Hi Firas,
rather than "meaningless" it's probably more "not what you were expecting".
The output of vmtkbranchgeometry is a dataset with only a few datapoints, one
per branch,
whose coordinates have no geometric meaning. It's just a way of storing data
(in fact the
variable is called GeometryData, not Surface).
Anyway, if you output to a file with .dat extension you get a text file
containing something like:
X Y Z Length Curvature Torsion Tortuosity GroupIds
0.0 0.0 0.0 0.973622536889 0.425082864761 -0.0446472699164 0.0102756315705 0.0
0.0 0.0 0.0 1.43302942538 0.386078435843 -1.60755773849 0.0128147969932 2.0
0.0 0.0 0.0 0.434081543474 0.74714836635 0.0 0.00548545895655 3.0
that is, for each non-blanked group you get length, curvature, torsion and
tortuosity.
If you want to project it back to your centerlines, then for the time being
you'll have to
do it manually. However, it would be rather quick to add a Surface output to
the script
with the quantities directly in there.
Hope this answered your question.
Luca
On Nov 20, 2010, at 9:05 PM, Firas Mualla wrote:
> Hi all,
> inside a python file, I have:
>
> tmplt = Template('vmtkbranchgeometry -ifile $branch_file1 -ofile
> $branch_geometry_file1')
> command =
> tmplt.substitute(branch_file1=branch_file,branch_geometry_file1=branch_geometry_file)
> myPype = pypes.PypeRun(command)
>
> the result is empty vtp (0 points, 0 cells).
>
> I've noticed that some array names are not set, so I've set them:
>
> tmplt = Template('vmtkbranchgeometry -ifile $branch_file1
> -radiusarray MaximumInscribedSphereRadius
> -groupidsarray GroupIds
> -blankingarray Blanking
> -ofile $branch_geometry_file1')
>
> the result is a file with (5 points, 5 cells), but they are meaningless.
>
> I am using vmtk 0.9.0 on Win xp, with Python shipped with vmtk. I
> tried also Pypepad, and got the same.
> I checked the input file (branch.vtp) and it contains all necessary arrays!
>
> many thanks in advance
>
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