You should enter this in the Pattern of the Year contest.
Gemini is a good name and can be used to describe the type of spaceship as well as the specific spaceship.
Due to its large size, Gemini will remain a genre of one for a while...
Now, can we find a replicator that displays "Sierpinski growth", i.e. that of HighLife's replicator?
Oh, that term must have been taken. I meant something else.
calcyman wrote:Due to its large size, Gemini will remain a genre of one for a while...
Not necessarily. Now that Andrew has demonstrated self-replication, we can expect an inundation of related self-replicators.
igblan wrote:The beauty is in the simplicity of the design. Using a single arm producing slow salvos was beginning to look messy and impractically slow. But I was so locked into the "elegance" of such a design that I was blinded to the efficiency of a two-arm approach.
igblan wrote:Nor would I have thought to use a dynamic tape, which leverages the P1 property of stable reflectors and Herschel tracks to allow the timing for glider-pair construction to be microcoded in the timing of the tape gliders.
igblan wrote:Dave Greene and I had also rather locked our thinking into his idea for destroying the original: a number of "bombs" mixed in with the Herschel tracks which, when activated with a single glider, would destroy the pattern without trace - seeds, as it were, of its own destruction. Again, your third-arm cleanup is inspired, and so simple.
knightlife wrote:I am just wondering how long it took to finally complete the spaceship...?
Bringing the ends of the spaceship closer together is also possible to some extent, until the head of the recipe stream starts trying to use the next copy of a reflector array before the tail of the stream has quite finished constructing it...
mscibing wrote:I started construction in mid-December.
I probably won't have time this week to write a full article.
Amazingly, Andrew managed this feat independently, despite the fact that he had access to limited knowledge and resources. In fact, that may have actually helped him -- he was not familiar with, and therefore not constrained by, the preliminary work in this field.
A new age of Game of Life exploration and design!
What is the range of velocities that can be achieved in this way?
For each velocity, what are the smallest spaceships (by various definitions of "smallest")?
How about rakes, guns, puffers, breeders based on such spaceships, and/or constructing them?
How readily can changes in velocity be programmed into such a ship?
Can sets of such ships, with varied velocities, be used to simulate isotropic collisions, etc. to an acceptable degree of accuracy?
...all the required Herschel-related knowledge was contained in the prototype pattern...
... two variants of a 90-desgree reflector which yield an output glider of the same or different colour parity respectively.
Another thing I love about this design is the redundancy in the six 12-gang reflector arrays,
It's not redundancy; it allows the same instructions to serve both ends of Gemini. A stroke of genius, in my opinion!
calcyman wrote:How readily can changes in velocity be programmed into such a ship?
Gemini can only have a constant velocity, and not a variable velocity. It would be possible if the twin constructors had independent instruction tapes, but the same instruction tape is used for both in the original Gemini.
Infinite deceleration requires a totally different design.
calcyman wrote:Infinite deceleration requires a totally different design.
No, it doesn't. Translating the NW end by (6144,2048) and the SE end by (5120,1024) would cause the twins to separate over time, thereby resulting in the spaceship expanding and decelerating.
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