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List:       vtk-developers
Subject:    Re: [vtk-developers] Image rendering bug?
From:       David Gobbi <david.gobbi () gmail ! com>
Date:       2011-08-16 14:51:14
Message-ID: CANwS1=H2mha9Lh4eb0nwhhAEip0R8CT258mScNCJe7JEycUf0Q () mail ! gmail ! com
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Hi Ben,

The missing border has to do with interpolation.  Texture borders are
a tricky issue, and by clipping away the border, the vtkImageActor
avoids the issue altogether.

My new image rendering classes (in the git master) provide a
BorderOn/BorderOff flag:
http://www.vtk.org/Wiki/VTK/Image_Rendering_Classes

 - David

On Tue, Aug 16, 2011 at 8:33 AM, Ben Payne <ben.payne@kitware.com> wrote:
> Hi-
>
> I was recently playing around with measuring pixel coordinates for an
> image, and I found that the dimensions of the image in world space
> were one "pixel" less on each axis than the dimensions of the source
> image.
>
> After turning texture filtering off so that I could count the
> individual pixels, I discovered VTK is clipping all the pixels along
> the borders of the image in half!  Can anyone shed some light on
> what's going on here?  I wasn't expecting the vtkImageActor to clip
> any part of the image with just the default settings.  If this is the
> expected behavior, how do I get VTK to display the full image?
>
> Test and screenshot are attached.
>
> Thanks,
> Ben
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