Mike Horvath <mik### [at] gmailcom> wrote:
> On 8/13/2018 10:41 PM, Mike Horvath wrote:
> > Is there a list somewhere of parametric surfaces that take three
> > parameters?

> Er, I mean solids, not surfaces.


I toyed with this a while back:
http://news.povray.org/povray.advanced-users/thread/%3Cweb.579fc21ee9f788f45e7df57c0@news.povray.org%3E/

Any parametric surface would become a parametric solid, given a variable third
parameter, since - using the sphere for example, you'd have the r value of the
radius.
Varying the radius from 0 to unity would give you a solid sphere.

But "solids" in POV-Ray are really only surfaces with insides and outsides,
aren't they...?

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