[vtkusers] vtkXMLWriterC_SetCellsWithTypes: vtkIdType cellsSize ?

[fred]

Hi all,

I don't understand the meaning of the vtkIdType cellsSize argument in 
vtkXMLWriterC_SetCellsWithTypes:

/**
 * Set a cell array on the data object to be written.  Each cell can
 * have its own type.
 *
 * The cellTypes array specifies the type of each cell, and has ncells
 * entries.  The cells array must have cellsSize entries.  Each cell
 * uses N+1 entries where N is the number of points in the cell.  The
 * layout of the array for each cell is "[N,id1,id2,...,idN]".  The
 * total number of cells must be ncells.
 *
 * This may only be used for unstructured grid data objects.  It may
 * not be called before SetDataObjectType or between Start and Stop
 * calls.
 */
VTK_XML_EXPORT
void vtkXMLWriterC_SetCellsWithTypes(vtkXMLWriterC* self,
                                     int* cellTypes, vtkIdType ncells,
                                     vtkIdType* cells, vtkIdType cellsSize);

If I have several cells type, (VTK_HEXAHEDRON, VTK_QUAD, VTK_VERTEX),
how can I set cellsSize (ie one integer, not a pointer) ?
To which int value ? vtkHexahedron().GetNumberOfPoints() ?
vtkQuad().GetNumberOfPoints() ? vtkVertex().GetNumberOfPoints() ?
(ok, these are python methods, don't know if they exist in C, but the idea is here).

Could someone give me some light, please ?

Thanks in advance.

Cheers,
-- 
/F