[vtkusers] picking and glyphing

[Luke Hua]

Hi, how are you!
 
I used vtkPointPicker to pick points on the surface and used vtkglyph3D to store the picked point. However, after I picked 10-20 point, all the object on the render window disappeared. 
 
My snippet:
 
  if(this->pt_empty==0){
   pt_ID=sel_pt->InsertNextPoint(x);
   sel_pd->SetPoints(sel_pt);
   
   ptglyph->SetInput(sel_pd);
   ptglyph->SetSource(sel_sphere->GetOutput());
   
   ptglyphMapper->SetInput(ptglyph->GetOutput());
   ptglyphMapper->ScalarVisibilityOff();
   
   ptglyphActor->SetMapper(ptglyphMapper);
   ptglyphActor->GetProperty()->SetDiffuseColor(1, 0.0, 0.0);
   this->pt_empty=1;
  }else{
   pt_ID=sel_pt->InsertNextPoint(x);
   
   ptglyph->Modified();
   
  }
  this->renWin->Render();
 
Did I do something wrong?
 
                                                                                  Luke


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