Same install, different ID values?

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Flexico

Flexico

Well-Known Member
Dec 15, 2012
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While putting together my collection of mods, I made a survival world when I had just a few mods installed, and added mods as i thought of them. After getting my collection together, I started a new world to get all the added worldgen, and put all the important stuff from my old world in a bunch of diamond chests and used MCEdit to transfer it to the new world -- only to find out that my diamond chests had turned to molten nickel.

After a little troubleshooting, I found that the separate woldsaves had different ID's for the same items, even though they both play fine in the same MC install! How and why did this happen? I suspect it has something to do with 1.7.10's partially implemented item name system combined with the gradual addition of new mods, but i don't know for sure. I tried using NEI's load/save system to transfer my inventory over, and had similar problems.
 
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immibis

New Member
Jul 29, 2019
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1.7.10 provides no guarantee that IDs are the same between worlds. Forge completes the item name system; it is not partially implemented except in vanilla. MCEdit is the broken thing here.

Just write down the items you had in your chest, and spawn them in the new world (with NEI cheat mode).
 
T

tedyhere

New Member
Jul 29, 2019
1,286
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The ID's are generated as the modpack loads the first time, so adding in new mods after generating a world over time they will load up their id's in the order you added them to the end of the list. Whereas in a fresh world or install they will go into the list in the proper modloading order.
 
asb3pe

asb3pe

New Member
Jul 29, 2019
2,704
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This is really messed up behavior, but good to know I guess. I've already seen one instance where someone was asking for help about an item, and they said it was Item ID 5505. When I looked in my game, the Item ID was 5748, so we assumed that he had a big problem with his install and I suggested he delete it and reinstall it all again from scratch which didn't help. I guess now I understand why it didn't help.
 
R

ratchet freak

Well-Known Member
Nov 11, 2012
1,198
243
79
there should be a mapping file in the save folder where the mappings are setup,

you may need to use that to translate between saves
 
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