"DD123" <286### [at] qqcom> wrote:
> Hello everyone,
> Can someone teach me how to create spirals
> exactly like figure 1?
>

Here is a slightly re-worked version of your code (and uses many more spline
points to get smoother curves.) Note the '150' in three places.

sphere_sweep {
linear_spline 150,
#declare N = 0;
#while(N < 150)
#declare RAD = N*9*pi/150; // 9*pi produces 4 1/2 'coils'
<2*cos(RAD), .028*N, 2*sin(RAD)>, .1
#declare N = N + 1;
#end
pigment {color Yellow}
}

Have fun!

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