I am unclear why this code results in a pristine cylindrical
extrusion EXCEPT for one small place where it seems to twist
frantically...
include <sweep.scad>
function f(a) = [18*sin(360*a), 18-18*cos(360*a*0.7),
36*sin(360*a/2)];
function shape(d) = let (dd = 5 * (1.2 - d/steps))
[for (i=[1:10:360]) [dd*sin(i), dd*cos(i)]];
step = 0.005;
steps = 1/step;
path = [for (t=[step:step:1-step]) f(t)];
path_transforms = construct_transform_path(path);
sweep(shape(1), path_transforms);

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