Fixed hull_points() for 2D

geometry.scad

@@ -291,8 +291,7 @@ function simplify_path_indexed(points, path, eps=EPSILON, _a=0, _b=2, _acc=[]) =
 //   point_in_polygon(point, path)
 // Description:
 //   This function tests whether the given point is inside, outside or on the boundary of
-//   the specified polygon using the Winding Number method:
-//   - (http://geomalgorithms.com/a03-_inclusion.html)
+//   the specified polygon using the Winding Number method.
 //   The polygon is given as a list of points, not including the repeated end point.
 //   Returns -1 if the point is outside the polyon.
 //   Returns 0 if the point is on the boundary.

hull.scad

@@ -62,7 +62,7 @@ module hull_points(points, fast=false) {
 			}
 		} else {
 			perim = hull(points);
-			if (len(perim[0]) == 2) {
+			if (is_num(perim[0])) {
 				polygon(points=points, paths=[perim]);
 			} else {
 				polyhedron(points=points, faces=perim);