The really nice neck picture in binaries.images shows that my previous
answer wasn't quite what you had in mind.  My formula was for spheres
which are just touching each other, instead of overlapping.

So, I tried the problem again, this time assuming instead that the
distance between the centers was proportional to the radius, and that
the first and last radii were given.  I got the same answer as your
post to binaries.scene-files!

Adam C.


Rune wrote:

> Thanks to both of you for your replies! (there were two who replied right?
> With this OE newsreader I'm never sure if there's some messages hidden to
> me... nevermind...)
>
> After a while I found a solution by myself but I'll have a look at yours
> too, of course, because they might be better and it'll be interesting to see
> them anyway :-)
>
> The solution I found is available in povray.binaries.scene-files

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