[Gmsh] surface normals: some point inwards, but most point in the negative direction
Christophe Geuzaine
geuzaine at acm.caltech.edu
Thu Nov 21 05:19:17 CET 2002
Matthias G. Imhof wrote:
> I defined a simple rectangular block and noticed that normals in the
> x-direction actually change signs depending on the surface to point into
> the block, while the other normals point in the negative y- or
> z-directions pointing into the block for some surfaces and pointing
> outwards for others.
>
> How can I change this model to have all normals point out of the block?
The only way is to define Physical Surfaces with the appropriate sign,
e.g. "Physical Surface(1) = {23,1,20,3,2,-16};". This will reverse the
orientation of the surface 16 in the output mesh file.
>
> A second question for the same problem. If I generate a quantity by
> duplicate, how can I lates access this quantity? I tried to assign it
> to, e.g., a plane surface but that did not work.
There is unfortunately no way to access that information at the moment
without using the GUI...
Christophe
--
Christophe Geuzaine
Tel: (626) 395-4552 http://www.geuz.org
Fax: (626) 578-0124 mailto:geuzaine at acm.caltech.edu