"jr" <cre### [at] gmailcom> wrote:

> yes, I appreciate that.  hence the idea that there should be two distinct
> frontend (prisms and pulleys) macros, utilising the existing more or less as
> they are.

Nope, just need to add one more bit to find a tangent between a point and a
circle.
http://www.ambrsoft.com/TrigoCalc/Circles2/CirclePoint/CirclePointDistance.htm

> wrt moving parts, my guess is that the "trick" will be working with (and from
> the perspective of?) the full length of the rope/cable, since it needs to look
> reasonably realistic when animated.

Seems like Leroy worked most of that out already.

If you could get this to work with that...
http://news.povray.org/povray.binaries.images/thread/%3C3c4d365b%40news.povray.org%3E/

:)  :)  :)

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