[vtkusers] Does the order of using Delete() matter

[Amy Henderson]

Don't call Delete for points, polys, or iso.  Since you did not create them 
by calling New, don't call Delete on them either.

- Amy

At 11:16 AM 11/21/2001 -0800, Weiguang Guan wrote:
>Hi all,
>
>I have a volume go through vtkContourFilter then get suface data back.
>Core dump happens when using Delete() to free resources. Does
>anyone know what causes it. Here is the code segment:
>         .........
>         vtkStructuredPoints *vtk_str_pnt;
>         vtk_str_pnt= vtkStructuredPoints::New();
>
>         vtk_str_pnt->SetOrigin((float)origin[0], (float)origin[1],
>                                (float)origin[2]);
>         vtk_str_pnt->SetDimensions(dimensions);
>         vtk_str_pnt->SetSpacing((float)spacings[0], (float)spacings[1],
>                                 (float)origin[2]);
>         vtkScalars *scalars;
>         scalars= vtkScalars::New();
>         vtk_str_pnt->GetPointData()->SetScalars(scalars);
>         scalars->SetDataTypeToChar();
>
>         // feed data in
>         scalars->Allocate(dimensions[0]*dimensions[1]*dimensions[2]);
>         for (i= 0; i< dimensions[0]*dimensions[1]*dimensions[2]; i++) {
>             s= *(((char*) buf) + i);
>             scalars->InsertScalar(i, s);
>         }
>
>         vtkContourFilter *iso_gen;
>         iso_gen= vtkContourFilter::New();
>         iso_gen->SetInput(vtk_str_pnt);
>         iso_gen->SetValue(0, iso_value);
>         iso_gen->Update();
>
>         vtkPolyData *iso;
>         iso= iso_gen->GetOutput();      /* Surface data is in iso */
>
>         vtkCellArray *polys;
>         polys= iso->GetPolys();
>         vtkPoints *points;
>         points= iso->GetPoints();
>         ..........
>
>         scalars->Delete();
>         vtk_str_pnt->Delete();
>         iso_gen->Delete();
>         points->Delete();
>         polys->Delete();
>         iso->Delete();
>
>Weiguang
>
>--
>Weiguang Guan, Schrodinger Inc | Email: weiguang at schrodinger.com
>Tel: 503-299-1150 ext. 128 (O)
>
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