Creating items
The simplest way
content.createItem(String name).register()Simple right? Let's break it up:
contentis a global variable.createItem(String name)creates an item and returns it. The name is the registry name and must only consist of lower case letters and_.register()registers the item. Without this the item will not appear in game.
Registering an item
The example above creates a simple item for you, but you can also create items yourself (to create custom behaviour). Use the following methods to register custom items.
content.registerItem(String name, Item item)Texture
Minecraft's items need a texture (or multiple) and a model file which describes how the textures are rendered. If groovy can't find a model file it will generate a default file at .minecraft/groovy/assets/[pack id]/models/item/[item name].json. It will point to a texture you will need to place at .minecraft/groovy/assets/[pack id]/textures/items/[item name].png.
Translating the items name
By default, the items name will show up as item.[pack id].[item name].name. To change that you need add an entry to the lang file. GroovyScript generates a default lang file at .minecraft/groovy/assets/[pack id]/lang/en_us.lang.
Example
First create an item
content.createItem('heart_of_the_universe')Let's assume that the pack id is nomifactory so that the item id will be nomifactory:heart_of_the_universe. Insert this line into the lang file.
item.nomifactory.heart_of_the_universe.name=Heart of the universe(item.nomifactory.heart_of_the_universe.name is the default generated translation key. You can change to anything you want.)
Finally, put a texture at .minecraft/groovy/assets/nomifactory/textures/items/heart_of_the_universe.png
Waiting Idly
Nullpinter