[vtkusers] cylindrical ROI

[Dgillard]

Yes, I do need to operate on the pixels eventually, and the way you suggested
is the best way I've found, thank you.

What I've done is use the scaling and positioning methods of a vtkActor
class to display the ROI, and once the user has settled on the ROI enclosing
the data that they want to operate upon, I use the
vtkTransformPolyDataFilter class and transform it with the matrix taken from
the actor:

ROIPolyFilter SetTransform transform
transform SetMatrix [ROIActor GetMatrix]



David Gobbi-3 wrote:
> 
> Hi David,
> 
> Do you want to just mark the ROI with the cylinder, or do you
> want to operate on the pixels with the ROI as well?  If you
> want to do the latter, then you might be better off using
> vtkTransformPolyDataFilter to scale/move the cylinder
> so that you can pull out the geometry of the transformed
> cylinder and use them to create either a stencil or a
> vtkImplicitSelectionLoop.
> 
> See the following examples:
> Hybrid/Testing/Tcl/TestImageStencilWithPolydata.tcl
> Filtering/Testing/Tcl/SelectionLoop.tcl
> 
> I hope that I wasn't off track with what you are trying to do.
> 
>    David
> 
> 
> On Wed, Jul 30, 2008 at 12:59 PM, Dgillard <dgillard at pangeosubsea.com>
> wrote:
>>
>> Turns out that a nice way to do this is to create a circular cylinder
>> with
>> vtkCylinderSource, and then use an actor to scale it's dimensions.
>>
>>
>> Dgillard wrote:
>>>
>>> I've got vtkImageData that I'm sifting through. I'd like to be able to
>>> create a region of interest, preferably an elliptical cylinder.
>>>
>>> I'm thinking of creating the region with vtkQuadric and
>>> vtkContourFilter, but am not certain if this is the best way to go about
>>> doing it. I don't know how to manipulate only the data enclosed by the
>>> ROI, for instance.
>>>
>>> Any tips or suggestions would be greatly appreciated.
>>>
>>> D.G.
>>>
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>>
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