"David Fontaine" <lfo### [at] isdnet> wrote:

> I need a shape formed by sweeping an arc around the axis going
through
> it's endpoints, in *standard* POV. With an isosurface, I can use the
> torus equation (sqrt(x^2+z^2)+Major)^2+y^2-Minor^2=0, but when I
expand
> this to a quartic for normal POV it's a full torus instead of just
the
> arc sweep. See my post in p.b.i for the pics of the two different
> methods.

This is a "spindle torus" and you want only the spindle.

Use "intersection" or "clipped_by" with an object that slices of
the rest (i.e. a sphere which has the distance between those arc
endpoints as diameter).

--
Gerald
ger### [at] aonat

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