Glad to hear it, Emanuele! I'm glad someone else is getting use out of my geodesic calculations in OpenSCAD. I was surprised not to find another implementation, and writing it was a bit of a pain, so I'm happy to save others the pain of that recursion hell :) Let me know if there's anything specific you'd like it to do, and I can try and point you in the right direction or make the changes myself, if they're simple. Best, Yona > Emanuele Spatola <mailto:emanuele.spatola@gmail.com> > June 5, 2015 at 18:04 > Thanks Yona, the "nice_rendering.scad" works perfectly! > The truncated icosahedron has a limited number of faces, I need > something more flexible like the "Goldberg Polyhedra". > I think the code would not change much as in the currently generated > polyhedron the pentagon and hexagon are already there, we just need to > remove some edges.. (said like that it is seems easy :) > I'm already printing it: > https://www.dropbox.com/s/fkh63u84h6vll9g/Screen%20Shot%202015-06-06%20at%2001.49.09.png?dl=0 > but in the meantime I'll try to look into your code to see if I can > make it like I need. > I'm working on a rolling ball robot and I still have a lot of other > pieces to design. > > Thanks a lot!! > > Emanuele > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > Yona Appletree <mailto:hypher@gmail.com> > June 5, 2015 at 13:48 > Emanuele, > > There's a really fantastic polyhedron set for OpenSCAD available here: > http://kitwallace.co.uk/3d/solid-index.xq > > They render like this: > https://www.dropbox.com/s/881dv9jy8l9e2pg/Screenshot%202015-06-05%2013.39.22.png?dl=0 > I updated that gist to include an example of how to this -- just run > git pull to grab the new nice_rendering.scad file. > > The logic used to generate those is pretty complex, but it's fairly > easy to swap in a new polyhedron. The result looks like this: > https://www.dropbox.com/s/xi0dxp9wjlammj7/Screenshot%202015-06-05%2013.44.12.png?dl=0 > > If you want just pentagons and hexagons, you can just use the > truncated icosahedron provided here: > http://kitwallace.co.uk/3d/solid-to-scad.xq?id=TruncatedIcosahedron&scad=shell > Which looks like this: > https://www.dropbox.com/s/ooa88h6y0v4meao/Screenshot%202015-06-05%2013.47.18.png?dl=0 > > Cheers, > > Yona > > Emanuele Spatola <mailto:emanuele.spatola@gmail.com> > June 5, 2015 at 12:15 > Yona, your design is great!! Thank for sharing it. > I was trying to understand the code, but I have to say I'm quite lost :( > I'd need it to look like this: http://www.thingiverse.com/thing:79337 > My idea is for each triangular face, create a pyramid with base the > triangle itself (a bit smaller) and as top the center of the polyhedron. > then subtract all this pyramid from the main polyhedron. > The problem is I have no idea where to start, any suggestion? :) > > Thanks, > Emanuele > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > Yona Appletree <mailto:hypher@gmail.com> > June 5, 2015 at 00:40 > Emanuele, > > Here's another thing that has the hexagons and pentagons calculated: > http://www.thingiverse.com/thing:334955 > > That thing (and most of the others I've seen) "cheat" in the sense > that they don't actually do face sub-division, which is a bit tricky > to implement in the OpenSCAD language. > > I've created a gist, > https://gist.github.com/Yona-Appletree/a03bc32a5c5ca6886e38 with my > implementation of geodesic slicing. The geodesic_example.scad file > contains an example of using the library. You'll have to excuse the > quality of the code... I was just learning OpenSCAD and geodesic math > at the time, so it's kind of funky, but it does work correctly, as far > as I know. > > Best, > > Yona > > Emanuele Spatola <mailto:emanuele.spatola@gmail.com> > June 4, 2015 at 17:56 > After almost a day of failed attempts and research, I found out what I > wanted to create is not physically possible :) > or at least it's not possible just with hexagons, you need to put some > pentagons in the middle. > The name of the polyhedron is Geodesic Sphere dual: > http://en.wikipedia.org/wiki/Geodesic_dome#Chord_factors > > the design is not as straightforward as I thought, I found a couple of > .scad sources: > http://www.thingiverse.com/thing:345775 > http://www.thingiverse.com/thing:65820 > but they are not parametric. > > Also turned out openJsC > <http://openjscad.org/#examples/sphere.jscad>AD has a geodesic sphere > built in: > https://plus.google.com/+ReneKMueller/posts/5hp2CcMRJqu > > So now I'm playing with the geodesic sphere source code trying to make > what I need: > http://openjscad.org/#examples/geodesic-sphere.jscad > > Thanks to everybody who helped!! > > Emanuele > > > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org