[vtkusers] vtkBlend Output

[David Gobbi]

They're available now.  I sidestepped the review process because these
classes don't touch any critical bits of VTK code.  Opinions, however,
are always welcome.

  David

On Thu, Nov 4, 2010 at 12:48 PM, Alexis Cheng <acheng_1221 at hotmail.com> wrote:
> Hi David,
>
> Just to clarify, are these 2 classes available right now or is there a
> review process?
>
> Thanks,
> Alexis Cheng
> Electrical Engineering
> University of British Columbia
>
>> From: david.gobbi at gmail.com
>> Date: Thu, 4 Nov 2010 07:57:11 -0600
>> Subject: Re: [vtkusers] vtkBlend Output
>> To: acheng_1221 at hotmail.com
>> CC: vtkusers at vtk.org
>>
>> I've just committed two new classes for generating stencils:
>> 1) Imaging/vtkROIStencilSource - rectangles and ellipses
>> 2) Imaging/vtkLassooStencilSource - polygons and splines
>>
>> David
>>
>> On Wed, Nov 3, 2010 at 8:52 AM, David Gobbi <david.gobbi at gmail.com> wrote:
>> > Hi Alexis,
>> >
>> > The PolyDataToImageStencil filter requires a closed 3D polydata
>> > surface, like a box or a sphere.  It does not work with 2D contours.
>> >
>> > I have a "lassoo" class based on some of my old python code for doing
>> > ROI stencils, but it is incomplete.  It would work like
>> > ImplicitSelectionLoop for vtkImageStencilData, but a few hundred times
>> > faster.  I'll take a look at it today to see how much work it would be
>> > to finish it and contribute it to VTK.
>> >
>> >  David
>> >
>> > On Tue, Nov 2, 2010 at 6:07 PM, Alexis Cheng <acheng_1221 at hotmail.com>
>> > wrote:
>> >> Hi David,
>> >>
>> >> It certainly seems to be the Stencil filter that is slowing the system
>> >> down.
>> >> I am trying to use vtkPolyDataToImageStencil to see if that would be
>> >> any
>> >> faster, but I'm having some difficulties.
>> >>
>> >> I replaced this ImplicitFunction code:
>> >>
>> >>         vtkSmartPointer<vtkImplicitSelectionLoop> ImplicitLoop =
>> >> vtkSmartPointer<vtkImplicitSelectionLoop>::New();
>> >>         ImplicitLoop->SetLoop(points);
>> >>
>> >>         vtkSmartPointer<vtkImplicitFunctionToImageStencil>
>> >> dataToStencil =
>> >> vtkSmartPointer<vtkImplicitFunctionToImageStencil>::New();
>> >>         dataToStencil->SetInput(ImplicitLoop);
>> >>
>> >> with this PolyData code:
>> >>
>> >>         vtkSmartPointer<vtkCellArray> polygons =
>> >> vtkSmartPointer<vtkCellArray>::New();
>> >>         vtkSmartPointer<vtkPolygon> polygon =
>> >> vtkSmartPointer<vtkPolygon>::New();
>> >>         polygon->GetPointIds()->SetNumberOfIds(4); //make a quad
>> >>         polygon->GetPointIds()->SetId(0, 0);
>> >>         polygon->GetPointIds()->SetId(1, 1);
>> >>         polygon->GetPointIds()->SetId(2, 2);
>> >>         polygon->GetPointIds()->SetId(3, 3);
>> >>
>> >>         polygons->InsertNextCell(polygon);
>> >>
>> >>         vtkSmartPointer<vtkPolyData> quad =
>> >> vtkSmartPointer<vtkPolyData>::New();
>> >>         quad->SetPoints(points);
>> >>         quad->SetPolys(polygons);
>> >>
>> >>         vtkSmartPointer<vtkPolyDataToImageStencil> dataToStencil =
>> >> vtkSmartPointer<vtkPolyDataToImageStencil>::New();
>> >>         dataToStencil->SetInput(quad);
>> >>
>> >> The final image does not show the stencil with the PolyData code. Is
>> >> there a
>> >> difference in the implementation of the 2 filters where I would have a
>> >> different output or need a different input? Also, should I expect to
>> >> see any
>> >> increase in performance by using PolyData instead of ImplicitFunction?
>> >> Thanks for all your answers!
>> >>
>> >> Cheers,
>> >> Alexis Cheng
>> >> Electrical Engineering
>> >> University of British Columbia
>> >>
>> >>
>> >>
>> >>> From: david.gobbi at gmail.com
>> >>> Date: Mon, 1 Nov 2010 19:27:40 -0600
>> >>> Subject: Re: [vtkusers] vtkBlend Output
>> >>> To: acheng_1221 at hotmail.com
>> >>> CC: vtkusers at vtk.org
>> >>>
>> >>> Hi Alexis,
>> >>>
>> >>> Have you tried it without the stencil, for comparison? The
>> >>> vtkImplicitFunctionToImageStencil filter is very slow.
>> >>>
>> >>> David
>> >>>
>> >>>
>> >>> On Mon, Nov 1, 2010 at 5:57 PM, Alexis Cheng <acheng_1221 at hotmail.com>
>> >>> wrote:
>> >>> > Hi all,
>> >>> >
>> >>> > Is vtkBlend extremely resource intensive? I have a following piece
>> >>> > of
>> >>> > code
>> >>> > running: FinalImage is a vtkImageData object, MTImage is a
>> >>> > vtkImageData
>> >>> > object, and blend1 is a vtkImageBlend object.
>> >>> >
>> >>> >         blend1->SetStencil(dataToStencil->GetOutput());
>> >>> >         blend1->AddInput(MTImage);
>> >>> >         blend1->AddInput(BlackImage);
>> >>> >         blend1->SetOpacity(0,0.5);
>> >>> >         blend1->SetOpacity(1,0.5);
>> >>> >
>> >>> >         if(OutOfView)
>> >>> >         {
>> >>> >             FinalImage = MTImage;
>> >>> >         }
>> >>> >         else
>> >>> >         {
>> >>> >             FinalImage = blend1->GetOutput();
>> >>> >         }
>> >>> >         FinalImage->Update();
>> >>> >
>> >>> > The fps of my display decreases dramatically whenever the output
>> >>> > from
>> >>> > blend
>> >>> > is requested. Is this behaviour expected? Thanks in advance.
>> >>> >
>> >>> > Cheers,
>> >>> > Alexis Cheng
>> >>> > Electrical Engineering
>> >>> > University of British Columbia
>> >>> >
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>> >>
>> >
>
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