[0.16.49] More than one loader per tile is not save-stable

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[0.16.49] More than one loader per tile is not save-stable

Postby eradicator » Thu Jul 12, 2018 7:12 am

I can already hear the "just don't do this"...but bear with me. Please. I'm posting this soley because of possible determinism concerns.

In a neighbouring thread we discussed the possibility of a loader-based N-splitter to complement the 2-splitter in base.

I did various experiments and thought i ended up with a working 1x1 3-splitter, but i just couldn't get it to stabilitze when not built manually. So yet another hour later i've determined that more than one splitter per tile works only if constructed in a very particular order, and only while the game is running. As soon as you load the game it breaks! And loading should never affect the game-state as far as i understand.

I've attached a video in case anyone thinks this is a photoshop joke. (A gif would be too large)
er-one-tile-per-loader-bugreport.jpg
er-one-tile-per-loader-bugreport.jpg (202.64 KiB) Viewed 97 times

Demo mod (contains minified loader and reduces chest collision_box):
er-one-tile-per-loader-bugreport_0.0.1.zip
(4.55 KiB) Downloaded 2 times

Demo savegame (it's not save stable, so this is the broken one...):
bugreport_one-tile-per-loader.zip
(934.5 KiB) Downloaded 2 times

Demo video (zipped because forum doesn't like .mkv):
er-one-tile-per-loader-bugreport-video.zip
(7.45 MiB) Downloaded 3 times


How to reproduce:
  1. Load the attached save+mod.
  2. Remove the inputting loader (west side), place it back down (blue side towards belt), rotate it to "input" mode.
  3. Remove and replace the inputting belt segment.
  4. Now it's a bit fiddly...
  5. Remove one of the other loaders (north/south work best) and place it back down. Then replace the belt segment that loader is connected to. If it worked continue. If it didn't try another loader+belt pair first.
  6. Do so for the other two loader+belt pairs.
It's important to rebuild the belt right after the loader. Rebuilding all loaders and after that all belts doesn't work.
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