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<DIV><FONT face=Arial size=2>Hello,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>First of all, I'd like to thank you for developping
a tool as Gmsh. I just recently discovered it and I must admit that the program
is very easy to use, performs well in all kind of situation and gives very
satisfying results when it comes to meshes. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Until now, I was using Gmsh to generate 2D meshes
from a geometry I defined using the built-in CAD tool. I'm now trying to import
a more complex 3D geometry in order to build a volumic tetrahedra mesh. This
means that I cannot create the geometry myself and import models from other CAD
tools, such as SolidWorks.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Alas, it seems that I have encountered a bug !
While opening a .STP file, Gmsh 2.00 sent me back to the desktop with this error
message (in gmsh-errors) :</FONT></DIV>
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<HR>
</FONT></DIV>
<DIV><FONT face=Arial size=2><EM>Info : Reading
'C:/Gaël/Mailleurs non structurés/Exemples de Maillages/Cube avec Tore inclu
dedans.STEP'<BR>Fatal : Segmentation violation (invalid memory
reference)</EM></FONT></DIV>
<DIV><FONT face=Arial size=2>
<HR>
</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Then, when importing an IGES file, there is no
volume defined, which implies that no 3D mesh can be created, only 2D elements.
When I try to modify the geometry in order to add a volume (elementary
entities>add>new>volume) by selecting a surface loop, the program
returns :</FONT></DIV>
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</FONT></DIV>
<DIV><FONT face=Arial size=2><EM>Error : Unknown surface
8<BR>Error : Unknown surface 8<BR>Info : Surface
Loop(1) = {8};</EM><BR></DIV>
<DIV>
<HR>
</DIV>
<DIV><BR>This implies that the renumbering of elementary entities from an
imported file is not stable, or not written in the program
memory. Obviously, there is an algorithm that translates imported
features into Gmsh own language. This can be seen when passing the mouse
over the geometry, the dialog bar returns the name of the feature, its
number and the list of features that compose it. </DIV>
<DIV> </DIV>
<DIV>Knowing this, is it possible to easily translate an .igs file
into a .geo file without the 'merge' command ?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I'll keep you informed if I ever come across
another bug or if I have another comment. Thanks again for spending
your time developping this wonderful tool and I hope my comments will
help you improve it even further.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Sincerely,</FONT> </DIV>
<DIV><FONT face=Arial size=2> </DIV></FONT>
<DIV><FONT face=Arial size=2>Gaël de BRESSY<BR> <BR>SERGI Research
Department<BR>186, avenue du Gal de GAULLE<BR>P.O. Box 90 - 78260 ACHERES -
FRANCE<BR>Tel: 33 - 1 39 22 37 18 / Fax: 33 - 1 39 22 48
55<BR>=========================================</FONT></DIV></BODY></HTML>