Thank You all very much.

I think I will use "caustics",  I tried it a little bit today,
and it seems to work very well.  It should appear to
you as a very basic optional keyword,  but for
myself I didn't use this function before...
... The color_map "fake" seems to be
a very good idea too ! ( probably better if
you want to see rays of light go through the water
volume,  with the scattering function ??! Or does
the particules will interact with the caustics effect
as small objects -surely - and show us
the rays of ligth through the water...
... I will try to take a guess with all that stuff
this week-end .

It is my first use of a forum;  It seems to me  to be
pretty rich and interesting... So,  thanks a lot
for these quick answers !!
                                                                 Alex

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