[vtkusers] ReleaseDataFlagOn question

[Naveen Kumar Polapally]

I posting this problem before but could not solve my problem.
I see that  ReleaseDataFlagOn() works fine for Imaging pipeline
but not so for the graphics pipeline. I tried to look at the underlying 
code.

I see that the data is being released that by calling

vtkFieldData::Initialize()
{
  int i;
  if ( this->Data )
    {
    for ( i=0; i<this->GetNumberOfArrays(); i++ )
      {
	this->Data[i]->UnRegister(this);
      }
    delete [] this->Data;
    this->Data = NULL;
    }

  this->NumberOfArrays = 0;
  this->NumberOfActiveArrays = 0;
}

I see that this function gets called for both filters in imaging pipeline as 
well as graphics pipeline like the one shown below.
But the memory is getting released only imaging pipeline.

Try ImageReader->ImageMagnify

Try ImageReader->vtkMarchingCubes.

I have not been able to figure out the reason , because the methods in 
vtkDataObject and vtkSource are applicable to all the input data types
but still there is a difference.

It will be great if some one could help me with this.

Thanks,
naveen.




>From: "Naveen Kumar Polapally" <naveenpkumar at hotmail.com>
>To: vtkusers at public.kitware.com
>CC: will.schroeder at public.kitware.com
>Subject: Re: [vtkusers] ReleaseDataFlagOn question
>Date: Mon, 29 Oct 2001 18:50:09
>
>hi,
>I am reposting this as i have not received any help, can some form
>kitware reply to this question.
>
>I have graphics pipeline shown below.
>
>Reader->isosurfaceExtraction->PolyDataFilter->PolyDataFilter->etc
>
>I am trying to understand ReleaseDataFlag Option.I use ReleaseDataFlagOn 
>for
>all the filters in the pipeline, but Only
>the Reader seems to release the data,while the isosurfaceExtraction and
>polydatafilters don't seem to realese the data at all.
>
>I also tried using GlobalReleaseDataFlagOn by calling the output of each
>filter but it does seem to release the data at all.
>
>Did any one try to observe this.
>
>Can some one reply to this question.
>
>Thank you,
>
>naveen.
>
>
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