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Recipes

GTCEu has a great recipe structure. Adding and removing is pretty much the same for each machine. Recipes for a machine are stored in a RecipeMap. You can get a recipe map like this:

groovy
def recipeMap = mods.gregtech.recipe_map_name
// this works also:
def recipeMap2 = recipemap('recipe_map_name')

You can find a list of all machines here.
Let's use alloy_smelter as an example here. With the recipe map you can create a recipe builder.

groovy
mods.gregtech.alloy_smelter.recipeBuilder()

You don't know what a builder is? Check this out.

Builder functions

GregTechs recipe builder has tons of helper functions. We'll only focus on the important ones.

Adding inputs

Works for fluid and items

groovy
inputs(IIngredient ingredient)
inputs(IIngredient... ingredients)
inputs(Collection<IIngredient> ingredients)
notConsumable(IIngredient ingredient) // this will not be consumed

Adding outputs

groovy
outputs(ItemStack)
outputs(ItemStack...)
outputs(Collection<ItemStack>)
chancedOutput(ItemStack, int chance, int tierChanceBoost) // this will not be consumed

fluidOutputs(FluidStack)
fluidOutputs(FluidStack...)
fluidOutputs(Collection<FluidStack>)

Other

groovy
duration(int duration) // base recipe duration int ticks (20 ticks = 1 sec)
EUt(int EUt)
hidden() // hides recipe in jei

cleanroom(CleanroomType) // makes the recipe require cleanroom

Register recipe

groovy
buildAndRegister()

Example

groovy
import gregtech.api.metatileentity.multiblock.CleanroomType // needed when you want to use cleanroom

mods.gregtech.alloy_smelter.recipeBuilder()
    .inputs(item('minecraft:dirt'), ore('stone'))
    .outputs(item('minecraft:nether_star') * 2)
    .cleanroom(CleanroomType.CLEANROOM) // CLEANROOM and STERILE_CLEANROOM are valid
    .duration(200) // 10 seconds
    .EUt(512) // HV recipe
    .buildAndRegister()

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