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Maybe the next thing is to put a table of known seeds in a new section here
 
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{{stub}}{{Glossary}}
{{About|a constellation that can be triggered to form a target object|the rule B2/S|OCA:Seeds}}
 
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.


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]] [[burn]]ing reaction.
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]] [[burn]]ing reaction.
 
[[One-glider seed]]s, 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 [[Collision|collide]] to construct the target object via a [[glider synthesis]].<ref name="post100181" />
 
'''Seed''' is also sometimes used in a more general way, to mean any initial configuration -- i.e., a [[predecessor]] of the target state of the pattern.
 
==Common one-glider seeds==
{{related|List of one-glider seeds|Collisions of a glider with common objects}}
Many [[common evolutionary sequence]]s have common objects that are one-glider seeds. Here is a list:
* [[Traffic light]] (can be triggered from a [[blinker]], [[beehive]], [[loaf]], [[long boat]], or [[toad]]);
* [[Honey farm]] (can be triggered from a [[block]], beehive, loaf, [[boat]], or toad);
* [[Pi-heptomino|Pi-sequence]] (can be triggered from a block, blinker, beehive, boat, [[ship]], [[pond]], toad, [[beacon]], or [[fishhook]]);
* [[R-pentomino|R-sequence]] (can be triggered from a beehive, loaf, or toad);
* [[B-heptomino|B-sequence]] (can be triggered from a boat, toad, or beacon);
* [[Century|Century sequence]] (can be triggered from a boat, toad, or beacon);
* [[Block and glider|Wing sequence]] (can be triggered from a boat, ship, or beacon);
* [[Lumps of muck]] (can be triggered from a beehive);
* [[Queen bee]] (can be triggered from a ship);
* [[E-heptomino|E-sequence]] (can be triggered from a boat);
* [[Blonk-tie|Blonk-tie sequence]] (can be triggered from a blinker or fishhook)
* [[Phi spark]] (can be triggered from a blinker or a boat)


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" />
{{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-grandchild (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, 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==
* [[Slow salvo]]
* [[Tutorials/Seed building]]
* [[Glider synthesis]]


==References==
==References==
Line 18: Line 47:
|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>


==External links==
==External links==
{{LinkLexicon|lex_s.htm#seed}}
* {{LinkLexicon|lex_s.htm#seed}}
 
__NOTOC__
 
{{Glossary}}

Latest revision as of 19:47, 23 August 2024

This article is about a constellation that can be triggered to form a target object. For the rule B2/S, see OCA:Seeds.

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 collide to construct the target object via a glider synthesis.[1]

Seed is also sometimes used in a more general way, to mean any initial configuration -- i.e., a predecessor of the target state of the pattern.

Common one-glider seeds

See also: List of one-glider seeds, Collisions of a glider with common objects

Many common evolutionary sequences 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-grandchild (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, 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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