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Advanced users
Is there a reasonably easy way to outline an irregular and curved 2D shape
with hollow cylinders?
Thanx
tgl
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"tgl" <aub### [at] sympatico ca> wrote in message
news:web.46c669e8a3c5c29266be0b530@news.povray.org...
> Advanced users
> Is there a reasonably easy way to outline an irregular and curved 2D shape
> with hollow cylinders?
> Thanx
> tgl
>
Hi Aubrey,
I think that the difficultly very much depends on how you want to define the
irregular, curved 2D shape that you start from.
If you've got a succession of points on the curve you can make a spline, or
if your starting point is a spline, then you should be able to use
Spline_Trans to translate a succession of objects to points on the spline.
This could get a bit fiddly if you want to avoid gaps and overlaps.
If you start with any form of 'extruded' object based on your irregular 2D
shape then you could use successive calls to the Trace function to identify
a set of positions around the perimeter. This could be the easiest way if
your starting point is a vector graphic defined in InkScape which can export
POV-Ray prism objects. If the 2D shape is roughly circular you could start
each trace at the centre and sweep around in a circle with each successive
trace, identifying points where your cylinders will be placed. The tricky
bit here is avoiding 'blind' spots, where part of the perimeter is masked by
another part of the perimeter (and still fiddly if you want to avoid gaps
and overlaps).
Regards,
Chris B.
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Wasn't it tgl who wrote:
> Advanced users
>Is there a reasonably easy way to outline an irregular and curved 2D shape
>with hollow cylinders?
You might consider the difference of two spheresweep objects that follow
the same path but have a different radius.
--
Mike Williams
Gentleman of Leisure
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Mike Williams <nos### [at] econymdemoncouk> wrote:
> Wasn't it tgl who wrote:
> > Advanced users
> >Is there a reasonably easy way to outline an irregular and curved 2D shape
> >with hollow cylinders?
>
> You might consider the difference of two spheresweep objects that follow
> the same path but have a different radius.
>
> --
> Mike Williams
> Gentleman of Leisure
What about using a hollow sphere_sweep with differenced clear ends?
difference{
sphere_sweep{
//any sweep from A to B, 0.9 thick
}
sphere{A,1 pigment{Clear}}
sphere{B,1 pigment{Clear}}
}
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