Access violation when deleting actor made from GLTF importer

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1

Hello,

My application have to load different scenes repeatedly (synoptic views for SCADA application).
I need to clean-up properly the renderer between to scenes to avoid increasing memory usage.
I use a loop to clean-up like this:

vtkActorCollection* actors = vtkActorCollection::New();
actors = renderer->GetActors();
actors->InitTraversal();
vtkActor nextActor = actors->GetNextActor();
while (nextActor != NULL)
{
renderer->RemoveActor(nextActor);
nextActor->Delete(); // this line with access viloation
nextActor = actors->GetNextActor();
}

it works fine with simple objetcs (cubes…) or OBJ imported files but raise an “access violation” on the delete line if objects are loaded with GLTF importer.

is it a bug or there is another way to clean-up the scene ?
I use the 8.9.0 version of the VTK library.

Thanks for help.

2

You should not delete the actor, removing it is enough. You can also compile VTK with VTK_DEBUG_LEAKS CMake option to help you with the management of VTK resources.
It also looks like you will have a leak here on the vtkActorCollection object.
Try this:

vtkActorCollection* actors = renderer->GetActors();
actors->InitTraversal();
vtkActor nextActor = actors->GetNextActor();
while (nextActor != nullptr)
{
  renderer->RemoveActor(nextActor);
  nextActor = actors->GetNextActor();
}

Alternatively, you can simply try: renderer->GetActors()->RemoveAllItems();

1 Like
3

It works now without deleting actor (RemoveAllItems() is nice).

Thanks for your help.

4

Sorry for my previous reply. RemoveAllItems doesn’t work. It doesn’t remove the actor from the renderer.
The loop is correct.

vtkActorCollection* actors = renderer->GetActors();
actors->InitTraversal();
vtkActor* nextActor = actors->GetNextActor();
while (nextActor != NULL)
	 {
	 renderer->RemoveActor(nextActor);
	 nextActor = actors->GetNextActor();
	 }
1 Like