[Paraview] Query about TableToStructuredGrid filter

[Lester Anderson]

Hi Utkarsh

Thanks for the info, I can now see how it works from your sample file. I did have to re-order the entries in my test CSV file in order to get it plotting as a cube and not as a distorted one (with the original format). It does appear that the Table to Structured Grid expects the CSV data to be in a particular order, but it does not seem to be able to handle data values entered in effect randomly, even though the positional information (XYZ) is explicit.

I did apply a quick test on some real data, a few sampled layers as the whole data are quite chunky! Even though I enter the extents of the data properly, it fails with the the same error message. I have attached a zipped data file for you to see, it is only 3 data layers (z=0, -100, -200), with the units in metres (XYZ).

X: 291000 - 321000
Y: 2026000 - 2056000
Z: -200 - 0 (negative to get depth in the right direction!)

I already have the whole dataset as a VTK file (thanks to Berk's help), but this is a useful test of real-world data. The whole dataset forms a volume 30km x 30km x 10km (XYZ) so pretty big!

If you can work out why it is not working on the Table to structure grid, that would be a great help. Table to points is perfectly fine with the extents exactly as expected. As longs as the data are on a regular grid, then Paraview should be able to convert this to a structured grid irrespective of the order of the data points. Perhaps it would be useful to have some clarification on the way Paraview processes the data and whether or not we are expected to preformat the input CSV file.

Thanks

Lester


> Date: Thu, 23 Jul 2009 15:23:51 -0400
> Subject: Re: [Paraview] Query about TableToStructuredGrid filter
> From: utkarsh.ayachit at kitware.com
> To: lester_anderson1963 at hotmail.com
> CC: paraview at paraview.org
> 
> Attached is a sample csv file.
> Since the CSV file has 8 points, we can create a grid  with extents
> (2x2x2). Hence set the Whole Extent on the "Table To Structured Grid"
> filter to be (0, 1, 0, 1, 0, 1). Then choose the columns to use for
> the point coordinates and hit apply.
> 
> I guessing what you are missing is setting of the "Whole Extent" on the panel.
> 
> Utkarsh
> 
> On Thu, Jul 23, 2009 at 11:25 AM, Lester
> Anderson<lester_anderson1963 at hotmail.com> wrote:
> > Hello
> >
> > It is good to see that there is now CSV import functionality, which works
> > fine for displaying points (e.g. using Glyphs), but if you want to do more
> > interesting work, you need a structured grid. The option to take the loaded
> > CSV data and convert it to a Structured Grid is listed (Table to Structure
> > Grid). However, this always fails with the same error message (Windows XP
> > and Vista)
> >
> > ERROR: In ..\..\..\src\VTK\Graphics\vtkTableToStructuredGrid.cxx, line 98
> > vtkPTableToStructuredGrid (0A195768): The input table must have exactly 1
> > rows. Currently it has 8 rows.
> >
> >
> > ERROR: In ..\..\..\src\VTK\Filtering\vtkExecutive.cxx, line 757
> > vtkCompositeDataPipeline (0A1952A0): Algorithm
> > vtkPTableToStructuredGrid(0A195768) returned failure for request:
> > vtkInformation (09987D80)
> >   Debug: Off
> >   Modified Time: 9473124
> >   Reference Count: 1
> >   Registered Events: (none)
> >   Request: REQUEST_DATA
> >   FORWARD_DIRECTION: 0
> >   ALGORITHM_AFTER_FORWARD: 1
> >   FROM_OUTPUT_PORT: 0
> >
> > I have tested this on a multilayer volume and it fails as above: the Table
> > to Points always works. What we want is to have Paraview
> > interpolate the data between the points such that a volume can be sliced
> > etc. Is there a problem with this option?
> >
> > Lester
> >
> >
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