[Paraview] [EXTERNAL] proper formatting of 2D data

[Cory Quammen]

Is negative spacing really supported in VTK/ParaView? The VTK File
Formats document for legacy data
(http://www.vtk.org/VTK/img/file-formats.pdf) states under the
description of the structured points data:

"The data spacing sx, sy, sz must be greater than 0."

This is apparently not enforced in the reader, however.

Thanks,
Cory

On Fri, Sep 19, 2014 at 1:01 PM, Scott, W Alan <wascott at sandia.gov> wrote:
> Robert,
> I am pretty sure that is a bug.  Mind writing up a bug report?  Also, your description and example file are great.  Be sure to include them in the bug.
>
> Alan
>
> -----Original Message-----
> From: ParaView [mailto:paraview-bounces at paraview.org] On Behalf Of Robert-Zoltan Szasz
> Sent: Friday, September 19, 2014 12:57 AM
> To: paraview at paraview.org
> Subject: [EXTERNAL] [Paraview] proper formatting of 2D data
>
> Hi,
>
> I tried to visualize 2D structured point data when I observed a strange behavior. If the spacing in Y direction is negative, the data is flipped upside-down in 'Slice' representation mode but shown properly as a 'Surface' representation. Tried in v. 4.0.1 and 4.2rc1 on Linux 64 bit.
> Here is a small VTK file to test:
>
> --8<--
> # vtk DataFile Version 2.0
> testing
> ASCII
> DATASET STRUCTURED_POINTS
> DIMENSIONS 3 4 1
> ORIGIN 0.0 0.0 0.0
> SPACING 0.5 -0.75 1.0
> POINT_DATA 12
> SCALARS test float
> LOOKUP_TABLE default
> 0.0
> 1.0
> 2.0
> 1.0
> 2.0
> 3.0
> 2.0
> 3.0
> 4.0
> 3.0
> 4.0
> 5.0
> -->8--
>
> I am wondering if I missed something when formatting the file or if you have any ideas how to avoid this behavior?
> Thanks,
> Robert
>
> --
> Robert-Zoltan Szasz
> Div.Fluid Mechanics                 Tel: +46-46-222 0480
> Dept. Energy Sciences, LTH          Fax: +46-46-222 4717
> Lund University
>
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