}
return(CreateShapeRepresentation(exporterIFC, element, categoryId, contextOfItems, identifierOpt, representationTypeOpt, items));
}