(1.18.2) Gravel loot table ... how to modify?

[badkraft]

Here's the default loot table for gravel block:

{
  "type": "minecraft:block",
  "pools": [
    {
      "rolls": 1.0,
      "bonus_rolls": 0.0,
      "entries": [
        {
          "type": "minecraft:alternatives",
          "children": [
            {
              "type": "minecraft:item",
              "conditions": [
                {
                  "condition": "minecraft:match_tool",
                  "predicate": {
                    "enchantments": [
                      {
                        "enchantment": "minecraft:silk_touch",
                        "levels": {
                          "min": 1
                        }
                      }
                    ]
                  }
                }
              ],
              "name": "minecraft:gravel"
            },
            {
              "type": "minecraft:alternatives",
              "conditions": [
                {
                  "condition": "minecraft:survives_explosion"
                }
              ],
              "children": [
                {
                  "type": "minecraft:item",
                  "conditions": [
                    {
                      "condition": "minecraft:table_bonus",
                      "enchantment": "minecraft:fortune",
                      "chances": [
                        0.1,
                        0.14285715,
                        0.25,
                        1.0
                      ]
                    }
                  ],
                  "name": "minecraft:flint"
                },
                {
                  "type": "minecraft:item",
                  "name": "minecraft:gravel"
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}

This is a finicky loot table. If I add anything to it, nothing drops. I've added pools, entries, children ... you name it.

Does anyone know the particulars about this table? I mean, periodically gravel drops flint instead of a gravel block. I understand the condition that could drop flint if the block survives an explosion. Otherwise, it drops the gravel block itself. I would like to further understand why the use of `children` and the set of `chance` values given in the explosion child entry.

What I do understand is that `"type" : "minecraft:alternatives"` means that if this child/entry is successful, then it stops generating loot for this entry/pool.

How often does the flint drop and is that taken care of in another location? Is that in a `"condition" : "minecraft:table_bonus"` loot table? Hmmm... I'll have to go take a look and see if there is something called table_bonus.json.

[Warren Tode]

The information you're looking for is found here, on Loot Tables:

https://minecraft.fandom.com/wiki/Loot_table

And here, on Predicates:

https://minecraft.fandom.com/wiki/Predicate

So specifically, in this case, the Table Bonus is the probability parameters being set for the drops in regards to the Fortune enchantment.

Survives explosion sets the probability of getting the block when an explosion occurs within the built in radius. If this isn't set, it's always successful.

Not sure what else you need to know, but I'm sure you can find it on those two pages and whatever other links on them.

Edited January 29, 2023 by Warren Tode

[badkraft]

I read both of those and with the help of an online loot table generator, I was able to see how it is constructed. I ended up successfully modifying the gravel loot table. Thanks...

{
    "type": "minecraft:block",
    "pools": [
        {
            "rolls": 1,
            "bonus_rolls": 0,
            "entries": [
                {
                    "type": "minecraft:alternatives",
                    "children": [
                        {
                            "type": "minecraft:item",
                            "name": "minecraft:gravel",
                            "conditions": [
                                {
                                    "condition": "minecraft:match_tool",
                                    "predicate": {
                                        "enchantments": [
                                            {
                                                "enchantment": "minecraft:silk_touch",
                                                "levels": {
                                                    "min": 1
                                                }
                                            }
                                        ]
                                    }
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "minecraft:flint",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.45
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "minecraft:coal",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.20
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "foundations:iron_nugget_ore",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.057
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "foundations:clay_ore",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.038
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "minecraft:raw_iron",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.0075
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "foundations:gold_nugget_ore",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.0025
                                }
                            ]
                        },
                        {
                            "type": "minecraft:alternatives",
                            "conditions": [
                                {
                                    "condition": "minecraft:survives_explosion"
                                }
                            ],
                            "children": [
                                {
                                    "type": "minecraft:item",
                                    "name": "minecraft:flint",
                                    "conditions": [
                                        {
                                            "condition": "minecraft:table_bonus",
                                            "enchantment": "minecraft:fortune",
                                            "chances": [
                                                0.1,
                                                0.142387,
                                                0.25,
                                                1.0
                                            ]
                                        }
                                    ]
                                },
                                {
                                    "type": "minecraft:item",
                                    "name": "minecraft:gravel"
                                }
                            ]
                        }
                    ]
                }
            ]
        }
    ]
}
{
    "type": "minecraft:block",
    "pools": [
        {
            "rolls": 1,
            "bonus_rolls": 0,
            "entries": [
                {
                    "type": "minecraft:alternatives",
                    "children": [
                        {
                            "type": "minecraft:item",
                            "name": "minecraft:gravel",
                            "conditions": [
                                {
                                    "condition": "minecraft:match_tool",
                                    "predicate": {
                                        "enchantments": [
                                            {
                                                "enchantment": "minecraft:silk_touch",
                                                "levels": {
                                                    "min": 1
                                                }
                                            }
                                        ]
                                    }
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "minecraft:flint",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.45
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "minecraft:coal",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.20
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "foundations:iron_nugget_ore",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.057
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "foundations:clay_ore",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.038
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "minecraft:raw_iron",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.0075
                                }
                            ]
                        },
                        {
                            "type": "minecraft:item",
                            "name": "foundations:gold_nugget_ore",
                            "conditions": [
                                {
                                    "condition": "minecraft:random_chance",
                                    "chance": 0.0025
                                }
                            ]
                        },
                        {
                            "type": "minecraft:alternatives",
                            "conditions": [
                                {
                                    "condition": "minecraft:survives_explosion"
                                }
                            ],
                            "children": [
                                {
                                    "type": "minecraft:item",
                                    "name": "minecraft:flint",
                                    "conditions": [
                                        {
                                            "condition": "minecraft:table_bonus",
                                            "enchantment": "minecraft:fortune",
                                            "chances": [
                                                0.1,
                                                0.142387,
                                                0.25,
                                                1.0
                                            ]
                                        }
                                    ]
                                },
                                {
                                    "type": "minecraft:item",
                                    "name": "minecraft:gravel"
                                }
                            ]
                        }
                    ]
                }
            ]
        }
    ]
}

I treat gravel as a filter catch-all. Some extra minor drops - adding some nugget ores so you don't get iron ores dropping from gravel except on rare occurrence. Clay ore is a new item I've implemented that drops from a new clay block added to regular clay generation.

 

...edited the loot table. It was an older one while I was building it. This one is the complete loot table.

Edited January 29, 2023 by badkraft