[vtkusers] FW: invalid vtkSource Pointer from vtkActor

[Luigi Laneve]

I've verified that if i try to extract the vtkSource object (SS) immediatly after the sphere "source-mapper-actor" definition it result a NULL pointer.
See the following instructions:-----vtkSphereSource *sphere=vtkSphereSource::New();			sphere->SetRadius(radius);			sphere->SetCenter(pf[0],pf[1],pf[2]);
		vtkPolyDataMapper *mapper_sphere = vtkPolyDataMapper ::New();			mapper_sphere->SetInput(sphere->GetOutput());					vtkActor *actor_sphere = vtkActor::New();			actor_sphere->SetMapper(mapper_sphere);			actor_sphere->GetProperty()->SetColor(1.,0.,0.);		 		actor_sphere->PickableOff();
		renderer->AddActor(actor_sphere); 		vtkMapper* map = actor_sphere->GetMapper();

			vtkSource* SS = map->GetInput()->GetSource();  SS is already NULL at this point!!!!!!!!!-----Any suggestion?
From: luigi_laneve at hotmail.com
To: vtkusers at vtk.org
Date: Fri, 9 Sep 2011 09:54:30 +0000
Subject: [vtkusers] FW:  invalid vtkSource Pointer from vtkActor








Please,
Any suggestion?
In the meantime i've verified how the bounds and the center positionof the mapper object is exactly the same of the previously inserted sphere.
Thank you.
From: luigi_laneve at hotmail.com
To: vtkusers at vtk.org
Date: Wed, 7 Sep 2011 16:43:34 +0000
Subject: [vtkusers] invalid vtkSource Pointer from vtkActor








Hi to all,
After loading a certain number of vtkSphereSource in a vtkPropCollection object (actor_garbage_collection) ,i want to define a callback that is able to read them in order to make some calculations.____________________________________________________________int n=actor_garbage_collection->GetNumberOfItems();				for(int i=0;i<n;i++)			{				vtkActor *actor=(vtkActor*)(actor_garbage_collection->GetItemAsObject(i));
				vtkMapper *mapper=actor->GetMapper(); 				vtkDataSet* dset=mapper->GetInput();				vtkSource* source = dset->GetSource();
				// SOME COMPUTATION
			}____________________________________________________________	
Well, GetNumberOfItems() returns the exact number of spheres previously inserted,GetItemAsObject returns a valid actor pointer - GetMapper returns a valid mapper pointer and GetInput returns a valid dataset pointer.
But i'm wondering how it's possible that GetSource returns A NULL source pointer :(
Thanks in advance for your contribute to my question.
Luigi.



 		 	   		  

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