[vtkusers] Does the vtk Delete methods recursively delete?

[Amy Henderson]

Keep in mind that VTK does reference counting, and Delete only calls the 
destructor when the reference count goes to 0. Adding a part to a 
vtkAssembly increases the reference count by 1 of the actor added, so you 
should call Delete on the actor immediately after adding it to the 
assembly. This puts the reference count back to 1, and when Delete is 
called in the assembly, and it calls Delete on the actors, then they will 
destruct.  The code (in C++) would look something like this:

vtkActor *actor1 = vtkActor::New();
vtkActor *actor2 = vtkActor::New();
vtkActor *actor3 = vtkActor::New();

vtkAssembly *assembly = vtkAssembly::New();
assembly->AddPart(actor1);
assembly->AddPart(actor2);
assembly->AddPart(actor3);

actor1->Delete();
actor2->Delete();
actor3->Delete();

< The rest of your code that uses vtkAssembly goes here. >

assembly->Delete();

- Amy

At 04:06 AM 3/17/2004, Veerapuram Varadhan wrote:
>Hi Benjamin,
>
>No need to iterate though the prop collection, the delete() of vtkAssembly
>object will essentially call delete() of each of the actors added to it.
>
>It is a common funtionality of all Delete() in all the vtk classes.
>
>Rgds,
>
>V. Varadhan
>
> > If I create an vtkAssembly class, add to it say 3 vtkActor objects using
> > the AddPart(..) routine, and then do:
> > myvtkAssbly->Delete();
> >
> > will this cause all of the vtkActor objects in the vtkAssembly object to
> > have their own Delete() routine called upon them? or do I have to:
> >
> > aProp3dCollection = myvtkAssbly->GetParts()
> >
> > then iterate through the prop collection calling:
> > (aProp3dCollection->GetNextProp())->Delete();
> >
> > to delete all the vtkActor objects in the assembly?
> >
> >
> > Regards,
> > Benjamin Burrell
> >
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