[vtkusers] Help with crashes in VTK
Xiaofeng Z
xf10036 at hotmail.com
Fri Sep 9 10:53:12 EDT 2011
I don't see anything wrong in your code snippet. Given all the information I have, I can only say this:
1. if the crash occurs consistently, make sure you you're dealing with exactly one vtk code base and using the exact same compiler.
2. if the crash occurs randomly, check for racing condition between threads.
Date: Thu, 8 Sep 2011 20:03:58 -0700
Subject: Re: [vtkusers] Help with crashes in VTK
From: jonmorra at gmail.com
To: xf10036 at hotmail.com
CC: david.gobbi at gmail.com; vtkusers at vtk.org
So I've spent a bunch of time and removed all the references to vtkSmartPointer. I'm still getting a lot of crashes. Here is an example of a crash that I just got without any use of vtkSmartPointers
My code
vtkPolyData* vtkPipelines::getOrganMesh(vtkImageData * const binaryImage) { vtkPolyData *returnedData = NULL;
vtkMarchingCubes *marching = vtkMarchingCubes::New();
marching->SetInput(binaryImage); marching->ComputeGradientsOff(); marching->ComputeNormalsOff(); marching->ComputeScalarsOff(); marching->SetValue(0, 0.5);
if (marching->GetOutput()->GetNumberOfPoints() > 0) { // The decimation makes the render time much faster vtkDecimatePro* decimate = vtkDecimatePro::New(); decimate->SetInputConnection(marching->GetOutputPort());
decimate->SetTargetReduction(0.6); decimate->Update();
returnedData = vtkPolyData::New(); returnedData->DeepCopy(decimate->GetOutput());
decimate->Delete(); } else { marching->Update(); returnedData = vtkPolyData::New(); returnedData->DeepCopy(marching->GetOutput());
} marching->Delete(); // Last line of my code before crash occurs return returnedData;}
Stack Trace 4a8bdc42()
vtkCommon.dll!vtkGarbageCollectorImpl::CollectComponent(vtkGarbageCollectorImpl::ComponentType * c=0x073d0c18) Line 702 + 0x2b bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::CollectInternal(vtkObjectBase * root=0x07ac2dc8) Line 476 C++
vtkCommon.dll!vtkGarbageCollector::Collect(vtkObjectBase * root=0x07ac2dc8) Line 907 C++
vtkCommon.dll!vtkObjectBase::UnRegisterInternal(vtkObjectBase * __formal=0x00000000, int check=1) Line 287 + 0x6 bytes C++
vtkCommon.dll!vtkObject::UnRegisterInternal(vtkObjectBase * o=0x00000000, int check=1) Line 885 + 0x11 bytes C++
vtkFiltering.dll!vtkAlgorithm::UnRegister(vtkObjectBase * o=0x00000000) Line 918 C++
vtkCommon.dll!vtkObjectBase::Delete() Line 128 C++> MVSOrganizerQt.exe!vtkPipelines::getOrganMesh(vtkImageData * const binaryImage=0x118a7190) Line 507 + 0x9 bytes C++
MVSOrganizerQt.exe!CreateOrganMeshThread::doOrganCreation() Line 30 + 0x6 bytes C++
I'm getting very discouraged trying to fix all of these crashes. Can anyone suggest some reason for this?
If it matters, this is being called from a thread (although other crashes do not occur in threads)
On Wed, Sep 7, 2011 at 4:40 PM, Xiaofeng Z <xf10036 at hotmail.com> wrote:
vtk doesn't use thread to do garbage collection. You have too thread running vtk code and your crashes are most likely related to a race condition.
Date: Wed, 7 Sep 2011 14:14:48 -0700
Subject: Re: [vtkusers] Help with crashes in VTK
From: jonmorra at gmail.com
To: xf10036 at hotmail.com; david.gobbi at gmail.com
CC: vtkusers at vtk.org
So I was playing around with removing vtkSmartPointers passed by reference to see if that fixed my issue.
1. Would passing a vtkSmartPointer by const reference be an issue?2. I got the following crash outlined below. It does not reference any code I wrote at all. Also in my debugger it says that there are 2 vtk garbage collection threads running. My understanding of smart pointers is that a garbage collector is unnecessary because if the reference count = 0 then the object is removed. Also, what could cause this crash?
Thread 1 stack trace cccccccc() vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x0687f280) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x179ff5f4) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f82880, void * ptr=0x04047640) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f82880, void * ptr=0x04047640, const char * __formal=0x6490d51c) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x179ffd90, vtkObjectBase * obj=0x03f82880, void * ptr=0x04047640, const char * desc=0x6490d51c) Line 1069 C++
vtkFiltering.dll!vtkGarbageCollectorReport<vtkInformation>(vtkGarbageCollector * collector=0x179ffd90, vtkInformation * & ptr=, const char * desc=0x6490d51c) Line 201 + 0x18 bytes C++
vtkFiltering.dll!vtkDataObject::ReportReferences(vtkGarbageCollector * collector=0x179ffd90) Line 1022 C++
vtkFiltering.dll!vtkPointSet::ReportReferences(vtkGarbageCollector * collector=0x179ffd90) Line 351 C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x0687f168) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x179ff718) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x04047618, void * ptr=0x06bf9270) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x04047618, void * ptr=0x06bf9270, const char * __formal=0x6490cc14) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x179ffd90, vtkObjectBase * obj=0x04047618, void * ptr=0x06bf9270, const char * desc=0x6490cc14) Line 1069 C++
vtkCommon.dll!vtkGarbageCollectorReport<vtkObjectBase>(vtkGarbageCollector * collector=0x179ffd90, vtkObjectBase * & ptr=, const char * desc=0x6490cc14) Line 201 + 0x17 bytes C++
vtkCommon.dll!vtkInformation::ReportAsObjectBase(vtkInformationKey * key=0x03ef5f78, vtkGarbageCollector * collector=0x179ffd90) Line 826 + 0x16 bytes C++
vtkCommon.dll!vtkInformationKey::ReportAsObjectBase(vtkInformation * info=0x03f86bd8, vtkGarbageCollector * collector=0x179ffd90) Line 136 C++
vtkCommon.dll!vtkInformation::ReportReferences(vtkGarbageCollector * collector=0x179ffd90) Line 812 + 0xc bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x0687f248) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x179ff864) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f86bd8, void * ptr=0x03f84698) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f86bd8, void * ptr=0x03f84698, const char * __formal=0x6571055c) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x179ffd90, vtkObjectBase * obj=0x03f86bd8, void * ptr=0x03f84698, const char * desc=0x6571055c) Line 1069 C++
vtkCommon.dll!vtkGarbageCollectorReport<vtkInformation>(vtkGarbageCollector * collector=0x179ffd90, vtkInformation * & ptr=, const char * desc=0x6571055c) Line 201 + 0x17 bytes C++
vtkCommon.dll!vtkInformationVector::ReportReferences(vtkGarbageCollector * collector=0x179ffd90) Line 227 + 0x28 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x06983e58) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x179ff980) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f85968, void * ptr=0x03c6bb08) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f85968, void * ptr=0x03c6bb08, const char * __formal=0x64910f5c) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x179ffd90, vtkObjectBase * obj=0x03f85968, void * ptr=0x03c6bb08, const char * desc=0x64910f5c) Line 1069 C++
vtkFiltering.dll!vtkGarbageCollectorReport<vtkInformationVector>(vtkGarbageCollector * collector=0x179ffd90, vtkInformationVector * & ptr=, const char * desc=0x64910f5c) Line 201 + 0x18 bytes C++
vtkFiltering.dll!vtkExecutive::ReportReferences(vtkGarbageCollector * collector=0x179ffd90) Line 306 + 0xf bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x06983c60) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x179ffa9c) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03c6bae0, void * ptr=0x03fd5f44) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03c6bae0, void * ptr=0x03fd5f44, const char * __formal=0x64910cac) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x179ffd90, vtkObjectBase * obj=0x03c6bae0, void * ptr=0x03fd5f44, const char * desc=0x64910cac) Line 1069 C++
vtkCommon.dll!vtkGarbageCollectorReport<vtkObjectBase>(vtkGarbageCollector * collector=0x179ffd90, vtkObjectBase * & ptr=, const char * desc=0x64910cac) Line 201 + 0x17 bytes C++
vtkCommon.dll!vtkSmartPointerBase::Report(vtkGarbageCollector * collector=0x179ffd90, const char * desc=0x64910cac) Line 96 + 0x10 bytes C++
vtkFiltering.dll!vtkInformationExecutivePortKey::Report(vtkInformation * info=0x03f84158, vtkGarbageCollector * collector=0x179ffd90) Line 157 + 0x17 bytes C++
vtkCommon.dll!vtkInformation::ReportReferences(vtkGarbageCollector * collector=0x179ffd90) Line 812 + 0xc bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x06983d08) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x179ffbe0) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f84158, void * ptr=0x04047464) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f84158, void * ptr=0x04047464, const char * __formal=0x6490d504) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x179ffd90, vtkObjectBase * obj=0x03f84158, void * ptr=0x04047464, const char * desc=0x6490d504) Line 1069 C++
vtkFiltering.dll!vtkGarbageCollectorReport<vtkInformation>(vtkGarbageCollector * collector=0x179ffd90, vtkInformation * & ptr=, const char * desc=0x6490d504) Line 201 + 0x18 bytes C++
vtkFiltering.dll!vtkDataObject::ReportReferences(vtkGarbageCollector * collector=0x179ffd90) Line 1022 + 0xf bytes C++
vtkFiltering.dll!vtkPointSet::ReportReferences(vtkGarbageCollector * collector=0x179ffd90) Line 351 C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x06983b48) Line 552 C++
> vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x02fe0000) Line 522 + 0x8 bytes C++
kernel32.dll!762214dd() [Frames below may be incorrect and/or missing, no symbols loaded for kernel32.dll]
msvcr90.dll!73193c3a() msvcr90.dll!731534c7()
kernel32.dll!7622339a() ntdll.dll!76f69ed2()
ntdll.dll!76f69ea5()
Thread 2 stack trace
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x06718db8) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x17aff5f4) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f82880, void * ptr=0x04047640) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f82880, void * ptr=0x04047640, const char * __formal=0x6490d51c) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x17affd90, vtkObjectBase * obj=0x03f82880, void * ptr=0x04047640, const char * desc=0x6490d51c) Line 1069 C++
vtkFiltering.dll!vtkGarbageCollectorReport<vtkInformation>(vtkGarbageCollector * collector=0x17affd90, vtkInformation * & ptr=, const char * desc=0x6490d51c) Line 201 + 0x18 bytes C++
vtkFiltering.dll!vtkDataObject::ReportReferences(vtkGarbageCollector * collector=0x17affd90) Line 1022 C++
vtkFiltering.dll!vtkPointSet::ReportReferences(vtkGarbageCollector * collector=0x17affd90) Line 351 C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x06679c80) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x17aff718) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x04047618, void * ptr=0x06bf9270) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x04047618, void * ptr=0x06bf9270, const char * __formal=0x6490cc14) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x17affd90, vtkObjectBase * obj=0x04047618, void * ptr=0x06bf9270, const char * desc=0x6490cc14) Line 1069 C++
vtkCommon.dll!vtkGarbageCollectorReport<vtkObjectBase>(vtkGarbageCollector * collector=0x17affd90, vtkObjectBase * & ptr=, const char * desc=0x6490cc14) Line 201 + 0x17 bytes C++
vtkCommon.dll!vtkInformation::ReportAsObjectBase(vtkInformationKey * key=0x03ef5f78, vtkGarbageCollector * collector=0x17affd90) Line 826 + 0x16 bytes C++
vtkCommon.dll!vtkInformationKey::ReportAsObjectBase(vtkInformation * info=0x03f86bd8, vtkGarbageCollector * collector=0x17affd90) Line 136 C++
vtkCommon.dll!vtkInformation::ReportReferences(vtkGarbageCollector * collector=0x17affd90) Line 812 + 0xc bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x06679c10) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x17aff864) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f86bd8, void * ptr=0x03f84698) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f86bd8, void * ptr=0x03f84698, const char * __formal=0x6571055c) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x17affd90, vtkObjectBase * obj=0x03f86bd8, void * ptr=0x03f84698, const char * desc=0x6571055c) Line 1069 C++
vtkCommon.dll!vtkGarbageCollectorReport<vtkInformation>(vtkGarbageCollector * collector=0x17affd90, vtkInformation * & ptr=, const char * desc=0x6571055c) Line 201 + 0x17 bytes C++
vtkCommon.dll!vtkInformationVector::ReportReferences(vtkGarbageCollector * collector=0x17affd90) Line 227 + 0x28 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x06717548) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x17aff980) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f85968, void * ptr=0x03c6bb08) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f85968, void * ptr=0x03c6bb08, const char * __formal=0x64910f5c) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x17affd90, vtkObjectBase * obj=0x03f85968, void * ptr=0x03c6bb08, const char * desc=0x64910f5c) Line 1069 C++
vtkFiltering.dll!vtkGarbageCollectorReport<vtkInformationVector>(vtkGarbageCollector * collector=0x17affd90, vtkInformationVector * & ptr=, const char * desc=0x64910f5c) Line 201 + 0x18 bytes C++
vtkFiltering.dll!vtkExecutive::ReportReferences(vtkGarbageCollector * collector=0x17affd90) Line 306 + 0xf bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x067174d8) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x17affa9c) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03c6bae0, void * ptr=0x03fd6624) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03c6bae0, void * ptr=0x03fd6624, const char * __formal=0x64910cac) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x17affd90, vtkObjectBase * obj=0x03c6bae0, void * ptr=0x03fd6624, const char * desc=0x64910cac) Line 1069 C++
vtkCommon.dll!vtkGarbageCollectorReport<vtkObjectBase>(vtkGarbageCollector * collector=0x17affd90, vtkObjectBase * & ptr=, const char * desc=0x64910cac) Line 201 + 0x17 bytes C++
vtkCommon.dll!vtkSmartPointerBase::Report(vtkGarbageCollector * collector=0x17affd90, const char * desc=0x64910cac) Line 96 + 0x10 bytes C++
vtkFiltering.dll!vtkInformationExecutivePortKey::Report(vtkInformation * info=0x03f84b30, vtkGarbageCollector * collector=0x17affd90) Line 157 + 0x17 bytes C++
vtkCommon.dll!vtkInformation::ReportReferences(vtkGarbageCollector * collector=0x17affd90) Line 812 + 0xc bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x067173f8) Line 552 C++
vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x17affbe0) Line 522 + 0x8 bytes C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f84b30, void * ptr=0x04046ce4) Line 639 C++
vtkCommon.dll!vtkGarbageCollectorImpl::Report(vtkObjectBase * obj=0x03f84b30, void * ptr=0x04046ce4, const char * __formal=0x6490d504) Line 602 C++
vtkCommon.dll!vtkGarbageCollectorReportInternal(vtkGarbageCollector * collector=0x17affd90, vtkObjectBase * obj=0x03f84b30, void * ptr=0x04046ce4, const char * desc=0x6490d504) Line 1069 C++
vtkFiltering.dll!vtkGarbageCollectorReport<vtkInformation>(vtkGarbageCollector * collector=0x17affd90, vtkInformation * & ptr=, const char * desc=0x6490d504) Line 201 + 0x18 bytes C++
vtkFiltering.dll!vtkDataObject::ReportReferences(vtkGarbageCollector * collector=0x17affd90) Line 1022 + 0xf bytes C++
vtkFiltering.dll!vtkPointSet::ReportReferences(vtkGarbageCollector * collector=0x17affd90) Line 351 C++
vtkCommon.dll!vtkGarbageCollectorImpl::VisitTarjan(vtkObjectBase * obj=0x067175f0) Line 552 C++
> vtkCommon.dll!vtkGarbageCollectorImpl::MaybeVisit(vtkObjectBase * obj=0x00000000) Line 522 + 0x8 bytes C++
QtGui4.dll!009284f2() kernel32.dll!762214dd()
msvcr90.dll!73193c3a() msvcr90.dll!731534c7()
kernel32.dll!7622339a() ntdll.dll!76f69ed2()
ntdll.dll!76f69ea5()
On Wed, Sep 7, 2011 at 9:45 AM, Xiaofeng Z <xf10036 at hotmail.com> wrote:
>I've been using vtkImageData::New(), followed by vtkImageData->DeepCopy(filter->GetOutput()). I've been doing this cause I notice that once I delete the filter the output no longer exists.
Don't deep copy the image, instead do: vtkImageData* filterOutput = filter->GetOutput(); filterOutput->Register(0); // increment the ref count
to keep the output in the memory. Just make sure you pair off every New() or Register() with a Delete(). BTW, I'm not for or against the use of smart pointer for any fundamental reason. If one knows very well how a smart pointer class works, using the smart pointer to left the burden of tracking memory allocation can be very helpful. When I do decided to use smart pointer, I use it exclusively, much like in Java where every variable is a managed smart pointer. Mixing the usage of smart pointers and naked pointers is where trouble comes in.
HTH
On Tue, Sep 6, 2011 at 11:55 AM, David Gobbi <david.gobbi at gmail.com> wrote:
On Tue, Sep 6, 2011 at 12:34 PM, Jonathan Morra <jonmorra at gmail.com> wrote:
This could make sense, I'm going to try and change all my method signatures to pass around const references to vtkSmartPointers where appropriate. Do you know what happens to the reference count upon returning a vtkSmartPointer?
In VTK, smart pointers should only be used to store references, not to pass them. VTK methods should take regular pointers as arguments.
The general rules are:
1) Refcounts are not automatically incremented when objects are returned, i.e. when an object is returned to you, then you are just "borrowing" it. If you need to own it for a while, then store it in a smart pointer.
2) Refcounts are not automatically incremented when objects are passed to a method. If a method needs to own the object for a while, it should store it in a smart pointer. All methods in the VTK libraries that need to own the objects that are passed to them will increment the refcount of those objects, either by storing it in a smart pointer or by calling Register() on it.
There are a few very rare exceptions to rule #1, such as the NewInstance() method.
- David
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