f_helix1(x,y,z,n,p,r,R,s,c,a)
supposedly, the fifth parameter is the period, or "Number of turns per unit
length".

The way I read this is that, for every unit the helix object rises, it should
make one complete turn.  This is obviously not the case.

isosurface {
    function { f_helix1(x, y, z, 1, 1, 0.25, 0.75, 1.5, 1.0, 0.0) }
    max_gradient 4
    threshold 0
    contained_by { box { <-1, 0, -1> <1, 10, 1> } }
    }

this should make 10 complete turns, and it only makes about one and a half.

Regards,
A.D.B.

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