Wasn't it Gail Shaw who wrote:
>I'm trying to make a coil of rope by revolving the 3.5 function
>f_helix1 around an axis  and I just can't seem to it right
>
>Has anyone done this before?
>

Is this anything like what you ware attempting?

#declare F_Helix=
 function{f_helix1(x,y,z, 2, 20, 0.06, 0.04, 1, 1, 0)}

isosurface {
 function {F_Helix(f_r(x,y,z)-1, f_ph(x,y,z), z)}
 max_gradient 10
 contained_by {box {-1.5,1.5}}
 pigment {rgb 1}
 rotate y*45
}





-- 
Mike Williams
Gentleman of Leisure

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