Hey everyone!

I want to change the amount of vanilla ore is generated in the world based on an amount put in the minecraft configuration. I think I need to use an event to catch right before the ore is about to be spawned in, but I don't know what event it would be. Am I even using the right approach? Any help is appreciated.

Thanks!

Yes there is a whole event bus dedicated to ore generation with the following events:

GenerateMinable

OreGenEvent.Pre

OreGenEvent.Post

 

Also, you can do block replacements during chunk loading events as well.

 

I'm not sure how familiar you are with event handling, so if you are new to it you might want to check out my tutorial: http://jabelarminecraft.blogspot.com/p/minecraft-forge-172-event-handling.html

Yes there is a whole event bus dedicated to ore generation with the following events:

GenerateMinable

OreGenEvent.Pre

OreGenEvent.Post

 

Also, you can do block replacements during chunk loading events as well.

 

I'm not sure how familiar you are with event handling, so if you are new to it you might want to check out my tutorial: http://jabelarminecraft.blogspot.com/p/minecraft-forge-172-event-handling.html

I actually learned about events from your tutorials. Thank you for making them!

I think I know what I need to do but how exactly do I find the blocks being populated since the event only gives an X and Z coord and .getBlock() requires a Y? I thought of doing a random but figured it wouldn't work out well.

I don't know that much about ore generation actually.  I concentrate most of my modding on entities and items.

 

From briefly looking at the code, I think the idea is that the BiomeDecorator class has a method called generateOres() which posts the OreGenEvent.Pre event and then calls the TerrainGen.generateOre() method for each mineable type.  This generateOre() method takes a WorldGenMineable parameter for each mineable type such as dirtGen, gravelGen, coalGen, ironGen, etc as well as the X and Z position.  The WorldGenMineable has a generate() function which uses a bunch of loops to create clusters of the mineable type.

 

The TerrainGen.generatOre() method is pretty much just a hook into the events.  It creates the GenerateMineable event and posts it.  The event is not cancelable, however it does have a result -- this means that it is possible for your event handler to give a Result.DENY to prevent the generation.  I'm not certain but I think this would allow you to substitute your own ore generation -- give a DENY result but also call your own generation method.

 

I'm sure there are good ore generation tutorials out there but I think you could try the following:

1) if you just want to add your own extra ore generation, you can just handle the OreGenEvent.Pre or .Post and call your own WorldGenMineable. 

2) if you want to substitute your own and prevent some vanilla gen, then you'd handle the GenerateMineable event and send a DENY result, and also call your own WorldGenMineable.

 

Anyway, look at the code in the classes and methods I mention above and it should give you some idea.