> On 23 Mar 2015, at 21:40, Simone GREMMO [531257] <[email protected]> > wrote: > > Hello, > I have a question about the way the prescribed mesh size is imposed when > meshing an edge: in function LC_MVertex_PNTS(GEntity *ge, double U, double V) > in file ./Mesh/BackgroundMesh.cpp that is used to set l2 (the characteristic > length from points), it is said that if prescribed mesh size at the edge > extremities is GREATER than 1e22, then lc=referenceLength / 10; where the > referenceLength is the diagonal of the domain bounding box. > > In the sources there is already a FIXME note (// FIXME we might want to > remove this to make all lc treatment consistent), but I would like to > understand from where this arbitrary size comes from. How to ensure that the > results is always the expected one? > I would not expect that the resulting mesh depends on the domain bounding-box > size, or that using 1e22 or 1e21 influences the result . >
Indeed, this is a little bit of a "hack". If no characteristic mesh sizes are provided, the default size is 1e22 (it's arbitrary large; it should actually be something like MAX_FLOAT). In that case, in order to still get a mesh that is "reasonable", we set the target element size to "10 elements in the domain". > Thanks for your explanations, > > Regards, > Simone > _______________________________________________ > gmsh mailing list > [email protected] > http://www.geuz.org/mailman/listinfo/gmsh -- Prof. Christophe Geuzaine University of Liege, Electrical Engineering and Computer Science http://www.montefiore.ulg.ac.be/~geuzaine _______________________________________________ gmsh mailing list [email protected] http://www.geuz.org/mailman/listinfo/gmsh
