Hello. I'm making my first mod. I'm trying to make some block spawn in caves. I wrote a class, that extends Feature class, but how do I made spawn it in the world? I don't know anything about world generation, and I don't know where should I take information from. Thank you very much

It depends what version of forge you are using. The old way (1.18 and before) is to use BiomeLoadingEvent. Then use 

event.getGeneration().addFeature()

to add it to the appropriate GenerationStep.

For an example, here is Botania adding mystical flowers and mushrooms to the vegetation step

https://github.com/VazkiiMods/Botania/blob/0cfa08ebb4828aa48b3231d6db6dd3b70dc7942b/Forge/src/main/java/vazkii/botania/forge/ForgeCommonInitializer.java#L250 

Of course you need to register your features to make them useful, see

https://github.com/VazkiiMods/Botania/blob/0cfa08ebb4828aa48b3231d6db6dd3b70dc7942b/Xplat/src/main/java/vazkii/botania/common/world/ModFeatures.java

 

1.19 (still in beta) has overhauled this to use BiomeModifiers:https://forge.gemwire.uk/wiki/Biome_Modifier

Quote

This is not ideal. The recommended way to register things is using DeferredRegister, which also provides you with the Holder.

Pretty sure it does it that way because it shares the same code with the fabric implementation which doesn't have deferred registration.

Do you know a good example?

I just tried to find a good example in well known mods and they seem to use a variant of the RegistryEvent/manual register like botania, except mekanism which has its own specialised FeatureDeferredRegistry implementation.

Edited June 29, 20223 yr by warjort

first of all guys, did you read the version of this thread, it's 1.16.5 there are not Holders, etc?

 

2 hours ago, KastyaLimoness said:

I'm trying to make some block spawn in caves.

like Ores? If so, you don't need a custom Feature you can use Feature.ORE instead
create a static ConfiguredFeature field, then create the ConfiguredFeature in FMLCommonSetupEvent and store it in your field
you then be able to use BiomeLoadingEvent to add the Feature to the World

you can create the ConfiguredFeature via Feature#configured
you can use the vanilla Features class as an example

 

1 hour ago, warjort said:

Do you know a good example?

why do you need a example?
if you provide a example it is helpful but you should know that a few people will copy the code without understanding what the code is doing
and then they come back and say the code is not working (they turn off their brain)
if you want to show examples i would recommend you to use the examples which are provied by Forge in the Forge Community Wiki,
or you create a standalone example (for example with https://gist.github.com/), which you then can link

if you want an example for Features & Placements you can take at: Features & Placements

Edit: in the most cases there are vanilla examples and for the stuff which is added by Forge you can take a look at the Test Mods

Edited June 29, 20223 yr by Luis_ST

2 hours ago, Luis_ST said:

like Ores?

No, something like flower, but in underground

Thank you, guys, for your help, but I've just invented a strange bycicle and now all works