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[The Scout]

I want to make smelting cobalt make iron some of the time, and nickel msot of the time. How would I do this and would I have to regen the world?

[NecroRebel]

Depends on what numbers you want for "some of the time" and "most of the time." It is doable, however, and I don't think it will require a world regeneration.

Find cobaltite in inorganic_stone_minerals.txt in your data/save/appropriate region/raw folder. Add the following to that entry:

[METAL_ORE:IRON:25]
[METAL_ORE:NICKEL:75]

With these numbers, 25% of the time when you smelt a cobaltite you will get an iron bar, and 75% of the time you will get a nickel bar. Note that these are separate; you will get both or neither, respectively, 18.75% of the time. Change the numbers if you want to change the chances. It is not possible to make it such that it produces only one at a time AFAIK.

[The Scout]

But one of the copper ore makes copper 100% of the time and silver 10% of the time, or am I being stupid?

[NecroRebel]

But one of the copper ore makes copper 100% of the time and silver 10% of the time, or am I being stupid?

Tetrahedrite, yes. It's actually 100/20, but that's exactly what I did there. Tetrahedrite has [METAL_ORE:COPPER:100][METAL_ORE:SILVER:20]. It will produce copper every time you run the reaction, and 20% of the time when you run the reaction you'll also get silver. With tetrahedrite, there's no chance at all of getting only silver since it's a 100% ore of copper, but if it wasn't a 100% copper ore you could get neither, both, one, or the other, same as the cobaltite mod I suggested.

[The Scout]

It's just me being stupid then. I thought you meant the chances we're averaged, and you'd either get none or all.

[NecroRebel]

Ah. No, with the numbers I suggested you'd get nothing 18.75% of the time, just nickel 56.25% of the time, just iron 6.25% of the time, and both nickel and iron 18.75% of the time. Different numbers would mean different results of course. It's just 2 completely unrelated random numbers chosen, one for nickel and one for iron, and as long as the chances for neither are 100% you occasionally will get bad rolls on both.

[Mechanixm]

You will also need the appropriate reaction added to the reaction_smelter.txt file and that same permitted reaction added to your entity_default.txt.

Reaction:

[REACTION:COBALTITE_SMELTING]
[NAME:Smelt Cobaltite]
[BUILDING:SMELTER:NONE]
[REAGENT:A:1:BOULDER:NO_SUBTYPE:INORGANIC:COBALTITE]
[PRODUCT:100:1:BAR:NO_SUBTYPE:METAL:NICKEL][PRODUCT_DIMENSION:150]
[PRODUCT:5:1:BAR:NO_SUBTYPE:METAL:IRON][PRODUCT_DIMENSION:150]
[FUEL]
[SKILL:SMELT]


entity_default:

[PERMITTED_REACTION:COBALTITE_SMELTING]


I'm pretty sure this will need a world regen.

[Alem]

From what I recall as per Mechanixm's suggestion, while that would be one potential means of accomplishing the task you do not need to implement both. With NecroRebel's suggestion, it will automatically be added to the smelter. All ores, even when of custom metals, have the appropriate reaction automatically produced in game. The only time adding a custom reaction to the smelter is necessary is for alloys or non-standard smelting processes (such as turning balls of cotton candy string into cotton candy wafers)

[Deon]

You will also need the appropriate reaction added to the reaction_smelter.txt file and that same permitted reaction added to your entity_default.txt.

Reaction:

[REACTION:COBALTITE_SMELTING]
[NAME:Smelt Cobaltite]
[BUILDING:SMELTER:NONE]
[REAGENT:A:1:BOULDER:NO_SUBTYPE:INORGANIC:COBALTITE]
[PRODUCT:100:1:BAR:NO_SUBTYPE:METAL:NICKEL][PRODUCT_DIMENSION:150]
[PRODUCT:5:1:BAR:NO_SUBTYPE:METAL:IRON][PRODUCT_DIMENSION:150]
[FUEL]
[SKILL:SMELT]


entity_default:

[PERMITTED_REACTION:COBALTITE_SMELTING]


I'm pretty sure this will need a world regen.

You do not need a reaction if you add METAL_ORE to minerals.

[The Scout]

Do I need to regen? It's not showing up in the smelter list.

[Nobbins]

You got it all wrong. The reaction will work, but it's periodic, not random. 75% nickel will give the smelter 75 nickel, every time. Every time you get 100 nickel, it spits out a bar of nickel and carries over the remainder. So you should get no bars the first smelt, a nickel for the second and third, and nickel and iron on the fourth. This repeats.

[NecroRebel]

Do I need to regen? It's not showing up in the smelter list.

I just tested it, and I didn't need a regen. Did you alter the save file's raws? The main raws don't affect saved games.

You got it all wrong. The reaction will work, but it's periodic, not random. 75% nickel will give the smelter 75 nickel, every time. Every time you get 100 nickel, it spits out a bar of nickel and carries over the remainder. So you should get no bars the first smelt, a nickel for the second and third, and nickel and iron on the fourth. This repeats.

Toady One disagrees with you:

How do the reactions work at the smelter?  Are they percentage probability or percentage completion?  Popular opinion had it that they are percentage completion but testing by a couple of us in the modding forum indicated that it was percentage probability with some weighting from unknown sources.  It was definitely not percentage completion weighted by same operator/same smelter.  We decided that only Tarn Adams could answer the question.  This is relevant in this thread because the new custom shops will undoubtedly be using the same sorts of reactions.  This is a hugely important feature in the new version, for some of us.

The way it works currently, which is open to additions of course, it to go through each product, and if it clears the chance (a single roll), it gives you all of the number.  It doesn't roll the chance for each individual one of a given product, and no invisible partial products are stored.  If you have odd numbers of reagents coming in (like lots of extra), you can get extra product, but the single chance must be cleared first.  So pretty much the clunkiest, most simple interpretation.

[_DivideByZero_]

How about testing it on a quick pocket world? I'm exhausted and I almost maimed myself with power tools trying to fix my crossbow, so I'm not in the mood to test it right now. Good luck!