Where in the code can I find a drop list for items?

psyxypher · 2018-05-17T00:11:31.827Z

This is a problem I’ve had for a while now: I have no idea where to find the drop rates for all of the item groups. I might get lucky and find one group in one place, but not be able to find another group in another place. It’s very frustrating when you’re say, trying to figure out your chances of getting an item you really want.

EDIT: I’m looking for the Grenade section, if it helps. Trying to gauge my chances of finding a Granade (got to get my natural STR over 30 somehow!)

BorkBorkGoesTheCode · 2018-05-17T00:33:10.028Z

grenades itemgroup is still in data/json/item_groups.json with several other legacy itemgroups. Here’s the “grenades” group:

{
    "type" : "item_group",
    "id" : "grenades",
    "items":[
      ["grenade", 30],
      ["grenade_inc", 30],
      ["flashbang", 30],
      ["EMPbomb", 20],
      ["gasbomb", 15],
      ["gasbomb_makeshift", 15],
      ["smokebomb", 50],
      ["dynamite", 50],
      ["mininuke", 5],
      ["c4", 50],
      ["tool_black_powder_bomb", 10]
    ]
  },

Granades were moved to Crazy Cataclysm and have 1 spawn ticket in the grenades group.

Most itemgroups are located within data/json/item_groups.json, data/json/itemgroups folder, or the mapgen files in which they are used.

psyxypher · 2018-05-17T00:37:11.008Z

And they probably don’t work the same way they did in the days of Marloss Man Reborn, let’s be fair. Despite the fact that they’re nigh-impossible to find. >.>

What is that spawn chance? 1 to 305?

BorkBorkGoesTheCode · 2018-05-17T01:00:07.765Z

github.com

CleverRaven/Cataclysm-DDA/blob/master/doc/ITEM_SPAWN.md

# Item spawn system

## Collection or Distribution

In a Collection each entry is chosen independently from the other entries. Therefore the probability associated with each entry is absolute, in the range of 0...1. In the json files it is implemented as percentage with values from 0 to 100.

A probability of 0 (or negative) means the entry is never chosen, a probability of 100% means its always chosen. The default is 100, because it's the most useful value. Default 0 would mean the entry can be removed anyway.

A Distribution is a weighted list like the current system. Exactly one entry is chosen from it. The probability of each entry is relative to the probability of the other entries. A probability of 0 (or negative) means it is never chosen.

An example: Suppose item A has a probability of 30 and item B has a probability of 20. Then the probabilities of the 4 combinations of A and B are:


| Combination     | Collection | Distribution |
| ----------------|------------|------------- |
| Neither A nor B | 56%        | 0%           |
| Only A          | 24%        | 60%          |
| Only B          | 14%        | 40%          |
| Both A and B    | 6%         | 0%           |

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