In general, we can decompose the outer boundary polygon in convex sets, like is done by minkowski, and union the convex hull of each part. Em 27 de ago de 2017 07:39, <arnholm@arnholm.org> escreveu: On 2017-08-26 22:21, David Eccles (gringer) wrote: > hull() will do this for shapes with a convex external face / edge. > Yes, but it will fail for the case of a concave 2D shape, e.g. the "A"-shape as mentioned in the first post. Hull only considers the vertex coordinates, not the topology of the shape. Carsten Arnholm _______________________________________________ OpenSCAD mailing list Discuss@lists.openscad.org http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

On 2017-08-27 11:46, Ronaldo Persiano wrote: > In general, we can decompose the outer boundary polygon in convex > sets, like is done by minkowski, and union the convex hull of each > part. You can do that, and thus re-create the input :-) Carsten Arnholm