[vtkusers] Setting VOI in a circular manner

[David Gobbi]

You can probably do this with two circular ROIs and two
vtkImageStencil filters, one after the other.  Set ReverseStencilOn()
for the second fllter.

On Sun, Apr 21, 2013 at 6:05 PM, Hayden Smith <s_hayden_28 at yahoo.com> wrote:
> Hello,
>      Thank you very much. I have been able to cut a circular portion from
> the image and construct a polydata using your suggestion. Now suppose I have
> set two circular ROIs one inside another in a cylindrical manner and I only
> want to visualize the cylindrical portion, could any one suggest me how that
> can be done.
>     Or is there any method available in VTK about cutting out a cylindrical
> portion from the center of an object.
>
> Thank in advance.
>
> Regards,
> Hayden.
> From: David Gobbi <david.gobbi at gmail.com>
> To: Hayden Smith <s_hayden_28 at yahoo.com>
> Cc: "vtkusers at vtk.org" <vtkusers at vtk.org>
> Sent: Sunday, April 21, 2013 10:13 AM
> Subject: Re: [vtkusers] Setting VOI in a circular manner
>
> Hi Hayden,
>
> The vtkROIStencilSource can generate a circular ROI for an image that
> some of the other image filters can use, e.g. vtkImageStencil can
> black out all pixels that are outside of the ROI.
>
> - David
>
> On Sun, Apr 21, 2013 at 8:58 AM, Hayden Smith <s_hayden_28 at yahoo.com> wrote:
>> Dear VTK users,
>>        I would like to know while using vtkImageReader, is it  possible to
>> set VOI in a circular manner from the center of image? Current
>> implementation shows setting of VOI in a rectangle.
>>
>> Thanks and regards,
>> Hayden.
>
>