人に教わったまま、を試して見る [ ] の中に for がある

module octal_star(size, inner) {
     polyhedron(
         points= [
             for (i = [0 : 15])
                 let (theta = i * 360 / 16,
                     unit_vector = [cos(theta), sin(theta), 0])
                 if (i % 2 == 0)
                     size * unit_vector
                 else
                     inner * unit_vector,
             [0, 0, size]    // the apex point
         ],
         faces= [
             for (i = [0 : 15])
                 [i, (i + 1) % 16, 16]
         ]
     );
};

octal_star(20,10);