oblique wrote:Hmm. Choosing initial targets is easy. Just put them in a file together (my program should be able to load rle, gencol results and the traditional ***.*** notation without problems - just leave empty lines between to rle or ***.*** patterns).

Sorry, I didn't really finish the thought. One important detail is that List 1 and List 2 objects can only be built in certain specific columns close to the block trails. You can build any of them anywhere you want, as long as it's sufficiently far away -- but for some objects you might have to go out a fair distance from the trails to get a free choice of location.

The idea is to run some rephasers, then a backrake, then some other number of rephasers, and then a forerake, to hit exactly the right lanes. You might need several rephasers between the rakes, so at a guess, you might not have absolutely free choice of List 1 or List 2 until around 1000-1500 cells from the trails.

So... is it worth worrying about including (x,y) locations as part of these List 1 / List 2 targets?

oblique wrote:I didn't quite get which orientations of - say - the pi mess should be included ...

The messy explosions were included in the lists only to make the collision sequences easier to recognize -- it probably won't be useful to build them very often. I suppose some of the pi explosions might come in handy to absorb extra gliders, up toward the top of the spaceship, but you're very likely to end up with period-doubling effects that are too annoying to be worth the trouble.

Gliders on the same color squares will build List 1, and gliders on different color squares will produce List 2. But I'm not sure that's easy for everyone to translate into useful information... Basically you're in List 1 if you can adjust the timing and crash two gliders together and get a pi explosion (or a pond, eater, interchange, or anything that's just beehives, like a honeyfarm). If you see traffic lights or single blinkers, glider kickbacks, or B-heptominos, you're in List 2. Blocks are less conclusive, but you can generally tell where you are by testing a few glider collisions with adjacent timings.

Here are all the workable orientations for left-side construction, in order, with List 1 in the top row:

`x = 964, y = 84, rule = B3/S23`

7bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24b

o24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo

24bo24bo24bo24bo$6bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo

24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo

24bo24bo24bo24bo24bo24bo24bo24bo24bo$6b3o22b3o22b3o22b3o22b3o22b3o22b

3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b

3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b

3o22b3o22b3o22b3o22b3o2$5bo74bo24bo49bo649bo49bo24bo74bo$o75bo$2b2o23b

2o24bo47bo50bo$b2o24bobo22b2o23b3o23b2o23b2o24bo$3bo23bo24bobo22bo24b

2o24bobo22b2o23b3o23b2o23b2o24bo$78bo25bo23bo24bobo22bo24b2o24bobo22b

2o23b3o23b2o23b2o24bo$179bo25bo23bo24bobo22bo24b2o24bobo22b2o23b3o23b

2o23b2o24bo$280bo25bo23bo24bobo22bo24b2o24bobo22b2o23b3o23b2o23b2o24bo

$381bo25bo23bo24bobo22bo24b2o24bobo22b2o23b3o23b2o23b2o24bo$482bo25bo

23bo24bobo22bo24b2o24bobo22b2o23b3o23b2o23b2o24bo47bo50bo24bo$583bo25b

o23bo24bobo22bo24b2o24bobo22b2o23b3o23b2o23b2o24bo98bo$684bo25bo23bo

24bobo22bo24b2o24bobo22b2o23b3o23b2o23b2o24bo$785bo25bo23bo24bobo22bo

24b2o24bobo22b2o$886bo25bo23bo24bobo36$38b2o24b2o510b2o$38b2o24b2o510b

2o6$7bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24b

o24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo

24bo24bo24bo24bo24bo$6bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo

24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo

24bo24bo24bo24bo24bo24bo24bo24bo24bo24bo$6b3o22b3o22b3o22b3o22b3o22b3o

22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o

22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o22b3o

22b3o22b3o22b3o22b3o22b3o2$o4bo449bo49bo449bo$2b2o23b2o24bo$b2o24bobo

22b2o23b3o23b2o23b2o24bo$3bo23bo24bobo22bo24b2o24bobo22b2o23b3o23b2o

23b2o24bo$78bo25bo23bo24bobo22bo24b2o24bobo22b2o23b3o23b2o23b2o24bo98b

o$179bo25bo23bo24bobo22bo24b2o24bobo22b2o23b3o23b2o23b2o24bo47bo$280bo

25bo23bo24bobo22bo24b2o24bobo22b2o23b3o23b2o23b2o24bo$381bo25bo23bo24b

obo22bo24b2o24bobo22b2o23b3o23b2o23b2o24bo$482bo25bo23bo24bobo22bo24b

2o24bobo22b2o23b3o23b2o23b2o24bo$583bo25bo23bo24bobo22bo24b2o24bobo22b

2o23b3o23b2o23b2o24bo98bo$684bo25bo23bo24bobo22bo24b2o24bobo22b2o23b3o

23b2o23b2o24bo$785bo25bo23bo24bobo22bo24b2o24bobo22b2o$886bo25bo23bo

24bobo5$374b2o$374b2o542b2o$918b2o!

#C or if you prefer LifeHistory with labels...

x = 971, y = 100, rule = LifeHistory

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20.D4.D42.D3.D.3D.2D2.2D634.D3.D.3D.2D2.2D38.D4.D20.D4.D65.D3.D.D.2D

2.2D6$10.A24.C24.C24.A24.A24.C24.A24.C24.C24.C24.C24.C24.C24.C24.C24.

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22.3A22.3C22.3A22.3A22.3C22.3C22.3A2$8.A74.A24.A49.A649.A49.A24.A74.A

$3.A75.A$5.2A23.2C24.C47.A50.A$4.2A24.C.C22.2C23.3A23.2A23.2C24.A$6.A

23.C24.C.C22.A24.2A24.C.C22.2A23.3C23.2C23.2C24.C$81.A25.A23.C24.A.A

22.C24.2C24.C.C22.2C23.3C23.2C23.2C24.C$182.C25.C23.C24.C.C22.C24.2C

24.C.C22.2C23.3C23.2C23.2C24.C$283.C25.C23.C24.C.C22.C24.2C24.C.C22.

2C23.3C23.2C23.2C24.C$384.C25.C23.C24.C.C22.C24.2C24.C.C22.2C23.3C23.

2C23.2C24.C$485.C25.C23.C24.C.C22.C24.2C24.C.C22.2C23.3C23.2C23.2C24.

C47.A50.A24.A$586.C25.C23.C24.C.C22.C24.2C24.C.C22.2C23.3C23.2A23.2C

24.A98.A$687.C25.C23.C24.C.C22.C24.2A24.C.C22.2A23.3A23.2C23.2C24.A$

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24.2A510.2A$41.2A24.2A510.2A6$10.A24.C24.C24.C24.C24.C24.C24.C24.C24.

C24.C24.C24.C24.C24.C24.C24.C24.C24.A24.C24.A24.C24.C24.C24.C24.C24.C

24.C24.C24.C24.C24.C24.C24.C24.C24.C24.C24.C24.A$9.A24.C24.C24.C24.C

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24.C24.C24.C24.C24.C24.C24.C24.C24.C24.C24.C24.C24.C24.C24.C24.C24.A$

9.3A22.3C22.3C22.3C22.3C22.3C22.3C22.3C22.3C22.3C22.3C22.3C22.3C22.3C

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3C22.3C22.3C22.3C22.3C22.3C22.3C22.3C22.3C22.3C22.3C22.3A2$3.A4.A449.

A49.A449.A$5.2A23.2C24.C$4.2A24.C.C22.2C23.3C23.2C23.2C24.C$6.A23.C

24.C.C22.C24.2C24.C.C22.2C23.3C23.2C23.2C24.C$81.C25.C23.C24.C.C22.C

24.2C24.C.C22.2C23.3C23.2C23.2C24.C98.A$182.C25.C23.C24.C.C22.C24.2C

24.C.C22.2C23.3C23.2C23.2C24.A47.A$283.C25.C23.C24.C.C22.C24.2C24.C.C

22.2A23.3C23.2A23.2C24.C$384.C25.C23.C24.A.A22.C24.2A24.C.C22.2C23.3C

23.2C23.2C24.C$485.C25.A23.C24.C.C22.C24.2C24.C.C22.2C23.3C23.2C23.2C

24.C$586.C25.C23.C24.C.C22.C24.2C24.C.C22.2C23.3C23.2C23.2C24.C98.A$

687.C25.C23.C24.C.C22.C24.2C24.C.C22.2C23.3C23.2C23.2C24.A$788.C25.C

23.C24.C.C22.C24.2C24.C.C22.2A$889.C25.C23.C24.A.A5$377.2A$377.2A542.

2A$921.2A2$D3.D.D2.2D2.2D366.3D.D8.3D62.3D46.3D65.3D.D8.3D318.D2.D.3D

38.D3.D.D2.2D2.2D$2D.2D.D.D3.D369.D2.D4.D2.D65.D2.D45.D2.D65.D2.D4.D

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2D2.2D!