One point to note is that the source can either be point or cell data. If the source is cell data, a conversion to point data may or may not be required, in order for the object to be rendered correctly. If a conversion is needed, the 'cell_to_point' flag (see below) must be set to 'True', otherwise to 'False' (which is the default). On occasions, an inaccurate object may be rendered from cell data even after conversion.