[Gmsh] Small dimension objects from CAD software - mesh generation problem

[Matija Mraovic]

Hello!

I am trying to generate a mesh for use in freefem++. I am modelling an 
interdigitated electric capacitor, my geometry was designed in CAD 
software.

First I have imported the geometry directly (only for two electrodes) 
and ran the mesh generator. It worked fine and simulation result was 
also fine.

Then i wanted to include the substrate under the electrodes. This 
didn't work, if mesh was generated, the error from FEM was unacceptable. 
Then i
have tried with stripping the geometry file to include just the planar 
projection of electrodes and extrude them, but this also doesn't work.
I'm attaching this in two files (plane.geo, extruded.geo).

I am using milimeter units, i multiply all points with 1e-3 in 
plane.geo file. I tried setting the characteristic length to 1e-1, 
1e-2... and i get
errors about identical points or mostly gmsh crash. My system is 64bit 
Win7.

Please, if someone would be so kind to suggest a solution to this 
problem. Is it maybe because geometry is so strange (eg. 30mm width, 
0.01mm height)?

Thank you.

Best regards.
mm
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