[vtkusers] vtkPolyData and SetPoints

[Pan Ross]

I want  to display a point clouds and write the following codes:
  vtkPoints * points = vtkPoints::New();
  float x,y,z;
  while( !feof(file) )
  {
   fscanf(file,"%f\t%f\t%f\n",&x, &y, &z);
   points->InsertNextPoint(x,y,z);
  }
  fclose(file);
  vtkPolyData  * polydata = vtkPolyData::New();
  polydata->SetPoints(points);
  
  vtkPolyDataMapper *mapper = vtkPolyDataMapper::New();
  mapper->SetInput(polydata);
  vtkActor *actor  = vtkActor::New();
  actor->SetMapper(mapper);
  this->Props->AddItem(actor);
  
But there is nothing in the window. Who can tell I why I cannot get the result.
 
Thanks

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