[Gmsh] Gmsh v1.58.0 automatically quit during adding new surface

[Christophe Geuzaine]

zhoujun wrote:
> Dear professor,
>  
> I am a student new to Gmsh.
> My OS is WinXP SP2,current Gmsh version is 
> 1.58.0.(package:gmsh-1.58.0-Windows downloaded from 
> http://www.geuz.org/gmsh/ on Jan. 10th 2005)
>  
> When I was using Gmsh to draw a simple geometry which is a 3D cube like 
> shape with the exception that the value of height( Z axis value) is very 
> small compared with both the width and length, there was some unpleasant 
> thing happened. During the "Add elements" process (I mean when adding 
> new lines and surfaces),I had to use the "Shift key & mouse" to zoom the 
> corresponding parts in case of that I was able to choose the very short 
> lines that I wanted.However, during the process, Gmsh automatically 
> qiuted without any warning message, after that I had to restart Gmsh, 
> the same thing happened again several times.
>  

It might be a bug in the Windows OpenGL driver, which does not like it
when floats overflow in the scaling matrix... The best solution is to
follow the advice I gave you in my previous mail, i.e., define your
geometry in a parametric way, and set the thickness parameter to a
larger value for visualization.

> I am wondering what was the reason,since I only have one "Cygwin1.dll"on 
> my system,(but I didnot work under the /home/user/directory instead of 
> working under the directoy on cygdrive/c/ where the Gmsh.exe exsits.). 
> Would you mind teaching me what is the possible reason and how to deal 
> with it.
>  
> Frankly speaking, Gmsh is a perfect package for drawing and meshing,the 
> working process are both intuitive and heuristic even though I have no 
> experience on CAD system. I hope if flexiable zoom function will be 
> added to the GUI menu in the future version and it zooms the  region 
> only necessary. At the same time, I want to read part of the *.msh file 
> info. to generate a new text based mesh info. file for my program. I 
> read the Gmsh instruction manual and understood the meaning of 
> differient byte-segment in the .msh file. Is there somewhat simple 
> method to extract only the node coordinate info. and final mesh element 
> info by using Java.Would you mind giving me some advices.

For an example of a C++ routine that read a .msh file, have a look at
gmsh/utils/mshsort.cpp in the source distribution.

Christophe

-- 
Christophe Geuzaine
Applied and Computational Mathematics, Caltech
geuzaine at acm.caltech.edu - http://geuz.org