[vtkusers] vtk pipeline problem

[Johnson]

Hi
This is the current pipeline, the actors doesn't appear in the render 
window
         
vtkSmartPointer<vtkImageThreshold>threshold=vtkSmartPointer<vtkImageThreshold>::New();; 


     threshold->SetOutValue(0);

     threshold->SetInput(brain3D);

     threshold->ReleaseDataFlagOn();

     vtkSmartPointer<vtkImageToStructuredPoints>  imgToStrPnts  =  vtkSmartPointer<vtkImageToStructuredPoints>::New();

     imgToStrPnts->SetInputConnection(threshold->GetOutputPort());

     imgToStrPnts->ReleaseDataFlagOn();

     //  create  an  isosurface,  note  that  vtkMarchingCubes  is  better  than

     //  vtkContourFilter

     vtkSmartPointer<vtkMarchingCubes>  mcubes  =  vtkSmartPointer<vtkMarchingCubes>::New();

     mcubes->SetInputConnection(imgToStrPnts->GetOutputPort());

     mcubes->ComputeNormalsOff();

     mcubes->ComputeGradientsOff();

     mcubes->ComputeScalarsOff();

     mcubes->ReleaseDataFlagOn();

     //  try  to  reduce  the  number  of  triangles

     vtkSmartPointer<vtkDecimatePro>  decimator  =  vtkSmartPointer<vtkDecimatePro>::New();

     decimator->SetInputConnection(mcubes->GetOutputPort());

     decimator->SetFeatureAngle(60);

     decimator->SetMaximumError(1);

     decimator->SplittingOff();

     decimator->PreserveTopologyOn();

     decimator->SetTargetReduction(0.5);

     decimator->ReleaseDataFlagOn();

     //  smooth  the  result  of  the  iso  vtkMarchingCubes

     vtkSmartPointer<vtkWindowedSincPolyDataFilter>  smoother  =  vtkSmartPointer<vtkWindowedSincPolyDataFilter>::New();

     smoother->SetInputConnection(decimator->GetOutputPort());

     smoother->SetNumberOfIterations(10);

     smoother->BoundarySmoothingOff();

     smoother->FeatureEdgeSmoothingOff();

     smoother->SetPassBand(0.1);

     smoother->ReleaseDataFlagOn();

     //  compute  normals  and  point  normals

     vtkSmartPointer<vtkPolyDataNormals>  normals  =  vtkSmartPointer<vtkPolyDataNormals>::New();

     normals->SetInputConnection(smoother->GetOutputPort());

     normals->ComputePointNormalsOn();

     normals->SetFeatureAngle(60);

     normals->SetSplitting(true);

     normals->ReleaseDataFlagOn();

     //  stripper:  create  triangle  out  of  polygons

     vtkSmartPointer<vtkStripper>  stripper  =  vtkSmartPointer<  vtkStripper  >::New();

     stripper->SetInputConnection(normals->GetOutputPort());

     stripper->GetOutput()->ReleaseDataFlagOn();

     //  map  smoothed  data

     vtkSmartPointer<vtkPolyDataMapper>  isoMapper  =  vtkSmartPointer<vtkPolyDataMapper>::New();

     isoMapper->SetInputConnection(stripper->GetOutputPort());

     isoMapper->ImmediateModeRenderingOn();

     isoMapper->ScalarVisibilityOff();    //  utilize  actor's  property  I  set

     //  render  isosurfaces

     for  (uint  i  =  0;i  <2;i++)  {  //lblValues.n_elem

         progress.setValue(i);

         qDebug()<<"processing  "<<i;

         //  update  the  threshold  according  to  the  new  label

         threshold->ThresholdBetween(lblValues(i),lblValues(i));

         mcubes->SetValue(0,lblValues(i));

         //  create  actor

         vtkSmartPointer<vtkActor>  isoActor  =  vtkSmartPointer<vtkActor>::New();

         isoActor->SetMapper(isoMapper);

         isoMapper->Update();

         QColor  c  =  ctable.at(lblValues(i));

         isoActor->GetProperty()->SetColor(c.red()/255.0,c.green()/255.0,c.blue()/255.0);

         lblsActors.append(isoActor);

         MainRenderer->AddActor(isoActor);

         vtkWidget->GetRenderWindow()->Render();

     }

Thanks
Johnson


On 6/27/2013 5:25 PM, Shawn Waldon wrote:
> Unfortunately that is as much as I know.  I found it a few weeks ago 
> here:
> http://www.vtk.org/Wiki/VTK/FAQ#Using_ReleaseDataFlag
>
> You should not need to clear the input with NULL as far as I know, but 
> keep in mind that the filter is set to delete its output, not its 
> input.  So you would need to set the flag on the filter that is 
> creating the brain3D in order to have the brain3D output data deleted.
>
> If you are declaring the same pipeline each time through the loop, you 
> may be able to set up the pipeline initially and have the loop only 
> feed it different input data each time, modify parameters on filters 
> (remember to call Update()) and do something with the output. 
>  However, depending on what you are doing with the resulting data you 
> may need to copy the output if using this approach.
>
> Shawn
>
>
> On Thu, Jun 27, 2013 at 6:05 PM, johnsonjonaris <jgadel2 at uic.edu 
> <mailto:jgadel2 at uic.edu>> wrote:
>
>     HI
>     Thanks Shawn for your reply, that was quick.
>     I tried to do as you suggested with no luck :(
>     for example, I did the following for the vtkImageThreshold filter:
>
>             threshold = vtkSmartPointer<vtkImageThreshold>::New();
>     threshold->ThresholdBetween(lblValues(i),lblValues(i)); // lblValues
>     is a vector of the labels
>             threshold->SetOutValue(0);
>             threshold->SetInput(brain3D);
>             threshold->ReleaseDataFlagOn();
>
>     Note that every time in the loop I declare the pipeline elements
>     with New()
>     Also, at the end of the loop I need to clear the input with NULL
>     in order to
>     clean the memory.
>     Any suggestions ?
>     Regards
>
>
>
>
>     -----
>     Johnson Jonaris
>     PhD Candidate
>     Electrical & Computer Eng
>     University of IL at Chicago
>     --
>     View this message in context:
>     http://vtk.1045678.n5.nabble.com/vtk-pipeline-problem-tp5721639p5721642.html
>     Sent from the VTK - Users mailing list archive at Nabble.com.
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