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[TableYoung <>]

Hi CGAL team,
                      I have learned CGAL for 3 months, recently l'm
studying the source code of 3D mesh generation ,but there are some questions
i met when i learn CGAL's 3D mesh generation algorithm. Following is my
first question, as we know 3D mesh generation start with
"init_c3t3(c3t3,domain,criteria); " if there was no feateure has been setted
,i also that this function first step is to construct initial points by
using functor 
"domain.construct_initial_points_object()(std::back_inserter(initial_points));"
but i'm very confused that this function not only return intersetion points
on the surface of some random line segments  but also
"index_from_surfacce_patch_index ",i don't know what this surface patch
index is used to do, my second question is what's the surface patch mean? if
the domain is giving by a implicit function .as we know there is no discrete
triangle .i also try to trace the "mesh_polyhedral_implicit_function.cpp"
source code ,as we know ,the domain is close and made by some discrete
triangles.but i found out that the initial points construct function return
the same surface patch index. So i'm more confused.what's the role of 
surface patch index  in 3D mesh generation and what's the surface patch
index mean ? (a subdomain ? a triangles on the domain ? or any thing else..)
      Actually ,i want to use CGAL 3D mesh generation to mesh multiple
domains which are represented by several polyhedrons. but algorithm can't
terminate. so i spent some time to debug the mesh algorithm. 
I sincerely hope to get you help if you know about the algorithm or can you
introduce me some one who know this algorithm a lot.
    Looking forward to your reply.thanks very much.
   
Tobe Yang
           



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