Hi simon,
sorry I misunderstood your question :) This sounds odd so - I think Luca has
to chime in :)
Daniel
On May 24, 2011 1:22 AM, "Simon Wilson" <s.wils...@uq.edu.au> wrote:
> Daniel,
>
> Thanks for the links. Unfortunately, the Slicer module just finds the
centerline, but doesn't seem to do anything else other than create a Slicer
object from the polydata.
>
> I'm able to extract the centerline using vtkvmtkPolyDataCenterlines, can
extract the branches using vtkvmtkCenterlineBranchExtractor, and even clip
the surface using vtkvmtkPolyDataCenterlineGroupsClipper -- these all work
as advertised, and I'm able to get the results to display inside my VTK
view.
>
> What I'm having trouble now is taking the output of
vtkvmtkCenterlineBranchExtractor and finding which of the branches are
connected to each other. I can find each vtkPolyLine object that represents
each part of the branch, but it seems to me that
vtkvmtkCenterlineUtilities::FindAdjacentCenterlineGroupIds(..) is giving the
wrong results.
>
> Thanks again,
>
> Simon Wilson
>
> (ps sorry for the original double-post)
>
> On 23/05/2011, at 11:43 PM, Daniel Haehn wrote:
>
>> Hi Simon,
>>
>> you should take a look at
>>
>> http://www.vmtk.org/Main/VmtkIn3DSlicer
>> http://www.slicer.org/slicerWiki/index.php/Modules:VMTKCenterlines
>>
>> This is a GUI for the Centerlines Computation as a 3D Slicer module.
>> It is all open source so you could easily get inspired on how to get
>> the centerlines tree:
>>
http://www.nitrc.org/plugins/scmsvn/viewcvs.php/VMTKCenterlines/?root=slicervmtklvlst
>>
>> Cheers,
>> Daniel
>>
>> On Mon, May 23, 2011 at 2:32 AM, Simon Wilson <s.wils...@uq.edu.au>
wrote:
>>> Hi all,
>>>
>>> I've just started working with VMTK again after a long hiatus, and have
started integrating the C++ classes into an application. My goal is to
obtain the centreline topology, so that I can build a UI around this to
allow for interactive segmentation.
>>>
>>> I found the method
vtkvmtkCenterlineUtilities::FindAdjacentCenterlineGroupIds(...), which I
thought would give me the full connected tree, but it doesn't seem to work
that way.
>>>
>>> I have a simple structure of a single vessel that branches into two
smaller vessels in a Y-shape. From this, vtkvmtkCenterlineBranchExtractor
finds a total of 6 segments, but after calling
FindAdjacentCenterlineGroupIds(), two of these branches are "orphaned" --
they have no upstream and no downstream groups. These both correspond to two
parts of one branch, distal to the bifurcation.
>>>
>>> The other oddity I've noticed is that, from the group that has the
bifurcation in it (1 upstream, 2 downstream groups), the branch which has
the two orphaned segments attaches another copy of the proximal part instead
of the orphaned branches. I've noticed there are methods within
vtkvmtkCenterlineUtilities for "unique" group IDs, but I've yet to try this
out.
>>>
>>> In short, how should I go about constructing the topology of the
centerline? Ideally, I just need 3 segments (the common proximal part, and
the two distal branches from the bifurcation), though I can deal with
additional "inter-bifurcation" parts if there's no other way.
>>>
>>> Thanks,
>>>
>>> Simon Wilson
>>>
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