Here's the source, image below, maybe someone with more computing power (and
inspiration)
can do a little more with it---------
Quadhall

#version unofficial MegaPOV 0.5;
light_source { <3,3,-8> 1 shadowless}
camera { location <0,3,-4> look_at <0,0,0> }
#declare major=1.5;
#declare minor=.2;
#declare a=function{abs(sqrt((x^2)+(z^2))-major)}
#declare b=function{sqrt(y^2+a^2)-minor+1}
#declare c=function{sqrt((x*x)+(y*y))}
#declare d=function{c(x,y,z)*3*pi}
#declare e=function{x*cos(d)+y*sin(d)}
#declare f=function{-1*x*sin(d)+y*cos(d)}
isosurface
{
 function {b(e,f,z)}
 contained_by{sphere {0,3}}
 //eval
 max_gradient 11
 threshold 1
 pigment{color rgb 1}
 rotate<0,-15,0>
 finish{ambient .4}
}

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