[vtkusers] a surprise questuion about show some clouds!

[seaer]

 hi David, 
  
   // here are some code   
//____________________________________________________________________________
    openFileNames = QFileDialog::getOpenFileNames(this,tr("open
files"),"/home/xiushan08");
 
    QFile openfile(openFileNames);

     vtkIdType vtkPointCount = 0;


     if(openfile.open(QFile::ReadOnly|QFile::Text))
     {
         QTextStream inn(&openfile);
         QString line;
         double x=0;
         double y=0;
         double z=0;

         while(!inn.atEnd())
         {
            line = inn.readLine();
            QStringList list = line.split(' ');
            x = list.takeFirst().toDouble();
            y = list.takeFirst().toDouble();
            z = list.takeFirst().toDouble();
            vtkpoints->InsertPoint(vtkPointCount++,x,y,z);
         }
 
     }
     openfile.close();
     
     pdata->SetPoints(vtkpoints); 


     int num = pdata->GetNumberOfPoints();
     std::cout<<"pointsNums:"<<num <<std::endl;
     cell->InsertNextCell(num); //cell is vtkCellArray*

     for(int i = 0;i < num; i++)
        {
            cell->InsertCellPoint(i);
        }

      pdata->SetVerts(cell);   // pdata  is vtkPolyData*

  

         mapper->SetInput(pdata);
         actor->SetMapper(mapper);
         actor->GetProperty()->SetPointSize(20);
         ren->AddViewProp(actor);
         ren->ResetCamera();
         ren->SetBackground(0.1, 0.2, 0.4 );
         QVTKWt->GetRenderWindow()->Render();
        double xyz[3];
         for(int i =0;i< vtkpoints->GetNumberOfPoints();i++)
         {
             vtkpoints->GetPoint(i,xyz);
             std::cout <<std::setprecision(10)&lt;&lt;xyz[0]&lt;&lt; &quot; 
&quot;&lt;&lt;xyz[1]&lt;&lt; &quot;  &quot;&lt;&lt;xyz[2]&lt;&lt; std::endl;

         }

//____________________________________________________________________________
  According to these codes,  it can show points cloud in QVTKWidget.

  for aa.txt , the following debug news:
   pointsNums:5
   1.021  1.548  93.725
   1.011  1.555  93.735
   1.023  1.588  93.711
   1.009  1.591  93.726
   1.001  1.601  93.732
  
  for bb.txt, the following debug news:
   
   pointsNums:5
   607645.021  3623761.548  93.725
   607645.011  3623761.555  93.735
   607645.023  3623761.588  93.711
   607645.009  3623761.591  93.726
   607645.001  3623761.601  93.732
   

  that's all right.
    for aa.txt input, you can zoom in/zoom out viewPort and see five 5
points in viewPort,  but for bb.txt,  you can also zoom in/zoom out
viewPort, but see only a point in viewPort. generally, by the mean of using
ren->ResetCamera(), you can see all points in viewPort, but for bb.txt, it
can no t do it .whether bb.txt data 's very big basic number, for example ,    
607645.021  3623761.548  93.725;  607645.011  3623761.555  93.735 .these
point's  basic number is  607645,  whether these can affect do good!


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