[vtk-developers] A possible Ensight bug?

John Biddiscombe biddisco at cscs.ch
Wed Apr 26 07:16:58 EDT 2006

I'm reading particles from an ensight file and I've been noticing that I 
get nasty effects. After a lengthy bit of debugging, I find that for 
this example below with 100000 particles, the points are generated 
correctly, but the Vertex Cells are numbererd 1-100000 instead of 0 to 
99999, which means that the final point in the list is garbage.

Can anyone confirm is this is an Ensight bug, or perhaps, the input file 
(extract below) is numbered incorrectly

Particle positions dataset in Ensight format
particle coordinates
        1-8.85646E-02-1.17152E-01 2.53629E-02
        2-8.94967E-02-1.16437E-01 8.30091E-03
        3-1.18068E-01-8.73709E-02 2.25589E-02
        4-1.26608E-01-7.45923E-02 3.06231E-02
        5-1.25651E-01-7.60931E-02 2.42047E-02
        6-1.21370E-01-8.28119E-02 1.69088E-02
        7-1.32129E-01-6.42284E-02 3.28655E-02
        8-1.32633E-01-6.32604E-02 2.69657E-02
        9-1.32304E-01-5.13977E-02 2.71431E-02
       10-1.36591E-01-5.40008E-02 3.04352E-02
... for another 99989 points

I'm worried because Ensight is used so often around here that there 
can't really be a bug in the reader - and if the input file is wrong 
then I have to renumber loads of data files. However, a reader should 
never generate cellIDs that are larger than the input point list, so 
there is a bug of some kind (at least not reporting an input file error?)

Anyone have any Insight on this (no pun intended!)


John Biddiscombe,                            email:biddisco @ cscs.ch
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82

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