fixed crash when trying to extrude a discrete surface + minor mods in the faq

Geo/CAD.cpp

-// $Id: CAD.cpp,v 1.80 2005-01-01 19:35:28 geuzaine Exp $
+// $Id: CAD.cpp,v 1.81 2005-02-11 02:27:12 geuzaine Exp $
 //
 // Copyright (C) 1997-2005 C. Geuzaine, J.-F. Remacle
 //
@@ -109,7 +109,11 @@ int compare2Lists(List_T * List1, List_T * List2,
 {
   int i, found;
 
-  if(List_Nbr(List1) != List_Nbr(List2))
+  if(!List_Nbr(List1) && !List_Nbr(List2))
+    return 0;
+
+  if(!List_Nbr(List1) || !List_Nbr(List2) || 
+     (List_Nbr(List1) != List_Nbr(List2)))
     return List_Nbr(List1) - List_Nbr(List2);
   
   List_T *List1Prime = List_Create(List_Nbr(List1), 1, List1->size);

doc/FAQ

-$Id: FAQ,v 1.51 2005-02-04 19:42:26 geuzaine Exp $
+$Id: FAQ,v 1.52 2005-02-11 02:27:13 geuzaine Exp $
 
 This is the Gmsh FAQ
 
@@ -10,11 +10,9 @@ Section 1: The basics
 
 Gmsh is an automatic three-dimensional finite element mesh generator,
 primarily Delaunay, with built-in pre- and post-processing
-facilities. Its primal design goal is to provide a simple meshing tool
-for academic problems with parametric input and advanced visualization
-capabilities.  One of the strengths of Gmsh is its ability to respect
-a characteristic length field for the generation of adapted meshes on
-lines, surfaces and volumes.
+facilities. Its design goal is to provide a simple meshing tool for
+academic problems with parametric input and advanced visualization
+capabilities.
 
 * 1.2 What are the terms and conditions of use?
 
@@ -27,7 +25,7 @@ GNU foundation's web site at http://www.gnu.org.
 Nothing ;-)
 
 (Note that in the US, people tend to pronounce 'Gmsh' as
-'Gee-mesh'. Yeah.)
+'Gee-mesh'. Yeehaa!)
 
 * 1.4 Where can I find more information?
 
@@ -63,7 +61,9 @@ You'll also need the jpeg library if you want to save jpeg images, and
 the libpng and zlib libraries if you want to save png images.
 
 Under Windows, you will need the Cygwin tools and compilers (freely
-available from http://www.cygwin.com).
+available from http://www.cygwin.com), as well as "cygwin-enabled"
+version of FLTK (i.e., you have to configure FLTK with "./configure
+--enable-cygwin").
 
 * 2.4 How to I compile Gmsh?
 
@@ -141,12 +141,12 @@ old algorithm anymore.
 
 Send us your geometry, and we will investigate. Please keep the
 following in mind though: 2D (surface) meshes are generated by
-projecting a 2D mesh in the mean plane of the surface. This gives nice
-results only if the surface curvature is small enough. Otherwise you
-_have_ to cut the surface in pieces. For example, using half circles
-to define a cylinder will fail with the unstructured algorithm (you
-should define arcs with angles smaller than Pi, and thus define the
-cylinder with at least three patch surfaces).
+projecting the 2D mesh in a "mean plane" of the surface. This gives
+nice results only if the surface curvature is small enough. Otherwise
+you must cut the surface into several pieces (patches). For example,
+using half circles to define a cylinder will fail with the
+unstructured algorithm: you should define arcs with angles smaller
+than Pi, and thus define the cylinder with at least three patches.
 
 * 5.3 What should I do when the 3D unstructured algorithm fails?
 
@@ -180,16 +180,16 @@ case.
 
 The swapping algorithm is not very clever at the moment. Try to change
 the surface mesh a bit, or recombine your mesh to generate prisms or
-hexahedra.
+hexahedra instead of tetrahedra.
 
 * 5.8 Tools->Visibility does not seem to work with extruded meshes.
 
-This is partially fixed in Gmsh >= 1.54. Since numbers are explicitly
-assigned to mesh entities in the extrude commands (which partially
-destroys the geometry/mesh relationship), the Visibility tool will
-only work as expected when displaying Elementary entities. To
-visualize extruded Physical entities, the only solution is to save the
-mesh, and to read it again.
+This is fixed in Gmsh >= 1.54. However, when region numbers are
+explicitly assigned to mesh entities in the extrude commands (which
+partially destroys the geometry/mesh relationship), the Visibility
+tool will only work as expected when displaying Elementary
+entities. In this particular case, the only solution to visualize
+extruded Physical entities is to save the mesh, and to read it again.
 
 * 5.9 Does Gmsh support curved elements?
 
@@ -221,23 +221,23 @@ Solver.Executable0, etc.), and set the ClientServer option to zero
 
 If you want your solver to interact with Gmsh (for error messages,
 option definitions, post-processing, etc.), you will need to link your
-solver with the 'GmshClient.c' file and add the appropriate function
+solver with the GmshClient routines and add the appropriate function
 calls inside your program. You will of course also need to define your
 solver commands in an option file, but this time you should set the
-ClientServer variable to 1 (e.g. Solver.ClientServer = 1). A complete
-example on how to build a solver that interacts with Gmsh is available
-at http://www.geuz.org/gmsh/doc/mysolver.tgz.
+ClientServer variable to 1 (e.g. Solver.ClientServer = 1). C, C++,
+Perl and Python solver examples are available in the source
+distribution in the utils/solvers directory.
 
 * 6.2 On Windows, Gmsh does not seem to find the solver
 executable. What's wrong?
 
-The solver executable (e.g. 'getdp.exe') has to be in your path. If
-not, simply go to the solver options
-(e.g. Solver->GetDP->Options->Executable) to specify its location.
+The solver executable (for example, 'getdp.exe') has to be in your
+path. If not, simply go to the solver options (for example,
+Solver->GetDP->Options->Executable) to specify its location.
 
 On recent versions of Microsoft Windows (XP SP2), it seems that you
 need to execute the solver (e.g. launch 'getdp.exe') at least once
-independently of Gmsh in order to authorize future executions.
+independently first in order to authorize future executions.
 
 * 6.3 Can I launch Gmsh from my solver (instead of launching my solver
 from Gmsh) in order to monitor a solution?

doc/gmsh.1

-.\" $Id: gmsh.1,v 1.61 2004-12-27 17:51:55 geuzaine Exp $
-.TH Gmsh 1 "26 December 2004" "Gmsh 1.57" "Gmsh Manual Pages"
+.\" $Id: gmsh.1,v 1.62 2005-02-11 02:27:13 geuzaine Exp $
+.TH Gmsh 1 "10 February 2005" "Gmsh 1.59" "Gmsh Manual Pages"
 .UC 4
 .\" ********************************************************************
 .SH NAME
-Gmsh \- an automatic three-dimensional finite element mesh generator
-with built-in pre- and post-processing facilities
+Gmsh \- 3D finite element mesh generator with built-in CAD engine and
+post-processor
 .\" ********************************************************************
 .SH SYNOPSIS
 .B gmsh [file(s)] [option(s)]