Create a convex polyhedron by hulling a list of points.
points
use <polyhedron_hull.scad>; polyhedron_hull([ [1, 1, 1], [1, 1, 0], [-1, 1, 0], [-1, -1, 0], [1, -1, 0], [0, 0, 1], [0, 0, -1] ]);