[vtkusers] Delete actor and release memory

[Xiaofeng Z]

That's interesting, and quite unintuitive!  maybe someone with better understanding of VTK's inner work can offer an explanation!

Xiaofeng

Date: Wed, 6 Jul 2011 10:25:55 -0400
Subject: Re: [vtkusers] Delete actor and release memory
From: nicolas.lists at gmail.com
To: xf10036 at hotmail.com
CC: sebastien.jourdain at kitware.com; vtkusers at public.kitware.com

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



PolyData:create                                                                -> ref count == 1add to mapper                                                    -> ref count == 3


add mapper to actor, add actor to renderer, render -> ref count == 5remove actor from renderer, delete actor               -> ref count == 3delete                                                                -> 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 == 1delete                       -> ref count == 1576215064, -304508392, etc.

PolyData:create                                                                -> ref count == 1add 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 
Sent: Tuesday, July 05, 2011 9:10 AM
To: Sebastien Jourdain 
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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