Wasn't it Stefan Viljoen who wrote:
>Joanne Simpson spake:
>
>> found these lovely bubbles on the way to something completely different
>
>Rendering time? I'm busy with something similar, and it as been running
>1000+ hours...

Have you read my bubbles tutorial?

There's a trick that can increase the rendering speed of bubbles by a
factor of about 60 if your slow method involves taking the difference of
a large number of bubble objects from inside a transparent container.

http://www.econym.demon.co.uk/holetut/holes3.htm

-- 
Mike Williams
Gentleman of Leisure

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