Alain, thanks a lot for the "lathe"! I've tryed to use "sor", but I've got a
bad result. Now it looks the same, but it was easier to create. Thank you.
Anyway my problem remains unsolved. However, the variable reflaction and
the understanding of the heart of the problem helps me. It's the real world
view (with the "Cyan" sky) in spite of unrealistic picture.
