<br><font size=2 face="sans-serif">hello, </font>
<br>
<br><font size=2 face="sans-serif">following to my previous mail, i've found a solution that could be eaysily done (maybe?) : </font>
<br><font size=2 face="sans-serif">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 ?</font>
<br><font size=2 face="sans-serif">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.</font>
<br>
<br><font size=2 face="sans-serif">regards, </font>
<br>
<br><font size=2 face="sans-serif">Emmanuel ROBBE</font>
<br>
<br><font size=1 color=#800080 face="sans-serif">----- Réacheminé par Emmanuel ROBBE/CNEH/DE/EDFGDF/FR le 17/10/2008 17:21 -----</font>
<br>
<table width=100%>
<tr valign=top>
<td>
<td><font size=1 face="sans-serif"><b>Emmanuel ROBBE</b></font>
<p><font size=1 face="sans-serif">17/10/2008 16:41</font>
<br>
<td><font size=1 face="Arial"> </font>
<br><font size=1 face="sans-serif"> Pour : gmsh@geuz.org</font>
<br><font size=1 face="sans-serif"> cc : </font>
<br><font size=1 face="sans-serif"> Objet : eigenvalue + eigenvectors</font></table>
<br>
<br><font size=2 face="sans-serif">hello, </font>
<br>
<br><font size=2 face="sans-serif">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.</font>
<br>
<br><font size=2 face="sans-serif">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.</font>
<br>
<br><font size=2 face="sans-serif">The idea is to be able to represent the eigenvectors with a line with the followings properties</font>
<br><font size=2 face="sans-serif"> - the direction is the one of the vectors (which is already given by eigenvectors)</font>
<br><font size=2 face="sans-serif"> - the size is related to the value</font>
<br><font size=2 face="sans-serif"> - 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</font>
<br><font size=2 face="sans-serif">So, it's a sort of mix between eigenvectors and eigenvalue : this last option is keeping the information of the sign of the value.</font>
<br><font size=2 face="sans-serif">I'm currently trying to use some operation with the plugins existing in order to do it, without success for the moment.</font>
<br>
<br><font size=2 face="sans-serif">With this tool, you can very easily and quicky see the way the force are crossing the structure and where are the weak point.</font>
<br>
<br><font size=2 face="sans-serif">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. :)</font>
<br>
<br><font size=2 face="sans-serif">regards, </font>
<br>
<br><font size=2 face="sans-serif">Emmanuel ROBBE</font>
<br>
<br><font size=2 face="sans-serif">ps : actually, i've got some others questions about this type of results's visualization . Let me know if you are interesting.</font>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>