Emmanuel ROBBE wrote: > > hello, > > following to my previous mail, i've found a solution that could be > eaysily done (maybe?) : > is there a way (plugins) which can only keep the values > 0 of a scalar > results and replace the others by 0. ? Same for the values <0 ?
Yes, you could use the CutMap plugin (with A=0 and ExtractVolume=1 or -1) to split the view (or the ExtractElements if you do not want to split the elements) > this way by using this plugin on the eigenvalues, you can create to > results : one for the positiv values, the others fot the negativ ones. > And then by using the "evaluate" plugin and multiply theses fields with > the eigenvectors, you can create two fields of eigenvectors > corresponding to the positive values and negatives values. > > regards, > > Emmanuel ROBBE > > ----- Réacheminé par Emmanuel ROBBE/CNEH/DE/EDFGDF/FR le 17/10/2008 > 17:21 ----- > *Emmanuel ROBBE* > > 17/10/2008 16:41 > > > Pour : [email protected] > cc : > Objet : eigenvalue + eigenvectors > > > > hello, > > I'm currently working with gmsh in order to view the results of some > mechanicals problems solved with Code_Aster. First of all, i want to > congratulate you for the very good job you've done with you software : > every time I'm using it, I 'm impressed with the hign number of ways to > draw and use the results of the calculation. > > In order to understand the behaviour of some concrete structure, i'm > using the plugins "eigenvalues" and "eigenvectors" in order to view the > main stress direction / vectors in the structure. Usually, i run the > eigenvectors plugins on the stress tensor with the option 'scale by > eigenvalue' but unfortunatly, with this methode, you can not know > anymore if the value is positiv or negativ, wich is very interesting for > us in order to know if there is traction or not. > > The idea is to be able to represent the eigenvectors with a line with > the followings properties > - the direction is the one of the vectors (which is already given by > eigenvectors) > - the size is related to the value > - the colors depends of the value : for exemple green color for positiv > value, and red for negativ. This last point can ben easily done by > choosing a custom ange with 2 intervals > So, it's a sort of mix between eigenvectors and eigenvalue : this last > option is keeping the information of the sign of the value. > I'm currently trying to use some operation with the plugins existing in > order to do it, without success for the moment. > > With this tool, you can very easily and quicky see the way the force are > crossing the structure and where are the weak point. > > I hope you will me able to help me. Sorry for the poor english, it would > have be more easy for me to write in french. :) > > regards, > > Emmanuel ROBBE > > ps : actually, i've got some others questions about this type of > results's visualization . Let me know if you are interesting. > > > > > > > > > ------------------------------------------------------------------------ > > _______________________________________________ > 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
