Soace Munky nous apporta ses lumieres ainsi en ce 2004-10-15 20:36... :

> Soace Munky wrote:
>
>> isosurface
>> {
>>     function
>>     {f_sphere(x, y, z, 1.2)-f_noise3d(x, y, z)}
>> }
>> all i get is a box! whats going on!?!?!!!1adslkfj
>> I can't figure this out, what am I missing? help!
>
> so sorry for the stupid question...i missed the part where default is 
> defined. i picked this up only a few days ago, imfairly new to this.
> i figured it out...
> im screwing around with media, trying to put bubbles of fog in muddy 
> water, and i needed a shape for a more-or-less bubble of air.

Relatively small bubles under the water surface are spherics. Those on 
the surface have the bottom side flatened, doable with a merge of a half 
sphere, a torus and a short sylinder.
Try this:
Have your water have the hollow attribute with an ior of 1.33. Use an 
union to place your underwater bubbles using an ior or 1, if using 
dispersion, use a value around 0.9.

Alain

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