[Paraview] Extracting closed surfaces from an isosurface

[Andy Bauer]

Hi Tim,

You can try the Connectivity filter to create RegionId point and cell data
arrays to each blob set of cells. From there threshold can be used to pick
out individual blobs. You may need to use the merge blocks filter first
though if you're starting from a multiblock data set. I'm not sure if this
will work in parallel since the Connectivity filter could get
algorithmically complex. If you try it in parallel, I'd be interested in
knowing if it works or not.

Regards,
Andy


On Fri, Aug 1, 2014 at 4:56 PM, Tim Gallagher <tim.gallagher at gatech.edu>
wrote:

> Hi all,
>
> I am working on a programmable filter and I want to extract and analyze
> data generated by an isosurface. I'm having a hard time coming up with
> generic data to represent what I mean, but I'll try to describe it.
>
> I run my data and generate an isosurface for a single value. The resulting
> isosurface generates disconnected/independent blobs in space. I've attached
> an image of what it looks like. I would like to take each of those
> independent surfaces and manipulate them (compute volume of each, or
> maximum cross sectional area, or find a central axis, or delete them based
> on the computed volume, etc) but I can't figure out how to extract the data
> I need through VTK. I have the vtkPolyData array as well as the normals
> array, but I cannot figure out how to use that information to isolate and
> extract the independent surfaces.
>
> Does anybody have any suggestions or examples I can look at on how to
> manipulate the data?
>
> Thanks,
>
> Tim
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