IF you are after spherical covering grids or realisation browse this
page of Contents and
look first in
those pages of tutorials and second in the Friend's pages : miscellany
here
Grids= Norbert TRUPIANO (nono) Claude HOCHET ; John
RICHING ; Jan VOS The steady flow of
new tuts or new
personal effort is not documented in Contents : explore the pages and
every month have a look a What is New page