"jr" <cre### [at] gmailcom> wrote:

> uh, maths I don't know and my geometry is, um, shaky?  five centres?

Yeah - I delved into this a while back (2014?) when doing some things with
triangles and bubbles and propellers, ....
Friedrich Lohmueller's analytical geometry tools include file has a bunch of
these.

I made a diagram in VISIO - I'll have to dig that up and post it, if I haven't
already...

> I need to
> do some reading.

Yes.  :D

> anyway, cannot see a 'triangulation.inc', suspect it must be
> one of yours.

http://news.povray.org/povray.general/thread/%3C470e5314%40news.povray.org%3E/

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