Perfect!! Thanks a lot.

No problem for French, I will use a translator to english :)

Did you include in that page also the new trick yo told me in the other post?
@You: "A little trick : when you render such number of matrices
you must enable a button "SV" under Render Menu / Show Sampling Setting / Geometry else image will be truncated!
(Image can also truncated if number of Matricices is too big!"

It's very important I think...