[Gmsh] post processing indexes

[Christophe Geuzaine]

John Borchardt wrote:
> Hello and thank you for gmsh!
> 
> I am using gmsh to view several kinds of data at once (e.g., electric 
> currents and electromagnetic fields overlaid on the same geometry).  
> Oftentimes, the two different datasets need a different color scale.  
> I'd like to put that data into their respective *.pos files, however, I 
> am not sure how index the views properly. 
> 
> The problem is that you don't know how many data sets there will be or 
> what order they'll occur on the command line, so you can't (evidently) 
> just hard-code an index into each *.pos file.
> 
> Example: if file1 contained:
> 
> View[0].RangeType = 2;
> View[0].CustomMax = 20;
> View[0].CustomMin = 0;
> 
> and if file2 contained:
> 
> View[1].RangeType = 2;
> View[1].CustomMax = 10;
> View[1].CustomMin = -10;
> 
> then the indexes would only refer to the correct data views when gmsh is 
> invoked as
> 
> gmsh file1.pos file2.pos
> 
> and things like:
> 
> gmsh file2.pos file1.pos
> gmsh file2.pos
> 
> would not work as desired.
> 
> So I'm wondering if it's possible to fix my problem; 
> PostProcessing.NbViews doesn't quite seem to do what I want, it only 
> seems to give the total number of data sets loaded, and not the number 
> of the dataset that gmsh is currently parsing.
> 

Hello John - With .pos files here's what I would do:

<<file1.pos>>

View "1" {
ST(0,0,0, 1,0,0, 0,1,0){-30,0,30};
};

n = PostProcessing.NbViews - 1;
View[n].RangeType = 2;
View[n].CustomMax = 20;
View[n].CustomMin = 0;


<<file2.pos>>

View "2" {
ST(0,0,0, 1,0,0, 0,1,0){-30,0,30};
};

n = PostProcessing.NbViews - 1;
View[n].RangeType = 2;
View[n].CustomMax = 10;
View[n].CustomMin = -10;



With .msh files, you could use the same trick, except that you would 
need to put the options in separate files, loaded in sequence ("gmsh 
file1.msh file1.opt file2.msh file2.opt").


> Thanks for all your help in advance!  Please forgive me if the answer is 
> already out there -- I looked at the manual, the t8.geo and t9.geo files 
> and I did a search on the mail list archives but did not see anything 
> that would help me.
> 
> --John
> 
> 
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine