"Chris B" <nom### [at] nomail com> schreef in bericht
news:4a1e7ec8@news.povray.org...
>> And presumably you're using either catenaries or a
>> full mechanics simulation to produce hanging curves...?
>
> Ahh! Nothing nearly so sophisticated there I'm afraid :-). I have a loose
> segment macro that takes the current point and a new point and adds an
> extra
> point in between roughly in the right place to bring the rope length to
> approximately the value specified as a parameter and to get the lowest
> point
> roughly where it should be for the relative heights of the two end points.
> Then it relies upon using a curved spline for that segment of rope to join
> the dots in a fairly gravity compliant way. There's nothing stopping
> anyone
> with a better grip on the maths adding such a macro though. Each of the
> path-defining macros is quite short, so it doesn't take long to add new
> shape macros.
>
Yum yum... for the ropes and knots.... :-)
For catenaries, there is a set of macros by PM2Ring (2005) which do a better
job than the catenaries by Chris Colefax. There is also a set of macros by
Rob Antonishen (2002) but they do not work quite well I am afraid (last
timeI tried them, earlier this year). Both sets were made available in these
forums at the time.
Thomas
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