[vtkusers] Delete vtk objects

[Julian Ibarz]

I think to have the same problem. I have a memory leak on only one program
and it contains VTK objects created in multiple threads. But I don't know
how to fix that sorry... If anyone has the solution...

2008/8/12 Andreas Brüning <mail-andi at web.de>

> Hello everyone,
>
> regarding to my post from beginning of august:
>
> http://www.vtk.org/pipermail/vtkusers/2008-August/096309.html
>
> i recompiled vtk with VTK_DEBUG_LEAKS flag in CMAKE and with use of
> vtkDebugLeaks i printed out the undeleted vtkobjects right before i close
> the program . I found out that if i create vtk objects in different threads
> the delete funtionality doesnŽt work anymore. When i only create vtkobjects
> in the mainThread they delete completely. But when i create different
> threads and in there new vtkObjects, dozens of vtkobjects remain in the
> memory.Even those i never created by myself.  I call always the New() and
> Delete() methods for every vtkobject in the thread. And it happens with all
> kinds of vtkobjects.
>
> Here is an example of a thread-method:
>
>  UINT __cdecl CImageVtkWnd::ResultView_2dMPR(LPVOID lpParameter )
>  {
>
>        //managing class of the threads
>         CImageVtkWnd *pThis = static_cast<CImageVtkWnd *>(lpParameter);
>
>        ASSERT(pThis != NULL);
>
>
>        // Create the the renderer, window and interactor objects.
>        vtkRenderer *vtk_Renderer = vtkRenderer::New();
>
>        vtkWin32OpenGLRenderWindow *vtk_Win32OpenGLWindow =
> vtkWin32OpenGLRenderWindow::New();
>        vtk_Win32OpenGLWindow->AddRenderer(vtk_Renderer);
>
>        double *spacing = pThis->m_vtkvolumedata->GetSpacing();
>        vtkImageShiftScale *vtk_scale = vtkImageShiftScale::New();
>
>        vtk_scale->SetInput(pThis->m_vtkvolumedata);
>        vtk_scale->SetShift(0.5*pThis->m_dWindow - pThis->m_dLevel);
>        vtk_scale->SetScale(255.0/pThis->m_dWindow);
>        vtk_scale->ClampOverflowOn();
>        vtk_scale->SetOutputScalarTypeToUnsignedChar();
>
>        vtkImageReslice *vtkImageReslicer = vtkImageReslice::New();
>        vtkImageReslicer->SetInput(vtk_scale->GetOutput());
>        vtkImageReslicer->SetOutputDimensionality(2);
>        vtkImageReslicer->SetInterpolationModeToLinear();
>
>        vtkImageReslicer->SetOutputSpacing(spacing);
>        vtkImageReslicer->ReleaseDataFlagOn();
>
>        vtkImageActor *vtk_actor = vtkImageActor::New();
>        vtk_actor->SetInput(vtkImageReslicer->GetOutput());
>
>        vtkTransform *vtk_slicetransform        = vtkTransform::New();
>
>        vtk_Renderer->AddActor(vtk_actor);
>        vtk_Renderer->ResetCamera();
>        vtk_Renderer->GetActiveCamera()->ParallelProjectionOn();
>
>        DWORD MultiLockObj = 0;
>
>        CSyncObject* pWaitObjects[] = { pThis->m_hRenderEvent,
> pThis->m_hTerminateLoopEvent, pThis->m_hResizeEvent };
>
>        CMultiLock MultiLock( pWaitObjects, 3L );
>
>        vtk_slicetransform->Translate(pThis->m_pSliceCenter[0],
> pThis->m_pSliceCenter[1], pThis->m_pSliceCenter[2]);
>        vtk_slicetransform->RotateZ(-pThis->m_dSliceAngle_z);
>        vtk_slicetransform->RotateX(-pThis->m_dSliceAngle_x);
>        vtk_slicetransform->RotateY(-pThis->m_dSliceAngle_y);
>
>        CSize *size = new CSize(600,800);
>
>        unsigned char *tmpdata;
>
>        BITMAPINFO bmi={0};
>        bmi.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
>        bmi.bmiHeader.biPlanes=1;
>        bmi.bmiHeader.biCompression=BI_RGB;
>        bmi.bmiHeader.biBitCount=24;
>        bmi.bmiHeader.biWidth=size->cx;
>        bmi.bmiHeader.biHeight=size->cy;
>        bmi.bmiHeader.biSizeImage=size->cx * size->cy * 24;
>
>        vtk_Win32OpenGLWindow->SetSize(size->cx,size->cy);
>        vtk_Win32OpenGLWindow->OffScreenRenderingOn();
>
>        do
>        {
>                if(MultiLockObj == (WAIT_OBJECT_0+1))
>                {
>                        break;
>                }
>
>                //reslice
>                if(MultiLockObj == (WAIT_OBJECT_0+2))
>                {
>                        vtk_slicetransform->Identity();
>
>  vtk_slicetransform->Translate(pThis->m_pSliceCenter[0],
> pThis->m_pSliceCenter[1], pThis->m_pSliceCenter[2]);
>
>
>  vtk_slicetransform->RotateZ(-pThis->m_dSliceAngle_z);
>
>  vtk_slicetransform->RotateX(-pThis->m_dSliceAngle_x);
>
>  vtk_slicetransform->RotateY(-pThis->m_dSliceAngle_y);
>
>
>  vtkImageReslicer->SetResliceAxes(vtk_slicetransform->GetMatrix());
>                }
>                vtk_Win32OpenGLWindow->Render();
>
>                vtk_Renderer->ResetCamera();
>                ::EnterCriticalSection(&pThis->m_cs);
>                tmpdata =
> vtk_Win32OpenGLWindow->GetPixelData(0,0,size->cx-1, size->cy,1);
>
>                pThis->m_lbitmap->ConvertFromDIB(&bmi,(L_UCHAR *)
> tmpdata);
>
>  pThis->m_lbitmap->SetXResolution(pThis->m_iSource_resolution);
>
>  pThis->m_lbitmap->SetYResolution(pThis->m_iSource_resolution);
>                pThis->m_lbitmap->CalculateXYRes();
>                pThis->m_lbitmap->GrayScale(pThis->m_iGrayscale);
>
>                LeaveCriticalSection(&pThis->m_cs);
>
>
>
>  ::PostMessage(pThis->m_cParent->GetSafeHwnd(),WM_VTK_UPDATE_WINDOW,1,NULL);
>
>
>                delete tmpdata;
>
>
>                MultiLockObj = MultiLock.Lock( INFINITE, FALSE );
>        }
>        while(1);
>
>        //Cleanup
>        delete size;
>
>
>        vtk_Renderer->Delete();
>        vtk_Win32OpenGLWindow->Delete();
>        vtk_scale->Delete();
>        vtkImageReslicer->Delete();
>        vtk_actor->Delete();
>        vtk_slicetransform->Delete();
>
>        ::AfxEndThread( 0, true );
>        return 0L;
>
>  }
>
>
>
>
> Does anybody has an idea why i cant delete vtk objects in a thread? i tried
> already to cut the connections between vtkobjects in the different threads,
> but it also doesnŽt helped.
>
> Thanks in advance
> Andi
>
>
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-- 
Julian Ibarz
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