[1.19.2] How to set properly getMinCost and getMaxCost on Enchantment

[Adil Yilan]

I've been reading about enchanting mechanics here: https://minecraft.fandom.com/wiki/Enchanting_mechanics

Table says that if you have 15 bookshelves, following rules should be applied:

Level range of top slot -> 2 - 10

Level range of middle slot -> 6 - 21

Level range of bottom slot -> 30

I have defined following values for minCost and maxCost for my item (just for the sake of the testing):

	@Override
	public int getMinCost(int pLevel) {
		return 11;
	}

	@Override
	public int getMaxCost(int pLevel) {
		return 21;
	}

Enchantment has only 1 level.

And I ended up with having enchantment shown in two slots at the same time on the enchanting table:

* At top slot with cost of 8

* At middle slot with cost of 14

At first I thought you configure how much item might cost - but how did I end up with having option with cost of 8 when min value is 11?

Then I thought it has to do with levels, but if top slot is 2-10, why is it shown if min value is set to 11?

What exactly are these getMinCost and getMaxCost values used for?

Thanks for any assistance in advance.

 

 

 

 

[vemerion]

You also have to take item enchantability into account: https://minecraft.fandom.com/wiki/Enchanting_mechanics#Enchantability

[Adil Yilan]

@vemerion I did, but still can't figure out exactly how to set these values and what is exact meaning of them.

Some enchantments have these values set to very large values that I didn't see anywhere in the game.

For example, BLOCK_EFFICIENCY for level 5 returns following values:

getMinCost => 41

getMaxCost => 101

So it's most likely some type of range - but how and where is it used is what I don't understand...

I am supposed to set these values in my enchantments to something meaningful, but don't know how.

[warjort]

I don't really understand all the details of this, it is based on random numbers and a weird algorithm. 🙂

I think most people just choose a vanilla enchantment they want to be similar to and tweak its cost calculation?

 

If you really want to understand it:

The basic idea is that it calculates an enchantment cost for each slot in EnchantmentHelper.getEnchantmentCost() - uses some random numbers.

p_220289_ is the slot number (0 to 2) and p_220290_ is the enchanting power of the "bookshelves".

 

Then it runs selectEnchantment() for each slot

p_220300_ is the cost(s) from above, but it gets modified using some more random numbers.

 

This then uses getAvailableEnchanmentResults() with the modified p_220300_ to compare against your min/max costs.

 

That wiki has a link to a table that has values from 1.14

https://minecraft.fandom.com/wiki/Enchanting/Levels