> I'll post again when I have more research behind me and either a solution > or concrete frustration in sight -- not before. > > Kirby
OK, I've got a solution working. Here's an interim result: http://www.4dsolutions.net/satacad/pythonicmath/connectorstudy2.jpg Notice how the zigzag metal bands connect jade icosahedra and don't clutter the unit cell otherwise, i.e. no extra tabs that don't go through bridge points. I ended up using a feature specific to my vector class: the bridge points all had 4-tuple signatures with floats = multiples of 1/2. So I used a little round and chop function that appears to have worked: @staticmethod def _mktuple(qray): thecoords = qray.coords thelist = [] for c in thecoords: t = float(str(round(c,5))[:4]) thelist.append(t) return tuple(thelist) The 4-tuples are all positive, even in xyz octants w/ negatives, thanks to quadray vector algebra. I stuffed 'em into a dict like this: def add2pairs(adict, thekeys): for newkey in thekeys: adict[newkey] = adict.get(newkey,0) + 1 return addict ...then permitted only those with value = 2 to render. Special thanks to Guido and Scott for helping me grabble with this issue. Kirby Note: Here's the stuff photographed in time/size (vs. rendered): http://www.4dsolutions.net/satacad/pythonicmath/lanahan_artifact.jpg (photo by Dave Ulmer @ Linus Pauling House, wwwanderers.org) _______________________________________________ Edu-sig mailing list [email protected] http://mail.python.org/mailman/listinfo/edu-sig
