[Gmsh] compute volume and color physical

[GUITON Martin]

Dear gmsh contributors,

First, I wonder if there is a possibility with gmsh to compute the total surface of 2D meshes physical groups (volume for 3D) or the total surface of a mesh ? This is because I need to compute the total surface of a deformed configuration.   

My second problem is to merge several meshes with a different color for each of them. Actually I tried to use the physical number with for the first mesh : 
$ELM
7679
1 15 201 3 1 2
2 15 200 52 1 8
3 15 203 53 1 9
4 15 202 72 1 12
5 1 800 2 2 1 15
6 1 800 2 2 15 16
7 1 800 2 2 16 17
8 1 800 2 2 17 18
9 1 800 2 2 18 19
etc.. 

and for the second one:
$ELM
7679    
 1        1       500       47        2 15      1      
 2        1       500       47        2 16      15     
 3        1       500       47        2 17      16     
 4        1       500       47        2 18      17     
 5        1       500       47        2 19      18     
etc.. 

It is possible to select with visibility the 2 physical groups 500 and 800 which are as I want. Unfortunately, if I use the option COLOR for PHYSICAL_GROUPS, the two groups are affected by the same color (that of ZERO). To complicate, I tried also the following format for the second mesh and it works fine (but I would like to be able to work with a different group number than 2). 
$ELM
7679    
 1        1      2       500        2 15      1      
 2        1      2       500        2 16      15     
 3        1      2       500        2 17      16     
 4        1      2       500        2 18      17     
 5        1      2       500        2 19      18     
 6        1      2       500        2 20      19    

Thank you very much for you help.

Martin GUITON

Research Scientist
IFP-Geologie 1-4 Avenue Bois Preau
92852 Rueil-Malmaison FRANCE 
tel: +33 (1) 47 52 63 69

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