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{{stub}}{{Glossary}}
A [[seed]] is a [[constellation]] that when triggered (normally hit by a [[glider]]) evolves into a target object, possibly with some extra junk.
A [[seed]] is a [[constellation]] that when triggered (normally hit by a [[glider]]) evolves into a target object, possibly with some extra junk.


Line 5: Line 4:


One-glider seeds, or "1G seeds", are particularly useful in [[slow salvo]] construction because the constellation can be built up incrementally, with changes made one glider at a time.  When it is complete it can be [[trigger]]ed by the final glider in the recipe.  Triggering a seed will usually create several precisely synchronized gliders that then co-operate to construct the target object, similar to a standard [[glider synthesis]].<ref name="post100181" />
One-glider seeds, or "1G seeds", are particularly useful in [[slow salvo]] construction because the constellation can be built up incrementally, with changes made one glider at a time.  When it is complete it can be [[trigger]]ed by the final glider in the recipe.  Triggering a seed will usually create several precisely synchronized gliders that then co-operate to construct the target object, similar to a standard [[glider synthesis]].<ref name="post100181" />
==Common one-glider seeds==
Many common active regions have common objects that are one-glider seeds. Here is a list:
* [[Traffic light]]:
** Blinker
** Beehive
** Loaf
* [[Honey farm]]:
** Block
** Beehive
** Loaf
** Boat
* [[Pi heptomino|Pi-seqeunce]]:
** Block
** Blinker
** Beehive
** Boat
** Ship
** Pond
* [[R-pentomino|R-sequence]]
** Beehive
** Loaf
* [[B heptomino|B-sequence]]
** Boat
* [[Century|Century sequence]]
** Boat
* [[Block and glider|Wing sequence]]
** Boat
** Ship
* [[Blockade]]
** Beehive
* [[Queen bee]]
** Ship
* [[Phi spark]]
** Blinker
** Boat
{{EmbedViewer
|pname = Stilllifepiseeds
|position = right
|viewerconfig = #C [[ AUTOSTART GPS 5 LOOP 17 T 0 PAUSE 0.6 T 4 PAUSE 0.4 T 6 PAUSE 0.7 T 12 PAUSE 0.2 ]]
}}
The reason that so many objects are one-glider seeds for a pi-sequence is because when a glider hits a line of two cells in a still life in a certain way, the way that the glider reacts almost always produces a pentaplet grandparent of the pi-heptomino after four generations, as well as some cells behind it.<ref name="p105552" /> For a block, beehive, boat (in one orientation), ship (in one orientation), and pond, the excess cells turn out to be sparks, so a clean pi-sequence is produced. The only common one-glider seed for a pi-sequence that does not produce the pi-this way is a blinker, which does not actually produce a pi-heptomino but instead produces a twelve-cell cluster with the same great-grandparent (hence the term pi-''sequence'' rather than pi-''heptomino'').
==Splitter-based==
Many spaceships and some other difficult-to-construct objects have activation stages that require many gliders coming at once from multiple directions. For uses in self-constructing circuitry, simply firing all of the gliders at once in a synchronized manner is impractical. For this reason, for the activation stage, the activation stage uses a series of [[turner|turners and splitters]] that create all of the necessary synchronized gliders from only one initial glider that requires no synchronization.


==See also==
==See also==
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|author = Goldtiger997
|author = Goldtiger997
|date  = July 7, 2020
|date  = July 7, 2020
}}</ref>
<ref name="p105552">{{LinkForumThread
|format = ref
|title  = One Glider Seeds
|p      = 105552
|author = Entity Valkyrie 2
|date  = October 4, 2020
}}</ref>
}}</ref>
</references>
</references>

Revision as of 17:25, 11 December 2020

A seed is a constellation that when triggered (normally hit by a glider) evolves into a target object, possibly with some extra junk.

Seed constellations are commonly used in self-constructing circuitry. For example, to create a faraway target object to start construction of a new copy of a construction arm at a safe distance, it is often useful to use a seed for a complex spaceship or wickstretcher -- something that can be stopped when it reaches its destination by following it with a faster spaceship or wick burning reaction.

One-glider seeds, or "1G seeds", are particularly useful in slow salvo construction because the constellation can be built up incrementally, with changes made one glider at a time. When it is complete it can be triggered by the final glider in the recipe. Triggering a seed will usually create several precisely synchronized gliders that then co-operate to construct the target object, similar to a standard glider synthesis.[1]

Common one-glider seeds

Many common active regions have common objects that are one-glider seeds. Here is a list:

x = 44, y = 8, rule = B3/S23 obo7bobo7bobo7bobo7bobo$b2o8b2o8b2o8b2o8b2o$bo9bo9bo9bo9bo2$b2o8b2o8b2o8b2o8b2o$b2o7bo2bo6bobo7bobo7bo2bo$11b2o8bo8b2o8bo2bo$41b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 5 LOOP 17 T 0 PAUSE 0.6 T 4 PAUSE 0.4 T 6 PAUSE 0.7 T 12 PAUSE 0.2 ]]
(click above to open LifeViewer)
RLE: here Plaintext: here

The reason that so many objects are one-glider seeds for a pi-sequence is because when a glider hits a line of two cells in a still life in a certain way, the way that the glider reacts almost always produces a pentaplet grandparent of the pi-heptomino after four generations, as well as some cells behind it.[2] For a block, beehive, boat (in one orientation), ship (in one orientation), and pond, the excess cells turn out to be sparks, so a clean pi-sequence is produced. The only common one-glider seed for a pi-sequence that does not produce the pi-this way is a blinker, which does not actually produce a pi-heptomino but instead produces a twelve-cell cluster with the same great-grandparent (hence the term pi-sequence rather than pi-heptomino).

Splitter-based

Many spaceships and some other difficult-to-construct objects have activation stages that require many gliders coming at once from multiple directions. For uses in self-constructing circuitry, simply firing all of the gliders at once in a synchronized manner is impractical. For this reason, for the activation stage, the activation stage uses a series of turners and splitters that create all of the necessary synchronized gliders from only one initial glider that requires no synchronization.

See also

References

  1. ↑ Goldtiger997 (July 7, 2020). One Glider Seeds (discussion thread) at the ConwayLife.com forums
  2. ↑ Entity Valkyrie 2 (October 4, 2020). One Glider Seeds (discussion thread) at the ConwayLife.com forums
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