IIRC you have to do some integration ... don't ask me how ...

All I can remember, was to start with the function for the path ...

       /x\   /cos(t)*40\
P(t): ( y )=( sin(t)*20 )    // this should look like vectors
       \z/   \    0    /

somehow you have now to integrate now for t
then you have to do something with this ...

when you have finished, you probably can simplify it and it's
possible, that the solution is something with cos(), but it's hard to
tell from here ...

Maybe someone here can help, or tell you where the formulas for this
kind of stuff are ...

--
background{rgb 1}camera{location<1,5,-2>look_at 0}#macro
m(a,b,i)#local d=(b-a)
/8;#local
e=vcross(d,y);#if(i)m(a-e,a+e+2*d,i-1)m(a+e,a+2*d-e,i-1)m(a+3*d-e,a+e
+3*d,i-1)m(a+3*d-e,a+5*d-e,i-1)m(a+6*d-e,a+e+6*d,i-1)m(a+8*d-e,a+e+8*d
,i-1)#else
cylinder{a,b,vlength(d)/3 pigment{rgb 0}}#end#end m(-4*x,2*x,4) // Jan
Walzer

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