[vtkusers] Deleting / Hiding all the objects in a window

[David E DeMarle]

Because VTK is lazily evaluated. The pipeline doesn't flow
automatically whenever anything changes. You have to call Render() or
Update() for the pipeline to recognize that a change happened. This
lets you aggregate changes, which is important for big data.

David E DeMarle
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x109



On Thu, Nov 19, 2009 at 8:03 AM, David Doria <daviddoria+vtk at gmail.com> wrote:
> On Thu, Nov 19, 2009 at 3:18 AM, Bryn Lloyd <blloyd at vision.ee.ethz.ch> wrote:
>> David,
>>
>> I had a look in the Test case for and found these lines before GetNextProp:
>>
>>
>>  vtkCollectionSimpleIterator sit;
>>  props->InitTraversal( sit );
>>  int nprops = props->GetNumberOfItems();
>>
>>
>> It looks like you need to call InitTraversal() before you call
>> GetNextProp().
>>
>> I don't think you need to use the vtkCollectionSimpleIterator though, since
>> there are also versions of these function without the iterator.
>>
>>
>> -Bryn
>
> Thanks Bryn, that answers the two main questions. However, I still
> don't understand why the window isn't updated after each actor is
> deleted until I click the mouse in the window:
> http://www.vtk.org/Wiki/Hide_an_actor
>
> Any thoughts?
>
> Thanks,
>
> David
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