Topic category: Help with modding (Java Edition)
is there any way/easy ways to
import/replicate blocks/items /families of items and blocks / behavior from different versions? (example cherry trees/wood/ or iron, ores, tools etc ) without adding everything manually
Change the behavior of a block or duplicate the block to edit the behavior of the new block without starting from zero (example, change blast furnace to have extra input materials , two or more)
Remove game features/ change game features / insert game features from previous/different versions (in world create menu: day/night duration , hunger on/off , food heals like in 1.7 and prior , hunger replaced by stamina and rules for food items changed) by importing and changing the code instead of creating the features from nothing in the gui .
The goal (among others) is to add 1.20 items and old mechanics to version 1.15
There aren't really good ways to simply import stuff from newer versions to older versions. (Even if you could, the code changes enough between versions that they likely wouldn't function.) If it's just assets you need though, you can use MCAssets to get images, sounds, loot tables, etc. For most stuff, however, you'll have to update it manually.
You also cannot remove existing features of the game. Mods are only ever able to add stuff to the game, not make direct changes to the base game itself. However, there are still workarounds to remove stuff without actually altering the code. (Such as a procedure that replaces a mob with a different mob whenever it spawns.) That sort of thing.