Le 14-05-10 13:49, David Given a écrit :
> I need a picture of an ocean of clouds, seen from above (as from an
> aeroplane). It needs to be completely opaque, so no gaps, which means
> that a lot of the existing cumulus-style cloud macros aren't really
> suitable.
>
> Before I started fiddling with isosurfaces and density functions, does
> anyone already have one of these?
>

To make clouds, you need to use scattering media.
If it needs to be opaque, a high enough density and thickness will do 
the trick.
As the light will come from above, the brightness will effectively drown 
out any thing below those media clousd, even if they are actualy not 
thick/dense enough to be opaque. Keep in mind that they will case shadow 
on whatever is under them. This will help making them look more opaque 
than they realy are.	/
You can also use stacked surfaces with some partialy transparent pigment.

If they are to be seen from very high above, a simple plane or sphere 
with an adequate pigment may be good enough. The pigment can go from 
totaly transparent to totaly opaque.



Alain

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