[vtkusers] how to access the vericies of a polyData

[LM]

hi all
  I try to access each cell in some polyData and the access the x,y,z of the vertecies of the triangle 
but I tried a lot to read these vertecies and failed.., so i ask u if u know how to do..
   
  some of my trials:
   
          vtkCell *cell;
 vtkPoints *points;
 vtkDataArray *pointsArray;
  for (int ID=0;ID<poly->GetNumberOfCells();ID++)
 {
  
  cell=poly->GetCell(ID);
  points->Initialize();
  points=cell->GetPoints();
  pointsArray=points->GetData();
   
 }//for cells
  
but the pointsArray (vtkDataArray) don't contain the x,y,z of the points..:(
  do u have any idea??????????????????????
   
   
  thanks in advance
   
  LM

 		
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