"Bald Eagle" <cre### [at] netscapenet> wrote:

> Yeah - I delved into this a while back (2014?) when doing some things with
> triangles and bubbles and propellers, ....

See:
http://news.povray.org/povray.binaries.images/thread/%3Cweb.53e25769ad990c965e7df57c0%40news.povray.org%3E/?ttop=429330
&toff=800

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