[vtkusers] Connected Components

[Michael Jackson]

I don't really understand as I never saw the original data set. The  
triangulation looks technically correct, but not very "smooth" Maybe  
you need to run a smoothing filter on the data?

Mike

On Nov 25, 2008, at 3:57 AM, prabhat246 wrote:

>
> Hi Mike,
> But there seems to be some problem. I am not getting the accurate
> triangulation that it should be.
> I cant see smooth surface, rather it is displaying uniform patches.  
> I am
> attaching a screenshot. http://www.nabble.com/file/p20677309/surface.JPG
> surface.JPG
>
> Can you suggest what might be wrong?
>
> Thanks
> Regards,
> Prabhat
>
>
> prabhat246 wrote:
>>
>> Hi Mike,
>> Thanks a million.... It worked. :)
>>
>> Regards,
>> Prabhat
>>
>> Mike Jackson-19 wrote:
>>>
>>> First off you need a matching con->Delete() for the
>>> vtkPolyDataConnectivityFilter * con =
>>> vtkPolyDataConnectivityFilter::New(); function otherwise you are
>>> leaking that filter object.
>>>
>>> Next, I bet this takes a really long time to run because for 10,000
>>> components, you have to run the same filter 10,000 times. How about
>>> this filter instead:
>>>
>>> //Find all the discrete components
>>> vtkSmartPointer<DiscreteParticleFilter> connectivity =
>>> vtkSmartPointer<DiscreteParticleFilter>::New();
>>> connectivity->SetInput( mc->GetOutput() );
>>> connectivity->Update(); //Force the pipeline to execute ...
>>> vtkPolyData* currentComponent = NULL;
>>> vtkPolyDataCollection* components = connectivity->GetPolyRegions();
>>> components->InitTraversal(); //Init the enumeration
>>> int count = components->GetNumberOfItems();
>>>
>>> //Iterate over each PolyLoop and decide how to triangulate it
>>> for (int i = 0; i < count; ++i) {
>>>   currentComponent = components->GetNextItem();
>>>   // Add Mapper and Actor code from below
>>> 	vtkPolyDataMapper *polymap;
>>> 	vtkActor * polyact;
>>> 	
>>> 	//std::cout<<connect->GetOutput()->GetNumberOfCells()<<std::endl;
>>> 		
>>> 	polymap = vtkPolyDataMapper::New();
>>> 	polymap->SetInput(currentComponent);
>>> 	polyact = vtkActor::New();
>>> 	polyact->SetMapper(polymap);
>>> 	renderer->AddActor(polyact);
>>> 	
>>> 	vtkBoxWidget *boxWidget = vtkBoxWidget::New();
>>> 	boxWidget->SetInteractor(iren);
>>> 	boxWidget->SetPlaceFactor(1);
>>> 	boxWidget->SetProp3D(polyact);
>>> 	boxWidget->PlaceWidget();
>>> 	boxWidget->SetOutlineFaceWires(1);
>>> 	boxWidget->SetScalingEnabled(0);
>>> 	boxWidget->SetRotationEnabled(1);
>>> 	boxWidget->OutlineFaceWiresOff();
>>> 	boxWidget->OutlineCursorWiresOff();
>>> 	boxWidget->HandlesOff();
>>> 	boxWidget->On();
>>>
>>> 	vtkMyCallback *callback = vtkMyCallback::New();
>>> 	boxWidget->AddObserver(vtkCommand::InteractionEvent, callback);
>>> }
>>>
>>> I am attaching the source files.
>>>
>>> _________________________________________________________
>>> Mike Jackson                  mike.jackson at bluequartz.net
>>> BlueQuartz Software                    www.bluequartz.net
>>> Principal Software Engineer                  Dayton, Ohio
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Nov 24, 2008, at 9:13 AM, prabhat246 wrote:
>>>
>>>>
>>>> Hi,
>>>>
>>>> I have a object containing large no. of multiple connected
>>>> components(say
>>>> 10,000). I want to be able to transform each component seperately.
>>>> I am
>>>> doing it in following way.
>>>>
>>>> for(int i = 0; i< NoOfRegions; i++)
>>>> 	{
>>>> 	vtkPolyDataConnectivityFilter * con =
>>>> vtkPolyDataConnectivityFilter::New();
>>>> 	con->SetInput(mc->GetOutput());
>>>> 	con->SetExtractionModeToSpecifiedRegions();
>>>> 	con->AddSpecifiedRegion(i);
>>>> 	connect->Update();
>>>>
>>>> 	vtkPolyDataMapper *polymap;
>>>> 	vtkActor * polyact;
>>>> 	
>>>> 	//std::cout<<connect->GetOutput()->GetNumberOfCells()<<std::endl;
>>>> 		
>>>> 	polymap = vtkPolyDataMapper::New();
>>>> 	polymap->SetInput(con->GetOutput());
>>>> 	polyact = vtkActor::New();
>>>> 	polyact->SetMapper(polymap);
>>>> 	renderer->AddActor(polyact);
>>>> 	
>>>> 	vtkBoxWidget *boxWidget = vtkBoxWidget::New();
>>>> 	boxWidget->SetInteractor(iren);
>>>> 	boxWidget->SetPlaceFactor(1);
>>>> 	boxWidget->SetProp3D(polyact);
>>>> 	boxWidget->PlaceWidget();
>>>> 	boxWidget->SetOutlineFaceWires(1);
>>>> 	boxWidget->SetScalingEnabled(0);
>>>> 	boxWidget->SetRotationEnabled(1);
>>>> 	boxWidget->OutlineFaceWiresOff();
>>>> 	boxWidget->OutlineCursorWiresOff();
>>>> 	boxWidget->HandlesOff();
>>>> 	boxWidget->On();
>>>>
>>>> 	vtkMyCallback *callback = vtkMyCallback::New();
>>>> 	boxWidget->AddObserver(vtkCommand::InteractionEvent, callback);
>>>> 	}
>>>>
>>>>
>>>> But It runs successfully if I have less no. of components say 10  
>>>> but
>>>> it
>>>> crashes on large no of componenets.. I feel that It is due to  
>>>> memory
>>>> crash.
>>>> Of course all these objects inside loop are not being deleted.
>>>>
>>>> is there anything that can be avoided to save memory?? or Is there
>>>> any other
>>>> lighter way to do this???
>>>> Please help me out.
>>>>
>>>> Thanks a lot
>>>> Prabhat Kumar Gupta
>>>>
>>>> -- 
>>>> View this message in context:
>>>> http://www.nabble.com/Connected-Components-tp20661092p20661092.html
>>>> Sent from the VTK - Users mailing list archive at Nabble.com.
>>>>
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>>>
>>>
>>>
>>>
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>>>
>>
>>
>
> -- 
> View this message in context: http://www.nabble.com/Connected-Components-tp20661092p20677309.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
>
> _______________________________________________
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