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New Loot Table features in 1.14

This gist covers the changes to loot tables introduced in 18w43a, the first 1.14 snapshot. Check out this more in-depth loot table guide.

Last updated: 18w49a

Table of contents

• Loot table types
• Random integers
• Entry types
• New conditions

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Minecraft commands benchmarks

Each test ranks a list of possible commands from best (most efficient) to worst (least efficient). Lower percentages are better. You can only compare the percentages between the commands in the same test.

These tests were done in a superflat world with no entities except for the player. The only commands running are the ones from the test.

1 Running commands for every player

1.1 All players

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Generator Settings

20w21a

Table of Contents
Noise size_horizontal and size_vertical density_factor and density_offset sampling top_slide and bottom_slide
Structures spacing and separation salt

External Links

• Wiki Documentation

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• MinecraftServer::tickServer
  • ServerFunctionManager::tick
    • Run command functions
      • Trigger inventory_changed (loot, give, clear commands)
      • Trigger recipe_unlocked (recipe command)
      • Trigger effects_changed (effect command)
      • Trigger changed_dimension (teleport command)
  • ServerLevel::tick (per dimension)
    • ServerLevel::tickTime (overworld only)
• Increment game time

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Custom data pack structures in 1.18.2

This guide will showcase how to create a data pack that adds a custom structure to the world. There is also a data pack download of this complete example.

Always leave the world and rejoin to apply the new changes!

⚠️ This guide has moved ⚠️

Updates for both 1.18.2 and 1.19 can be found at https://misode.github.io/guides/adding-custom-structures/

Pack.mcmeta

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Critical

• MC-215946 Game fatally crashed while exploring chunks (PalettedContainer)
• MC-197860 Deleting a custom dimension in a datapack deletes Nether and End
• MC-202036 Adding a biome to a datapack shifts biome IDs in existing chunks

Missing features

• MC-197128 If a custom biome uses multiple configured structure features of the same type, only one of them can generate
• MC-186626 /weather not working in custom dimensions
• MC-195717 Custom Dimensions JSON Requires Seed
• MC-226687 Sea Level is assumed to be Y 63 in numerous parts of Minecraft

Quality of life

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Table of Contents
Density Factor
Slides target size offset

density_factor

density_factor	density_offset
2	0

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Optimizing and code-splitting

I decided to investigate the bundle size for misode.github.io and was quite shocked. After code splitting and tree shaking I managed to get the total JS output size from 5.22MB down to 3.95MB, and the main entrypoint from 4.53MB down to 703KB.

Initial bundle

The initial bundle was 5.22MB, with the main chunk 4.53MB (the red part). The only chunks split up were the different languages localizations.

Remove unused highlight.js languages

One of the first things I noticed was that highlight.js included a bunch of languages, while I'm only using JSON. This eliminated 1.35MB.

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{
  "type": "min",
  "input_1": {
    "type": "squeeze",
    "input": {
      "type": "mul",
      "input_1": {
        "type": "interpolated",
        "input": {
          "type": "blend",

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data merge entity @s[type=minecart] {CustomDisplayTile:1,DisplayState:{Name:"minecraft:command_block",Properties:{conditional:"true",facing:"down"}},DisplayOffset:4}
data merge entity @s[type=chest_minecart] {CustomDisplayTile:1,DisplayState:{Name:"minecraft:command_block",Properties:{conditional:"true",facing:"up"}},DisplayOffset:4}
data merge entity @s[type=furnace_minecart] {CustomDisplayTile:1,DisplayState:{Name:"minecraft:command_block",Properties:{conditional:"true",facing:"north"}},DisplayOffset:4}
data merge entity @s[type=tnt_minecart] {CustomDisplayTile:1,DisplayState:{Name:"minecraft:command_block",Properties:{conditional:"true",facing:"south"}},DisplayOffset:4}
data merge entity @s[type=hopper_minecart] {CustomDisplayTile:1,DisplayState:{Name:"minecraft:command_block",Properties:{conditional:"true",facing:"west"}},DisplayOffset:4}
tag @s add invisible_minecart