Re: Try on Degrowth algori

On 11/28/06, Sven Heinz <[email protected]> wrote:
> <with floating point numbers there's no such thing as "the same point",
> < so the ProximityKnotter searches for joints closer than half a normal
> < interval from each other.
>
> < an octahedron has 12 intervals, two tetrahedrons together have 9, so
> < something has to happen to three of them, and all connected things
> < must make sense too.  life would be easier if there were nothing but
> < tetrahedrons.
>
> Huh,what the hell are you talking about? the ProximityKnotter is thought to merge overlapping parts if points sufficiently overlapp right? What I was talking about was the degroth mechanism for octaeders, like with tetraders were one line can be removed and the endpoints are merged the same can be done with a octaeder.

ahh.. so you mean take one interval away from an octahedron, and bring
the interval's two joints together into one.  very good!

> Regarding the proximity knoter, does it only look at one point?

the proximity knotter is a "joint visitor" object which does a large
number (N*N) of distance calculations (although i avoid square root,
and use "quadrance" instead).  it must calculate the distances from
every joint to every other joint.  it's not really so slow, unless N
gets large.

> I would introduce a condition only to merge if there are three points directly connected(a face) that fulfill all the distance condition.

connecting faces might be nice, but you have to imagine all the things
that can and will go wrong.  it's very nice to avoid structures that
overlap.  i still find the idea of merging entire tetrahedrons to be
quite charming.

but actually what i would love to accomplish more than anything else
is to drop all of these tetrahedrons and octahedrons and be able to do
everything in terms of tensegrities.  i believe that tensegrity
deserves a great deal more attention than it has gotten and that much
can be learned from it that has not yet been thought about.  do you
agree?  my problem is to come up with tensegrity growth mutations, so
if you're interested in thinking about that, it would be exciting.

-- 
Gerald de Jong
[email protected]
http://www.darwinathome.org

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