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.
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