[Paraview] csv to geometry (was: paraview novice attempts 1st viz)

[David E DeMarle]

If the values are in the form of an n x m matrix, perhaps we could
make an n column by m row spreadsheet. The column headers can be given
labels and if three of those are POINT_X, POINT_Y, POINT_Z then the
output would become a pointset. The rest of the columns would be point
data values.

Similar controls would let the user specify the geometry for the
structured data types.

cheers
Dave

On 10/3/07, Moreland, Kenneth <kmorel at sandia.gov> wrote:
>
>
>
>
> You are not the first person to ask about this.  I was going to bring up to
> the development team possible ways of deriving geometric data from table/csv
> data.  My thought was to have a simple filter that allowed the user to
> identify columns in a table and then produce a poly data containing the
> points.  From there you could apply other filters (such as Delaunay
> triangulation) to construct a topology.
>
>
>
> Do you (or anyone else) have an opinion on how to interpret tables as
> geometry?
>
>
>
> -Ken
>
>
>
>
>  ________________________________
>
>
> From: fredrikaustin [mailto:fredrikaustin at yahoo.com]
>  Sent: Wednesday, October 03, 2007 10:15 AM
>  To: Moreland, Kenneth; paraview at paraview.org
>  Subject: RE: [Paraview] paraview novice attempts 1st viz
>
>
>
> Thanks for the reply, Ken.
>
>  Of course I know paraview cannot interpret the data; perhaps I should have
> said "I was looking for a way to tell paraview that I have three columns of
> data, and that they correspond to points in x,y,z space respectively.
> Please plot the data".  This is a simple enough request, provides all the
> information necessary, but I could not find any UI that seemed designed for
> this simple purpose.
>
>  If there is not a simple way to plot such csv 3d data (as points in space,
> as a surface, etc), I would think there should be.  It seems a lot of data
> would start in this very straight-forward format.
>
>  -thomas blom
>
>  "Moreland, Kenneth" <kmorel at sandia.gov> wrote:
>
>
> Sorry Thomas, but you are asking for the impossible.  You cannot expect
> ParaView to magically apply semantic meaning to the columns of your data and
> generate a topology that is not nonsense (at least, not without a lot of
> help).  You have asked ParaView to read in a table (a csv holds a table of
> data, no more, no less) and that is exactly what ParaView has done.  You can
> view the data in a spreadsheet-type view and you can plot the columns of
> data.
>
>
>
>
>
> You should use a data format that gives the topological nature of your data.
>  If your data is arranged in a 2D grid, you can store the data in a simple
> image format.  The simplest image format is just a 2D array written out as
> binary data to a file (read in with the "Raw (binary) Files" reader).
> ParaView also reads in .png files and it's pretty easy to extend it to read
> other image files.
>
>
>
>
>
> You can also stuff your data into VTK Legacy File format.  This is a simple
> file format that supports most of the types of data that VTK can handle and
> is pretty easy to build by hand.  You can get information about hat format
> from the VTK User's Guide or in the following link.
>
>
>
>
>
> http://www.vtk.org/pdf/file-formats.pdf
>
>
>
>
>
> -Ken
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>
>  ________________________________
>
>
>
> From: paraview-bounces+kmorel=sandia.gov at paraview.org
> [mailto:paraview-bounces+kmorel=sandia.gov at paraview.org] On
> Behalf Of fredrikaustin
>  Sent: Wednesday, October 03, 2007 7:14 AM
>  To: paraview at paraview.org
>  Subject: [Paraview] paraview novice attempts 1st viz
>
>
>
>
>
> Hello all,
>
>  I'm having a difficult time viewing what must be the simplest data set
> possible.  I have a csv file that includes 3 columns of numbers which I'd
> like to view as 'elevation' type data: 1st two columns give x & y coord
> (regular, though step-size for x and y are different), and 3rd column gives
> a height (the data is actually error vs. 2 different params).   I can open
> the file, and  see that it has read the columns of data correctly, but can't
> get a plot of this surface.
>
>  Seems this should be simple to view, but after blundering around the
> interface for too long, it is not as obvious as one would hope.
>
>  Thanks,
>  Thomas Blom
>
>
>
>  ________________________________
>
>
>
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