It probably means that the object has no references holding on to it and is hence destroyed by the GC. Try expanding its scope outside the function.<div><br></div><div><br><div class="gmail_quote">On Sun, Sep 12, 2010 at 3:40 PM, Ali Habib <span dir="ltr"><<a href="mailto:ali.mahmoud.habib@gmail.com">ali.mahmoud.habib@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div dir="ltr">Hi,<div>I created my own pipeline to select part of <b>vtkboxwidget </b>and linear transfer it , as a source of linear deformation but the code through error : trying to delete object with non zero reference count at vtkobject.cxx</div>
<div><br></div><div>any suggestion to solve that , the code I use is :</div><div><div> static vtkPolyData gpd;</div><div> static vtkLODActor selectActor;</div><div> static vtkLODActor maceActor;</div>
<div> static vtkLODActor selectActor_cutting;</div><div> static vtkPlanes planes;</div><div> static vtkClipPolyData clipper;</div><div> static vtkClipPolyData clipper_cutting;</div><div> // static vtkAppendPolyData apd;</div>
<div><br></div><div> static double[] center_Before = new double[3];</div><div> static double[] center_After = new double[3];</div><div><br></div><div> bool IsTransfer = false;</div></div><div><br></div>
<div><div>void AddInputToWindow(vtk.vtkRenderWindow renWin, bool ISFirst)</div><div> {</div><div> /* vtk.vtkSphereSource cone = new vtk.vtkSphereSource();</div><div> cone.SetRadius(1.0f);*/</div>
<div><br></div><div> vtk.vtkDICOMImageReader VDR = new vtk.vtkDICOMImageReader();</div><div> VDR.SetDirectoryName(@"E:\Master Degree\DataSet\case2\DICOM\PA1\ST1\SE2");</div><div> VDR.SetDataOrigin(0, 0, 0);</div>
<div> VDR.Update();</div><div><br></div><div> // decrease the dataset data for large data preprocessing </div><div><br></div><div> vtkImageShrink3D VIS = new vtkImageShrink3D();</div><div>
VIS.SetShrinkFactors(2, 2, 2);</div><div> VIS.SetInputConnection(VDR.GetOutputPort());</div><div> VIS.Update();</div><div><br></div><div> vtkImageThreshold VIT = new vtkImageThreshold();</div>
<div> VIT.ThresholdBetween(200, 2000);</div><div> VIT.SetInputConnection(VIS.GetOutputPort());</div><div> VIT.Update();</div><div><br></div><div> ///// Start the creation of volume rendering </div>
<div><br></div><div> //1. Gget the range of data </div><div> vtk.vtkImageChangeInformation VIC = new vtk.vtkImageChangeInformation();</div><div> VIC.SetInput(VDR.GetOutput());</div><div> VIC.CenterImageOn();</div>
<div> VIC.Update();</div><div><br></div><div> vtk.vtkImageData VoxelData = new vtk.vtkImageData();</div><div> VoxelData = VIC.GetOutput();</div><div><br></div><div> double[] metaScalarRange = VoxelData.GetScalarRange();</div>
<div><br></div><div><br></div><div> // Render the skin - Soft tissue </div><div> double isovalue = 0.8 * (metaScalarRange[1] + metaScalarRange[0]);</div><div><br></div><div><br></div><div> vtkContourFilter skinExtractor = new vtkContourFilter();</div>
<div> skinExtractor.SetInputConnection(VIT.GetOutputPort());</div><div> skinExtractor.SetValue(0, isovalue);</div><div> skinExtractor.ComputeGradientsOn();</div><div> skinExtractor.Update();</div>
<div><br></div><div> vtkPolyDataConnectivityFilter VPDC = new vtkPolyDataConnectivityFilter();</div><div> VPDC.SetInput(skinExtractor.GetOutput());</div><div> VPDC.SetExtractionModeToLargestRegion();</div>
<div> VPDC.Update();</div><div><br></div><div> gpd = VPDC.GetOutput();</div><div><br></div><div> /*gpd.Register(null);</div><div> gpd.SetSource(null);*/</div><div><br></div><div>
vtk.vtkPolyDataMapper coneMapper = new vtk.vtkPolyDataMapper();</div><div> coneMapper.SetInput(gpd);</div><div> coneMapper.ScalarVisibilityOff();</div><div><br></div><div> maceActor = new vtkLODActor();</div>
<div> maceActor.SetMapper(coneMapper);</div><div> maceActor.GetProperty().SetColor(1, 0, 0);</div><div> //////////////////////// Selection Part /////////////////////////</div><div> planes = new vtkPlanes();</div>
<div><br></div><div> clipper = new vtkClipPolyData();</div><div> clipper.SetInput(gpd);</div><div> clipper.SetClipFunction(planes);</div><div> clipper.InsideOutOn();</div><div>
clipper.Modified();</div>
<div> vtkPolyDataMapper selectMapper = new vtkPolyDataMapper();</div><div> selectMapper.SetInput(clipper.GetOutput());</div><div> selectMapper.ScalarVisibilityOff();</div><div><br></div><div>
selectActor = new vtkLODActor();</div><div> selectActor.SetMapper(selectMapper);</div><div> selectActor.GetProperty().SetColor(0, 1, 0);</div><div> selectActor.VisibilityOff();</div>
<div> selectActor.SetScale(1.01, 1.01, 1.01);</div><div><br></div><div> /////////////////////// End of selection part////////////////////</div><div><br></div><div> //////////////////////////// Cutting part /////////////////////////////////</div>
<div><br></div><div><br></div><div> clipper_cutting = new vtkClipPolyData();</div><div> clipper_cutting.SetInput(gpd);</div><div> clipper_cutting.SetClipFunction(planes);</div><div> clipper_cutting.InsideOutOff();</div>
<div> clipper_cutting.GenerateClippedOutputOff();</div><div> clipper_cutting.Modified();</div><div> vtkPolyDataMapper selectMapper_cutting = new vtkPolyDataMapper();</div><div> selectMapper_cutting.SetInput(clipper_cutting.GetOutput());</div>
<div> selectMapper_cutting.ScalarVisibilityOff();</div><div><br></div><div> selectActor_cutting = new vtkLODActor();</div><div> selectActor_cutting.SetMapper(selectMapper_cutting);</div><div>
selectActor_cutting.GetProperty().SetColor(1, 0, 0);</div><div> selectActor_cutting.VisibilityOff();</div><div> selectActor_cutting.SetScale(1.01, 1.01, 1.01);</div><div><br></div><div> //////////////////////////// End Cutting part //////////////////////////////////////</div>
<div> vtk.vtkRenderer ren1 = new vtk.vtkRenderer();</div><div><br></div><div> renWin.AddRenderer(ren1);</div><div> //ren1.SetBackground(0.0f, 0.0f, 0.0f);</div><div><br></div><div> vtkRenderWindowInteractor iren = new vtkRenderWindowInteractor();</div>
<div> iren.SetRenderWindow(renWin);</div><div><br></div><div><br></div><div><br></div><div> //The SetInteractor method is how 3D widgets are associated with the</div><div> //render window interactor. Internally, SetInteractor sets up a bunch</div>
<div> //of callbacks using the Command/Observer mechanism (AddObserver()).</div><div> vtkBoxWidget boxWidget = new vtkBoxWidget();</div><div> boxWidget.SetInteractor(iren);</div><div> boxWidget.SetPlaceFactor(1.25);</div>
<div> boxWidget.TranslationEnabledOn();</div><div><br></div><div><br></div><div><br></div><div> ren1.AddActor(maceActor);</div><div> ren1.AddActor(selectActor);</div><div> ren1.AddActor(selectActor_cutting);</div>
<div><br></div><div> boxWidget.SetInput(gpd);</div><div> boxWidget.PlaceWidget();</div><div><br></div><div> boxWidget.AddObserver((uint)vtk.EventIds.StartInteractionEvent, new vtk.vtkDotNetCallback(StartInteractionEvent));</div>
<div> boxWidget.AddObserver((uint)vtk.EventIds.InteractionEvent, new vtk.vtkDotNetCallback(InteractionEvent));</div><div> boxWidget.AddObserver((uint)vtk.EventIds.EndInteractionEvent, new vtk.vtkDotNetCallback(EndInteractionEvent));</div>
<div><br></div><div><br></div><div> boxWidget.On();</div><div><br></div><div><br></div><div> renWin.AddRenderer(ren1);</div><div><br></div><div> GC.Collect();</div><div> }</div><div>
<br></div><div> ///////////////////////// Observation Events ///////////////////////////////////////////////////////////////////</div><div> ///////////////////////// Observation Events ///////////////////////////////////////////////////////////////////</div>
<div> public void StartInteractionEvent(vtk.vtkObject obj, uint eventId, Object data, IntPtr clientdata)</div><div> {</div><div> if (IsTransfer)</div><div> {</div><div> vtkBoxWidget widget = vtkBoxWidget.SafeDownCast(obj);</div>
<div><br></div><div> vtkPolyData before = new vtkPolyData();</div><div> widget.GetPolyData(before); double[] x = before.GetPoints().GetBounds();</div><div> center_Before = GetBoundsCenter(before.GetBounds());</div>
<div> }</div><div><br></div><div><br></div><div> }</div><div> public void InteractionEvent(vtk.vtkObject obj, uint eventId, Object data, IntPtr clientdata)</div><div> {</div><div> vtkBoxWidget widget = vtkBoxWidget.SafeDownCast(obj);</div>
<div> widget.GetPlanes(planes);</div><div><br></div><div> clipper.Modified();</div><div> clipper_cutting.Modified();</div><div><br></div><div> selectActor.VisibilityOn();</div>
<div>
selectActor_cutting.VisibilityOn();</div><div><br></div><div><br></div><div><br></div><div> }</div><div> public void EndInteractionEvent(vtk.vtkObject obj, uint eventId, Object data, IntPtr clientdata)</div>
<div> {</div><div> if (IsTransfer)</div><div> {</div><div> vtkBoxWidget widget = vtkBoxWidget.SafeDownCast(obj);</div><div> vtkPolyData after = new vtkPolyData();</div>
<div> widget.GetPolyData(after);</div><div> center_After = GetBoundsCenter(after.GetBounds());</div><div><br></div><div><br></div><div> ModifyData();</div><div> selectActor.VisibilityOff();</div>
<div> }</div><div><br></div><div><br></div><div> }</div><div> </div><div> private double[] GetBoundsCenter(double[] bounds)</div><div> {</div><div> double[] center = new double[3];</div>
<div><br></div><div> center[0] = (bounds[0] + bounds[1]) / 2.0;</div><div> center[1] = (bounds[2] + bounds[3]) / 2.0;</div><div> center[2] = (bounds[4] + bounds[5]) / 2.0;</div><div><br></div>
<div> return center;</div><div> }</div><div><br></div><div> private void ModifyData()</div><div> {</div><div> //////////////////////////////////////////////////////Just sugesstion ///////////////////////</div>
<div><br></div><div><br></div><div> double[] Displacement = { center_After[0] - center_Before[0], center_After[1] - center_Before[1], center_After[2] - center_Before[2] };</div><div><br></div><div> int NoOfPoints = clipper.GetOutput().GetNumberOfPoints();</div>
<div><br></div><div> for (int i = 0; i < NoOfPoints; i++)</div><div> {</div><div> // get the point data from the clipper</div><div> double[] ci = clipper.GetOutput().GetPoints().GetPoint(i);</div>
<div> // get the index of the original data point.</div><div> int pxi = gpd.FindPoint(ci);</div><div> // get the value of the poly data point.</div><div> double[] ppi = gpd.GetPoints().GetPoint(pxi);</div>
<div> // transpose the point</div><div> ppi[0] += Displacement[0];</div><div> ppi[1] += Displacement[1];</div><div> ppi[2] += Displacement[2];</div><div> // replace the point in the poly data</div>
<div> gpd.GetPoints().InsertPoint(pxi, ppi);</div><div> }</div><div> // mark the poly data as modified for the render processing.</div><div><br></div><div> </div><div> /*gpd.Register(null);</div>
<div> gpd.SetSource(null);*/</div><div><br></div><div> gpd.Modified();</div><div> GC.Collect();</div><div> }</div></div><div><br></div><div>Best regards</div><div><br></div></div>
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<br></blockquote></div><br></div>