[Gmsh] Problem with mesh refinement

[orientation f]

Hi,
I download domain.geo from '
http://braque.mema.ucl.ac.be/~jonathan/gmsh_ocean/', and do mesh refinement
under mesh module
correctly. However, when I read my own file (a *.stl file), following the
same step as before, it doesn't do any mesh refinement at all.
Does the input file need to be *.geo file when do mesh refinement?
If I want to use a Threshold field specifies the size of the mesh, and
select an Attractor field to specify geometrical entities,\
how to specify Attractor field's four parameters?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.geuz.org/pipermail/gmsh/attachments/20090505/636a3bb1/attachment.html>