Alain Martel <kua### [at] videotronca> wrote:

> > (...) It's a reasonable alternative to using a difference
> > which - while not requiring objects with different iors - is very slow to trace.
>
> If you want to use a difference, then, you should use a blob instead of
> 100' to 1000's of spheres.
> That way, you benefit from the blob's hierarchy and internal bounding
> mechanism.

Blobs! I completely forgot about that option. And based on some experiments I
made once, I'd say you're probably right about the their higher rendering speed.

Yeah, I can see the benefit to using blobs to make air/fluid inclusions, and
then maybe applying a facets normal with metric 1 and maybe form <1, 0, 0>. This
way the clouds would refract/reflect light at certain angles only, thus giving a
more crystalline appearance. Hmm...

Sam

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