[Gmsh] python-api: Problem with signed line-tags with the OCC

[Christophe Geuzaine]

> On 17 Jul 2018, at 16:36, Martin Baun <mar.baun at gmail.com> wrote:
> 
> Hallo,
> 
> with the following example I got an OCC error "Error   : Unknown OpenCASCADE curve with tag -4". It seems the is a problem with the sign. The example works if I use the 'geo' kernel. It also works if I use the occ kernel and rewrite this example as a *.geo file. 
> Is this a problem with the python-api?

This is now fixed (code and documentation) - the OCC kernel does not actually treat negative tags; the code now simply ignores the sign.

> 
> Best regards
> Martin
> 
> 
> 
> 
> import sys
> sys.path.append('/home/Werkzeuge/gmsh/20180705/build')
> import gmsh
> 
> model = gmsh.model
> factory = model.occ     # do not works
> # factory = model.geo   # works
> 
> gmsh.initialize(sys.argv)
> gmsh.option.setNumber("General.Terminal", 1)
> model.add("LineLoop")
> 
> 
> lcar = 0.3
> p1 = factory.addPoint(0, 0, 0, lcar)
> p2 = factory.addPoint(1, 0, 0, lcar)
> p3 = factory.addPoint(1, 1, 0, lcar)
> p4 = factory.addPoint(0, 1, 0, lcar)
> l1 = factory.addLine(p1, p2)
> l2 = factory.addLine(p2, p3)
> l3 = factory.addLine(p3, p4)
> l4 = factory.addLine(p1, p4)  # reverse
> ll = factory.addCurveLoop([l1, l2, l3, -l4])
> s = factory.addPlaneSurface([ll])
> 
> 
> factory.synchronize()
> model.mesh.generate(2)
> gmsh.write("LineLoop.msh")
> gmsh.write("LineLoop.geo_unrolled")
> gmsh.finalize()
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

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