[Paraview] Data range problem

Tue Oct 14 17:16:15 EDT 2008

Hi Berk

Thanks for the suggestion. Would I be right in saying that the data in the lookup table part have to be in a specific format i.e. 3 rows of 9 floats in your example? Is there a rule of thumb about the layout of the lookout table?

I think the file format is fine for smallish data volumes but could be a lot of work if it's a large dataset. Any possibility that a future release will allow the user to load a CSV spreadsheet file and generate data volumes directly ?

Thanks

Lester

> Date: Tue, 14 Oct 2008 12:06:59 -0400> From: berk.geveci at kitware.com> To: lester_anderson1963 at hotmail.com> Subject: Re: [Paraview] Data range problem> CC: dominik at itis.ethz.ch; paraview at paraview.org> > Lester,> > Your best choice is probably going to be VTK ascii format. It is a> very simple format. A uniform rectilinear grid would look like:> > # vtk DataFile Version 3.0> vtk output> ASCII> DATASET STRUCTURED_POINTS> DIMENSIONS 3 3 3> SPACING 1 1 1> ORIGIN 0 0 0> POINT_DATA 27> SCALARS RTData float> LOOKUP_TABLE default> 60.7635 107.555 80.5241 85.9694 156.706 105.73 37.3531 84.1445 57.1137> 100.634 171.37 120.395 149.785 260 169.546 77.2238 147.96 96.9844> 60.7635 107.555 80.5241 85.9694 156.706 105.73 37.3531 84.1445 57.1137> > A curvilinear grid is easy to write as well. The only additional> information needed is the point coordinates.> > More detail can be found here: http://vtk.org/pdf/file-formats.pdf> > -berk> > > On Tue, Oct 14, 2008 at 11:28 AM, Lester Anderson> <lester_anderson1963 at hotmail.com> wrote:> > Hi Domink> >> > Sounds like I do't know what the Paraview definition of plain raw format is.> > I have attached the simple test file - just 3 points with a scalar value. It> > has a header section but paraview should recognise that anyway.> >> > Anything look odd in there?> >> > Thanks> >> > Lester> >> >> From: dominik at itis.ethz.ch> >> To: lester_anderson1963 at hotmail.com> >> Subject: Re: [Paraview] Data range problem> >> Date: Tue, 14 Oct 2008 08:25:22 +0200> >> CC: paraview at paraview.org> >>> >> Hi, if you have tried all datatypes in Paraview then chances are very high> >> your data is not plain raw format but includes some header etc. I don't> >> have> >> anything at hand in raw format but would be surprized there is none in VTK> >> example data.> >> PS. I think some little programming might often help you out. You might> >> want> >> to look at python if you want to keep it at minimum (plus it integrates> >> with> >> VTK and PV).> >>> >> Dominik> >>> >> On Monday 13 October 2008 11:00:22 pm Lester Anderson wrote:> >> > Hi Dominik> >> >> >> > I do not have Matlab to test, but there should be no issue of> >> > 'endianness'> >> > as I work on Windows and use PC-based editors. The file type does not> >> > seem> >> > to be the issue, but more the data within (just guessing).> >> >> >> > I have tried all the data type variants without success: other than> >> > being> >> > able to read the points in.> >> >> >> > Didn't seem to make much odds using xyzc (0 1 2 3) or (0.0 1.0 2.0 3.0)> >> >> >> > Do you have an example raw data file? It would be so much more> >> > convenient> >> > to be able to load up data via CSV (but that currently doesn't work).> >> >> >> > What would be the best way of loading data into Paraview that does not> >> > require any programming or major work?> >> >> >> > Lester > From: dominik at itis.ethz.ch> To:> >> > lester_anderson1963 at hotmail.com>> >> > Subject: Re: [Paraview] Data range problem> Date: Mon, 13 Oct 2008> >> > 09:03:58> >> > +0200> CC: paraview at paraview.org> > A simple test you could do is to try> >> > to> >> > read the raw binary file into matlab. > there you can also specify both> >> > endianness and precision (double, int, etc.). > I bet the reason you do> >> > not> >> > get the right numbers is that you import a wrong > datatype.> > Dominik>> >> > >> >> > On Sunday 12 October 2008 11:54:36 pm Lester Anderson wrote:> > I have> >> > used> >> > a plain text editor to write a simple ascii structure, and also> > tried> >> > using Surfer (Golden Sofware) to prepare .DAT file do the same (eg> >> >> > space> >> > delimited or comma delimited). Basically I am testing a simple ascii> >> >> > text file structure and it ckearly loads the data (points plot where> >> > they>> >> > > should be), but it is unclear how to set the data type. If we are> >> > dealing> > with positive an negative numbers then I assume that means we> >> > need a signed> > integer or real number type.> >> > Perhaps if you could> >> > show an example data file that works in the raw import> > as an> >> > xyz,value> >> > it might be clearer as to how to proceed. Thanks for the> > help, I'm> >> > sure> >> > I'm missing something very obvious here just can't put my> > finger on> >> > it> >> > yet!> >> > Lester> From: dominik at itis.ethz.ch> To:> >> > lester_anderson1963 at hotmail.com>> > Subject: Re: [Paraview] Data range> >> > problem> Date: Sun, 12 Oct 2008 20:58:52> > +0200> CC:> >> > paraview at paraview.org> > How do you write the data to a file?> >> >> >> > Dominik> > On Sunday 12 October 2008 02:36:27 pm Lester Anderson wrote:>> >> > >>> >> > > Hi Dominik> >> > So how can I define the correct datatype? For> >> > > example,> >> > if> > it is just signed> > integers like the test I made (-5 to +5), or> >> > real> > numbers (eg -2.54 to> > 5.55). I set the file to LittleEndian as> >> > I'm on a> > PC> >> > Importing the data via the raw format is working,> >> > it's> >> > just> > working out the> > correct type to make it work!> >> > Thanks> >> > for> >> > the help>> > >> > Lester > From: dominik at itis.ethz.ch> To:> >> > paraview at paraview.org>> > Subject:> > Re: [Paraview] Data range problem>> >> > Date: Sun, 12 Oct 2008> > 12:17:03 +0200>> > CC:> >> > lester_anderson1963 at hotmail.com> > You most likely> > imposed wrong> >> >> > datatype when importing the raw stuff.> > Dominik> > On> > Sunday 12> >> > October> > 2008 10:55:18 am Lester Anderson wrote:> > Hello> >> >> > I> >> > have> >> > just created> > a test as a set of random values:> >> >> >> >> >> >> >> > 'x','y','z','grav'0,0,0,20,0,1,30,0,2,50,1,0,-10.1.1,-30,1,2,-50.2.0,10,2,1> >> >> >> >>> >> >> >> >> >> > > >,20,2,2,51,0,0,-31,0,1,-41,0,2,-11,1,0,01.1.1,-21,1,2,21.2.0,11,2,1-11,2,2> >> >> >> >,0>> >> > >2,0,0,02,0,1-52,0,2,-42,1,0,-12.1.1,12,1,2,22.2.0,52,2,1,42,2,2,4>> >> >> > > >>> >> > >> > It is a cube of point values (x,y,z) with a test scalar (grav).> >> > >> > The> >> >> > data> >> > range of 'grav' is -5 to +5> >> > I imported the data into> >> >> > Paraview as a> > raw(binary) format file which seemed> > ok, with the> >> >> > extents: 0 to 2 on> > (x,y,z). The result was a Image (uniform> >> >> >> > Rectilinear Grid)> >> > When I> > look at the data information it shows> >> > the> > data range as 2573, 13612> >> > (min,max) - what is going on> >> > here?>> >> > >> >> > Thanks> >> > Lester> >> >> >> >> > _________________________________________________________________> >> >> > Make>> >> > > a> > mini you and download it into Windows Live Messenger> >> >> >> >> > http://clk.atdmt.com/UKM/go/111354029/direct/01/> > > > -- > Dominik> >>> >> > >> >> > Szczerba, Ph.D.> Computational Physics Group> Foundation for Research> >> > on>> >> > >> > Information Technologies in Society> http://www.itis.ethz.ch> >> >> >> > _________________________________________________________________> >> >> > Make> >> > a> > mini you and download it into Windows Live Messenger> >> >> >> > http://clk.atdmt.com/UKM/go/111354029/direct/01/> > > > -- > Dominik> >> >> > Szczerba, Ph.D.> Computational Physics Group> Foundation for Research> >> > on> >> >> > Information Technologies in Society> http://www.itis.ethz.ch> >> >> > _________________________________________________________________> >> >> > Make a> >> > mini you and download it into Windows Live Messenger> >> >> > http://clk.atdmt.com/UKM/go/111354029/direct/01/> > > > -- > Dominik> >> > Szczerba, Ph.D.> Computational Physics Group> Foundation for Research on> >> > Information Technologies in Society> http://www.itis.ethz.ch> >> > _________________________________________________________________> >> > Get all your favourite content with the slick new MSN Toolbar - FREE> >> > http://clk.atdmt.com/UKM/go/111354027/direct/01/> >>> >>> >>> >> --> >> Dominik Szczerba, Ph.D.> >> Computational Physics Group> >> Foundation for Research on Information Technologies in Society> >> http://www.itis.ethz.ch> >> >> > ________________________________> > Try Facebook in Windows Live Messenger! Try it Now!> > _______________________________________________> > ParaView mailing list> > ParaView at paraview.org> > http://www.paraview.org/mailman/listinfo/paraview> >> >
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