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doc/FAQ

-$Id: FAQ,v 1.61 2005-05-13 05:09:08 geuzaine Exp $
+$Id: FAQ,v 1.62 2005-06-04 03:28:31 geuzaine Exp $
 
 This is the Gmsh FAQ
 
@@ -283,6 +283,17 @@ fields. There is also one additional clipping plane available for
 "cutting" only the mesh (by keeping entire elements), in
 'Tools->Options->Mesh->Cut Plane'.
 
+* 5.14 What is the signification of rho, eta and gamma metrics in
+Tools->Statistics?
+
+They measure the quality of the tetrahedra in a mesh:
+
+rho ~ min_edge_length / max_edge_length
+eta ~ volume^(2/3) / sum_edge_length2
+gamma ~ volume / sum_face_area / max_edge_length 
+
+For the exact definitions, look at Mesh/Simplex.cpp.
+
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 Section 6: Solver module