[vtkusers] vtk pipeline problem

[Johnson]

I followed your suggestion, I created the pipeline outside, updated the 
labels ID that should be visualized in the loop, this have affected two 
steps: the threshold and the MarchingCubes

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

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

I then update the last step which is the stripper:


         stripper->Update();


At each instant of the loop I create a mapper and an actor

         vtkSmartPointer<vtkPolyDataMapper>  isoMapper  =  vtkSmartPointer<vtkPolyDataMapper>::New();
         isoMapper->SetInputConnection(stripper->GetOutputPort());
         isoMapper->ScalarVisibilityOff();
         isoMapper->ReleaseDataFlagOn();
         //  create  actor
         vtkSmartPointer<vtkActor>  isoActor  =  vtkSmartPointer<vtkActor>::New();
         isoActor->SetMapper(isoMapper);
         
	QColor  c  =  ctable.at(lblValues(i));	// set a color for the actor
         isoActor->GetProperty()->SetColor(c.red()/255.0,c.green()/255.0,c.blue()/255.0);
         
	lblsActors.append(isoActor);		// save the actor in a list to control it later
         MainRenderer->AddActor(isoActor);	// add the actor to the renderer
         vtkWidget->GetRenderWindow()->Render();	// render

I have also removed the memory clearing part as you suggested,  the memory issue is fixed, but the labels are created then disappear from the visualization, also the actors that I save in the lblsActor list
can not be controllable anymore. I believe you are correct in getting the pipeline outside the loop, however, I don't know the correct steps to make
the visualization work.

Regards
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
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