added some debug code

Mesh/meshGRegion.cpp

-// $Id: meshGRegion.cpp,v 1.25 2007-01-18 10:18:30 geuzaine Exp $
+// $Id: meshGRegion.cpp,v 1.26 2007-01-25 20:41:40 geuzaine Exp $
 //
 // Copyright (C) 1997-2007 C. Geuzaine, J.-F. Remacle
 //
@@ -457,8 +457,7 @@ void meshNormalsPointOutOfTheRegion(GRegion *gr)
 	}
 	++it_b;
       }
-      Msg (INFO,"Region %d Face %d, %d intersect",
-	   gr->tag(), gf->tag(), nb_intersect);
+      Msg(INFO,"Region %d Face %d, %d intersect", gr->tag(), gf->tag(), nb_intersect);
       if(nb_intersect >= 0) break; // negative value means intersection is not "robust"
     }
     
@@ -475,6 +474,14 @@ void meshNormalsPointOutOfTheRegion(GRegion *gr)
       ++it;
     }
   }
+
+  // FILE *fp = fopen("debug.pos", "w");
+  // fprintf(fp, "View \"debug\" {\n");
+  // for(std::list<GFace*>::iterator it = faces.begin(); it != faces.end(); it++)
+  //   for(unsigned int i = 0; i < (*it)->triangles.size(); i++)
+  //     (*it)->triangles[i]->writePOS(fp, 1., (*it)->tag());
+  // fprintf(fp, "};\n");
+  // fclose(fp);
 }
 
 void meshGRegion::operator() (GRegion *gr) 

doc/FAQ

-$Id: FAQ,v 1.79 2007-01-25 15:51:04 geuzaine Exp $
+$Id: FAQ,v 1.80 2007-01-25 20:41:40 geuzaine Exp $
 
 This is the Gmsh FAQ
 
@@ -164,42 +164,40 @@ Section 5: Mesh module
 
 * 5.1 What should I do when the 2D unstructured algorithm fails?
 
-Send us a bug report (including your geometry).
+Verify that the 1D mesh does not self-intersect. If it does, use a
+smaller characteristic length. If it doesn't, send us a bug report
+(including your geometry).
 
 * 5.2 What should I do when the 3D unstructured algorithm fails?
 
-Try to change some characteristic lengths in your input file to
-generate meshes that better suit the geometrical details of your
-structure.
+Try the other 3D algorithms (Tool->Options->Mesh->General->3D
+algorithm). If none works, try to adapt the characteristic lengths in
+your input file so that the surface mesh better matches the
+geometrical details of the model. If nothing works, send us a bug
+report (including your geometry).
 
-* 5.3 I changed the characteristic lengths, but the 3D algorithm still
-does not work. What should I do?
-
-Try one of the other algorithms (Tool->Options->Mesh->General->3D
-algorithm). If everything fails, buy a professional mesh generator ;-)
-
-* 5.4 The quality of the elements generated by the 3D algorithm is
+* 5.3 The quality of the elements generated by the 3D algorithm is
 very bad.
 
 Use 'Optimize quality' in the mesh menu. 
 
-* 5.5 Non-recombined 3D extruded meshes sometimes fail.
+* 5.4 Non-recombined 3D extruded meshes sometimes fail.
 
 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 instead of tetrahedra.
 
-* 5.6 Can I explicitly assign region numbers to extruded layers?
+* 5.5 Can I explicitly assign region numbers to extruded layers?
 
 No, this feature has been removed in Gmsh 2.0. You must use the
 standard entity number instead.
 
-* 5.7 Did you remove the elliptic mesh generator in Gmsh 2.0?
+* 5.6 Did you remove the elliptic mesh generator in Gmsh 2.0?
 
 Yes. You can achieve the same result by using the transfinite
 algorithm with smoothing (e.g., with "Mesh.Smoothing = 10").
 
-* 5.8 Does Gmsh support curved elements?
+* 5.7 Does Gmsh support curved elements?
 
 Yes, Gmsh can generate both 1st order and 2nd order elements. To
 generate second order elements, click on 'Second order' in the mesh
@@ -207,14 +205,14 @@ menu after the mesh is completed. To always generate 2nd order
 elements, select 'Generate second order elements' in the mesh option
 panel. From the command line, you can also use '-order 2'.
 
-* 5.9 Can I import an existing surface mesh in Gmsh and use it to
+* 5.8 Can I import an existing surface mesh in Gmsh and use it to
 build a 3D mesh?
 
 Yes, you can import a surface mesh in any one of the supported mesh
 file formats, define a volume, and mesh it. For an example see
 'demos/sphere-discrete.geo'.
 
-* 5.10 How do I define boundary conditions or material properties in
+* 5.9 How do I define boundary conditions or material properties in
 Gmsh?
 
 By design, Gmsh does not try to incorporate every possible definition
@@ -227,12 +225,12 @@ Lines, Physical Surfaces and Physical Volumes). See the reference
 manual as well as the tutorials (in particular 'tutorial/t1.geo') for
 a detailed description and some examples.
 
-* 5.11 How can I display only the mesh associated with selected
+* 5.10 How can I display only the mesh associated with selected
 geometrical entities?
 
 See question 4.3.
 
-* 5.12 How can I "explore" a mesh (for example, to see inside a
+* 5.11 How can I "explore" a mesh (for example, to see inside a
 complex structure)?
 
 You can use 'Tools->Clipping Planes' to clip the region of
@@ -246,7 +244,7 @@ fields. There is also one additional clipping plane available for
 "cutting" only the mesh (by keeping entire elements), in
 'Tools->Options->Mesh->Cut Plane'.
 
-* 5.13 What is the signification of Rho, Eta and Gamma in 
+* 5.12 What is the signification of Rho, Eta and Gamma in 
 Tools->Statistics?
 
 They measure the quality of the tetrahedra in a mesh:
@@ -436,7 +434,7 @@ line option.
 
 * 7.14 How can I see "inside" a complicated post-processing view?
 
-See question 5.12. 
+See question 5.11. 
 
 When viewing 3D scalar fields, you can also modify the colormap
 ('Tools->Options->View->Map') to make the iso-surfaces "transparent":