JRG wrote:
> 
> You meant something like this?
> 
> [...]
> 

Yes, that's very good.  

It indeed looks like a bug to me, there is an easy workaround, just add
another object to the scene like:

plane {y,-100 }

I'm of course in doubt if this also works in your complete scene but in
this small sample it generally seems to work.

Another method to fix it for your scene would be to use Chris Colefax's
spline include file and not the sphere_sweep.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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