Industry NewGRF How to limit production?

[ebla71]

Have a problem with an industry NewGRF I'm currently working on:

I want to limit the production of a cargo in the sense that if a certain amount of it is already waiting to be transported, no more is produced until the amount waiting has dropped again below some value, in order to avoid the sometimes ridiculously high amounts of cargo around at certain stations, in particular for the primary industries.

I'm trying to use the code fragment below, but nothing is produced at all

My problem is that I am not even sure if the problem is from the produce() function or the switch block, so that produce is never even reached?!?

Or is it already the produce_cargo_arrival function, since I also want to produce MILK also with no other cargo arriving, maybe just FMSP later to boost production.

(There is additional code in the property and graphics sections but I believe that is irrelevant here)

Code: Select all

produce(Cow_Farm_prod_cb1, [],	[MILK: 16;])

produce(Cow_Farm_empty_prod, [], [])

switch(FEAT_INDUSTRIES, SELF, Cow_Farm_prod_cb0, produced_cargo_waiting("MILK"))
 {
		0..10000: Cow_Farm_prod_cb1;
		Cow_Farm_empty_prod;
 }

item(FEAT_INDUSTRIES, Cow_Farm, 21) {
  property {
            cargo_types: [accept_cargo("FMSP"), produce_cargo("MILK",0), produce_cargo("LVST",0)];
  }
  graphics {
    		produce_cargo_arrival: 		Cow_Farm_prod_cb0;
  }
}

[PikkaBird]

produce_cargo_arrival will only activate when a cargo is delivered, so yes, if you want regular production (and then test for stockpiled FMSP for a potential boost), you'll want to use produce_256_ticks instead.

produced_cargo_waiting also does not do what you think it does - it's not checking for cargo on surrounding stations, just for produced cargo held within the industry itself (which I think only happens during the production callback, if you're running it multiple times). OTOH, the mechanic you're describing, to distribute less cargo to stations which are not efficiently carrying it away, already exists in the base game - stations with poor ratings get less cargo.

[ebla71]

produce_cargo_arrival will only activate when a cargo is delivered, so yes, if you want regular production (and then test for stockpiled FMSP for a potential boost), you'll want to use produce_256_ticks instead.

Thank you very much - with the other suggested function, it now generally works as intended (not to produce any more of a cargo if a certain threshold value waiting is exceeded), although I still have to optimize the parameters a bit further.

In that context another question:

Is it possible to individually adjust the "cargo aging" for each industry separately in the sense of "time in which a cargo disappears from a station if it is not picked up within a certain time interval"?!?

For example, coal and ore can be around without turning old and bad for years, if not decades while milk obviously will age within hours or days if not processed.

So I want certain "durable" cargos bascially to stay around forever if not picked up while others to "age" normally or even more quickly than in the standard game.