Many thanks for the information, this is exactly what I was looking for.
Cheers,
-Erik
On 03/05/2012 12:42 PM, David E DeMarle wrote:
I agree with John.
See VTK/Parallel/vtkVPICReader.cxx for an example.
David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909
On Mon, Mar 5, 2012 at 2:34 PM, Biddiscombe, John A.<[email protected]> wrote:
Erik,
I'd try 3, but instead of using sub extents (which I might have misunderstood
what that implies), I'd use the TableExtentTranslator so that each piece is
mapped to the already computed extents that you saved your data using.
Essentially, you already have a mapping between pieces and extents, you can set
these up in the TableExtentTranslator and then when the downstream code
requests extents, they'll be calculated based on the values you've setup. Even
though the pipeline requests a structured VTK_3D_EXTENT from your reader, the
values in that Extent are calculated based on the mpi rank (piece number), so
by fooling it with a custom extent translator, all should work (note that I say
should, because I've used my own custom extent translator, but not the table
extent trans so I'm guessing - when Dave DeM reads this he'll either put us
right, or possibly concur).
JB
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Erik Wilson
Sent: 05 March 2012 17:22
To: [email protected]
Subject: [Paraview] Multipiece Structured Dataset questions
Hello all,
I am attempting to develop a Paraview plugin to read in parallel a multipiece
structured dataset through a custom I/O library. Since our data is already
broken up into pieces it would be nice to use a grid type which has a
DATA_EXTENT_TYPE of VTK_PIECES_EXTENT, otherwise when using VTK_3D_EXTENT extra
code will need to be created to calculate and subtract sub-extents such as seen
in vtkXMLPStructuredDataReader. There are three different options I am
considering for developing this reader:
1) Use an Unstructured Grid
Simply translate our structured grid into a vtkUnstructuredGrid using
Hexahedron cells. Will unstructured grids be as efficient as structured grids
for operations such as cut planes and streamlines, or are there any efficiency
disadvantages to using unstructured grids in general?
2) Subclass Structured Grid
Create a subclass of vtkStructuredGrid which uses has a DATA_EXTENT_TYPE of
VTK_PIECES_EXTENT. Is this even feasible, or any other issues?
3) Use a Structured Grid
Just write the code to calculate and subtract 3d sub-extents, better than above
options?
Any feedback or advice is greatly appreciated.
Thanks,
-Erik
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