[vtkusers] Using vtkLassooStencilSource

[David Gobbi]

About the memory, the vtkLassooStencilSource::SetInformationInput()
method might leak, I'm not 100% sure but I'm investigating it.  If the
size and voxel spacing of your images never change, you can get rid of
SetInformationInput() and use these on the LassooStencil instead:

SetOutputSpacing();
SetOutputOrigin();
SetOutputWholeExtent();

Hopefully I'll have a definite answer soon about whether the new class
is leaking.

  David

On Sat, Nov 6, 2010 at 4:40 PM, Alexis Cheng <acheng_1221 at hotmail.com> wrote:
> Hi David,
>
> Thanks for making these classes, I'll try out vtkROIStencilSource after I
> fix this error. I must have accidentally left out the end of the error
> message:
>
> ERROR: In ..\..\VTK\Common\vtkMultiThreader.cxx, line 285
>  vtkMultiThreader [605C96A0]: Error in thread creation !!!
>
> Looking at the windows task manager, it seems like my physical memory is
> decreasing at a constant rate until the error occurs. I suspect that there
> is likely a memory leak in my code somewhere. I assume that should also
> account for the thread creation error.
>
> Many Thanks,
> Alexis Cheng
> Electrical Engineering
> University of British Columbia
>
>
>
>
>
>> From: david.gobbi at gmail.com
>> Date: Sat, 6 Nov 2010 16:09:06 -0600
>> Subject: Re: [vtkusers] Using vtkLassooStencilSource
>> To: acheng_1221 at hotmail.com
>> CC: vtkusers at vtk.org
>>
>> Hi Alexis,
>>
>> Thanks for trying this out. Your code for using the class is correct.
>>
>> For the first message, the one vtkMultiThreader.cxx, does it give any
>> sort of error info?
>>
>> The second error about memory allocation is a strange one, it is
>> complaining about allocating 1231041 bytes which is only about the
>> size of one video frame. Try using the Windows Task Manager to see
>> how your computer's memory use increases when you run your
>> application.
>>
>> About Slicer, yes you generally should rebuild after updating VTK. To
>> be more specific, it is only certain changes to the VTK header files
>> that will make a rebuild necessary, but better safe than sorry.
>>
>> David
>>
>>
>> On Sat, Nov 6, 2010 at 3:11 PM, Alexis Cheng <acheng_1221 at hotmail.com>
>> wrote:
>> > Hi David,
>> >
>> > I can certainly provide an informal review of vtkLassooStencilSource and
>> > vtkROIStencilSource, but first, I'm receiving an odd error during
>> > runtime.
>> >
>> > I'm using vtkLassooStencilSource and generating the stencil like this:
>> >
>> >         vtkSmartPointer<vtkLassooStencilSource> LassooStencil =
>> > vtkSmartPointer<vtkLassooStencilSource>::New();
>> >         LassooStencil->SetPoints(points);
>> >         LassooStencil->SetInformationInput(MTImage);
>> >
>> >         vtkSmartPointer<vtkImageBlend> blend1 =
>> > vtkSmartPointer<vtkImageBlend>::New();
>> >         blend1->SetStencil(LassooStencil->GetOutput());
>> >         blend1->AddInput(MTImage);
>> >         blend1->AddInput(BlackImage);
>> >
>> > I'm interfacing with 3D Slicer and can see the stencil within my image.
>> > It's
>> > also running many times faster than when I generated the stencil using
>> > vtkImplicitFunctionToStencilData. However, after several minutes, a
>> > vtkOutputWindow pops up indicating:
>> >
>> > ERROR: In ..\..\VTK\Common\vtkMultiThreader.cxx, line 285
>> > vtkMultiThreader [605C96A0]
>> >
>> > The above message is repeated a number of times before ending with:
>> >
>> > ERROR: In c:\sliver3-lib\vtk\common\vtkDataArrayTemplate.txx, line 142
>> > vtkUnsignedCharArray [605D3490]: Unable to allocate 1231041 elements of
>> > (The
>> > rest of the message is out of view of the window)
>> >
>> > This did not occur with vtkImplicitFunctionToStencilData. Do you have
>> > any
>> > idea if this error is related to these new classes? Also, do I have to
>> > rebuild Slicer every time I modify the VTK package?
>> >
>> > Thanks,
>> > Alexis Cheng
>> > Electrical Engineering
>> > University of British Columbia
>> >
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