[OpenSCAD] hull with for bug

William Adams william_a_adams at msn.com
Sun Sep 4 03:58:59 CEST 2011

I would use this feature if I had it.  Right now I have to bother with creating explicit face lists for things like icosahedron.  If I had Minkowski working on polyhedron, I could just specify the vertices and be done. Of course, the beauty is, once you create the various minkoskyized polyhedra, you can then do CSG with them, so, life just gets easier. I think another interesting direction to do is isosurfaces.  I've simulated blobs in OpenScad, but without being able to turn the point cloud into a mesh, it's kind of limiting.  It would be great if I could generate my point cloud, using the tiny spheres, then do a hull() on that to get a surface, at least the exterior. -- William


- Shaping clay is easier than digging it out of the ground.


 > Date: Sat, 3 Sep 2011 12:20:25 +0100
> From: giles.bathgate at gmail.com
> To: openscad at rocklinux.org
> Subject: Re: [OpenSCAD] hull with for bug
> On 3 September 2011 10:59, nop head <nop.head at gmail.com> wrote:
> > Thanks. It would be nice it this worked because one could then use a for
> > loop to generated arbitrary points, represent them with a very small circles
> > and take the hull to get polygon. That would allow polygons to be created
> > from mathematical functions rather than lists.
> Thats an interesting idea, there is however a limited number of polyhedra one
> can create using convex hulls. If you want to create objects with concave
> features then prehaps we could implement a module that utilising the following
> cgal functionality:
> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Surface_reconstruction_points_3/Chapter_main.html
> Personally I think the best solution would be to allow a manipulation
> of vector lists using mathematical functions, and then feed the lists
> to the polyhedron module. However this would require variables that
> vary and dynamic arrays. So the python based solutions can probably do
> this well, as well as RapCAD of course ;)
> Regards
> Giles
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