[vtkusers] Delete actor and release memory

[Nicolas Rannou]

*Actor:*
create                       -> ref count == 1
add to renderer          -> ref count == 2
remove from renderer -> ref count == 1
delete                       -> ref count == 1576215064, -304508392, etc.

*PolyData:*
create                                                                -> ref
count == 1
add to mapper                                                    -> ref
count == 3
add mapper to actor, add actor to renderer, render -> ref count == 5
remove actor from renderer, delete actor               -> ref count == 3
delete                                                                -> ref
count == 52101520, -304508392, etc.

Something interesting I noticed is that if I do the same, without using the
renderer (adding/removing actors), the polydata ref count looks fine:

*
Actor:
create                       -> ref count == 1
delete                       -> ref count == 1576215064, -304508392, etc.

PolyData:
create                                                                -> ref
count == 1
add to mapper                                                    -> ref
count == 3
**
delete related actor                                             -> ref
count == 3
*
*
delete                                                                -> ref
count == 0
***


I tried the vtk master and 5.6.1 tag from github.

Thanks


On Tue, Jul 5, 2011 at 6:28 PM, Xiaofeng Z <xf10036 at hotmail.com> wrote:

>   Does the memory location pointed by variable actor still contain a valid
> object (e.g. reference count > 0) after actor->Delete()?  If not, then
> memory used by actor should have been released.
>
> xz
>
>  *From:* Nicolas Rannou <nicolas.lists at gmail.com>
> *Sent:* Tuesday, July 05, 2011 9:10 AM
> *To:* Sebastien Jourdain <sebastien.jourdain at kitware.com>
> *Cc:* vtkusers at public.kitware.com
> *Subject:* Re: [vtkusers] Delete actor and release memory
>
> Hi Sebastien,
>
> Yes, I don't delete it on purpose.
>
> I would like to keep the polydata in memory but delete everything else
> which is related to the visualization in order to decrease the memory usage!
>
> Thanks
>
> Nicolas
>
> On Sat, Jul 2, 2011 at 11:19 PM, Sebastien Jourdain <
> sebastien.jourdain at kitware.com> wrote:
>
>> You never deleted the sphere.
>>
>> On Tue, Jun 28, 2011 at 5:56 PM, Nicolas Rannou <nicolas.lists at gmail.com>
>> wrote:
>> > Hi all,
>> > I would like to delete/remove actors from my rendering window to free
>> > memory.
>> > The issue is that the memory usage doesn't decrease after
>> removing/deleting
>> > the actors.
>> > From my understanding, both following pseudo-codes should use the same
>> > amount of memory.
>> > But,
>> > The first one uses: 15 Mb for 1000 spheres:
>> > The second uses: 90 Mb for 1000 spheres:
>> > How should I proceed in the 2nd case, to get back to the "original"
>> memory
>> > usage without actor?
>> > Thanks,
>> >
>> > Nicolas
>> > ______________________________
>> > 15 Mb
>> > ______________________________
>> > //Create a sphere
>> > vtkSphereSource* sphere = new ...
>> > ______________________________
>> > 90 Mb
>> > ______________________________
>> > //Create sphere
>> > vtkSphereSource* sphere = new ...
>> > // mapper
>> > vtkMapper* mapper ...
>> > mapper->SetInput( sphere->GetOutput() )
>> > // actor
>> > vtkActor* actor...
>> > actor->SetMapper(mapper)
>> > mapper->Delete()
>> > // Add and remove actor
>> > renderer->AddActor(actor)
>> > renderer->RemoveActor(actor)
>> > // Delete actor
>> > actor->Delete()
>> > ______________________________
>> > ______________________________
>> >
>> >
>> > _______________________________________________
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>
>
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