[Paraview] Which polygon file reader in Paraview has interface to show/hide separate segments?

[Samuel Key]

Jimmy,

I have attached a file named 'fmavto.pvd' that is an ASCII-text file. It 
is a meta-file that references a series of XML-formatted *.vtu files.

ParaView reads the *.pvd file and then knows how to "assemble" the files 
referenced within the *.pvd file. The important key-words in the *.pvd 
files are 'timestep=...' and 'file=...' Note that the individual *.vtu 
files contain the data needed for a displayable graphics object.

The key-word 'name=...' is gratuitous user-information. The key-word 
'name=...' for a couple of ParaView versions around 2007 would pass this 
user-information to the Extract Block filter; currently (PV version 
4.0.1) the ASCII-text strings are no longer passed to the Extract Block 
filter.

However, the Extract Block filter does reflect the structure implied by 
the *.pvd file; the filter simply uses the ubiquitous and 
not-very-helpful C-language off-set addresses of 0,1,2,3,... for the 
block names.

Because of the large number of ASCII-text files that can be generated in 
a transient dynamic simulation with multiple material domains using the 
vtk-formats, sometime back I switched to the EnSight binary-formatted 
output. In this format it is possible to provide names that will appear 
in the Extract Block filter.

Hope this helps,

Regards,

Sam Key

On 10/7/2013 8:35 PM, Jimmy Chen wrote:
> Samuel,
>
> Thank you very much for the quick reply.  I tried your EnSight example
> and could select different polygons by using "Extract Blocks" filter.
> VTK's example EnSight datasets also allows doing so.
>
> Besides, *.vtp or *.pvtp files are not working for me.   What content
> should be put into vtp files to enable Paraview "Extract Blocks"?  If
> you also have a working vtp example that will be very helpful.
>
> Thanks and best regards,
> Jimmy
>
> -------------------------------------------------------------
> Date: Mon, 07 Oct 2013 09:03:40 -0600
> From: Samuel Key <samuelkey at bresnan.net>
> Subject: Re: [Paraview] Which polygon file reader in Paraview has
>          interface to show/hide separate segments?
> To: paraview at paraview.org
> Message-ID: <5252CD4C.7090805 at bresnan.net>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>
> Jimmy,
>
> I have had success with two different ParaView readers doing what you
> have described.
>
> It is material domains that I want to examine as distinct. However,
> ParaView does not care if it is a serially-generated set of material
> domain, a set of processor domain results, or any criterion you want to
> use. Each domain needs to be a "displayable graphics object."
>
> Case(1) *.vtp XML format
>
> Case(2) EnSight Gold format using that format's Part-construct.
>
> In either case, ParaView's Extract Group filter allows one to select any
> combination of domains to display. Multiple extracted sub-domains can
> appear together in one window and/or in separate windows.
>
> A small file that will let you explore this capability is attached.
>
> Samuel W Key
> FMA Development, LLC
> 1005 39th Ave NE
> Great Falls, Montana 59404
> USA
>
>
>
> On 10/6/2013 9:14 PM, Jimmy Chen wrote:
>> Hello,
>>
>> We generate several segments of polygonal meshes and our client wants
>> to store them into a single file and to view on Paraview.  Since the
>> data contains several pre-segmented mesh pieces, they want to view
>> each piece separately in Paraview. Is there a file format supporting
>> composite datasets and has a Paraview interface to show some of them?
>>
>> We have looked into .vtp and .pvtp formats.
>> For .vtp XML format, although we can store different segment in
>> different <piece> tags, Paraview seem to regard them as one piece of
>> data.
>> For .pvtp format, each component is stored into a different file,
>> which is not what our client want.
>>
>> Although we can always create our reader plugin for Paraview, I am
>> wondering whether there already exists this kind of file format saving
>> segments in one file, with a segment-selectable Paraview interface.
>>
>>
>> Thanks and have a nice day.
>> Jimmy Chen
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