Link: https://docs.papermc.io/paper/anti-xray
Help: https://discord.gg/papermc
Anti-Xray can be configured per world in the paper.yml configuration file. To understand how per world configuration works please read this first. Note that after changing any settings for Anti-Xray you have to restart your server. Executing the /reload command (you should never do this) won't apply the settings to worlds that are already loaded.
The official documentation for the Anti-Xray settings and what they mean can be found here.
Basically Anti-Xray has two different modes. engine-mode: 1 replaces specified ores by "fake" stone, netherrack or end stone blocks depending on the world type and engine-mode: 2 randomly places specified fake ores when a chunk packet is sent to the client. The following picture[1] shows how this looks like for a player using Xray on your server.
engine-mode: 1 is less computationally intensive but engine-mode: 2 works better to prevent Xray. As you can see in the picture above, engine-mode: 1 isn't perfect because only ores that are completely covered by solid blocks can be hidden. This means that ores exposed to air in caves, for example, are still visible. In engine-mode: 2 fake ores obstruct the view to these ores and additionally fake air blocks can also be added.
These are the default settings for Anti-Xray. As already mentioned above, you should take a look at the official documentation. I've added some additional info in the comments below that isn't currently there.
world-settings:
default:
# Other default world-settings.
anti-xray:
# enabled controls the on/off state for the Anti-Xray system.
enabled: false
# engine-mode is described above.
engine-mode: 1
# As of 1.15.2 build #248 chunk-edge-mode doesn't exist anymore.
# This setting isn't necessary anymore because neighbor chunks are now usually loaded anyway.
# Sets how the engine handles chunk edges.
# Where 1 is not to obfuscate the edges of chunks with unloaded neighbors,
# 2 is to not send the chunk until its neighbors are present (similar to a x-1 view distance),
# and 3 is to load the neighbor so it can properly obfuscate the current edge (similar to an x+1 view distance).
chunk-edge-mode: 2
# As of 1.17 build #1 max-chunk-section-index doesn't exist anymore.
# This setting is replaced by the max-block-height setting.
# max-chunk-section-index controls the height the engine should operate to.
# y = (max-chunk-section-index + 1) * 16
# A max-chunk-section-index greater than 15 defaults to 15. A max-chunk-section-index smaller than 0 doesn't make sense.
max-chunk-section-index: 3
# max-block-height controls the height (y-coordinate) the engine should operate to.
# Only integer multiples of 16 are possible values.
# If another value is specified, it is "rounded down" to the nearest multiple of 16.
# As of 1.18 some ores are generated much higher.
# Please adjust the max-block-height setting at your own discretion.
# https://minecraft.fandom.com/wiki/Ore might be helpful.
max-block-height: 64
# update-radius is the radius for block updates, which send the real blocks to the client when a block is broken.
# There are only 3 valid options: 0, 1 and 2.
# An update-radius greater than 2 defaults to 2. An update-radius smaller than 0 defaults to 0.
# Don't use update-radius: 0 in production. This is only a test mode.
update-radius: 2
# Whether or not to obfuscate blocks touching lava.
# Doesn't work well with non-stone-like ore textures.
lava-obscures: false
# Whether or not to enable support for the paper.antixray.bypass permission.
# Depending on your permission plugin, this may cause performance issues.
use-permission: false
# In engine-mode: 1 hidden-blocks are replaced by stone, netherrack or end_stone depending on the world type.
# all types of air blocks are ignored in this list.
# In engine-mode: 2 hidden-blocks are randomly placed.
# tile entities such as chest or spawner are ignored in this list.
# blocks can be added multiple times to this list, those are used accordingly more often.
# an empty or invalid list or a list that only contains ignored blocks results in [diamond_ore].
# the default block states are placed.
hidden-blocks:
- copper_ore
- deepslate_copper_ore
- gold_ore
- deepslate_gold_ore
- iron_ore
- deepslate_iron_ore
- coal_ore
- deepslate_coal_ore
- lapis_ore
- deepslate_lapis_ore
- mossy_cobblestone
- obsidian
- chest
- diamond_ore
- deepslate_diamond_ore
- redstone_ore
- deepslate_redstone_ore
- clay
- emerald_ore
- deepslate_emerald_ore
- ender_chest
# In engine-mode: 1 replacement-blocks are not used. Changing this list in engine-mode: 1 has no effect.
# In engine-mode: 2 replacement-blocks and hidden-blocks are randomly replaced by hidden-blocks.
# tile entities such as chest or spawner are ignored in hidden-blocks.
# tile entities can be added to replacement-blocks.
# all types of air blocks aren't be replaced regardless of where they are added.
replacement-blocks:
- stone
- oak_planks
- deepslate
# Other default world-settings.
world-settings:
default:
# Other default world-settings.
anti-xray:
enabled: true
engine-mode: 1
chunk-edge-mode: 2
max-chunk-section-index: 3
# As of 1.18 some ores are generated much higher.
# Please adjust the max-block-height setting at your own discretion.
# https://minecraft.fandom.com/wiki/Ore might be helpful.
max-block-height: 64
update-radius: 2
lava-obscures: false
use-permission: false
hidden-blocks:
# There's no chance to hide dungeon chests but buried treasures will be hidden.
- chest
- coal_ore
- deepslate_coal_ore
- copper_ore
- deepslate_copper_ore
- raw_copper_block
- diamond_ore
- deepslate_diamond_ore
- emerald_ore
- deepslate_emerald_ore
- gold_ore
- deepslate_gold_ore
- iron_ore
- deepslate_iron_ore
- raw_iron_block
- lapis_ore
- deepslate_lapis_ore
- redstone_ore
- deepslate_redstone_ore
replacement-blocks:
- stone
- oak_planks
- deepslate
# Other default world-settings.
# world_nether: needs to be changed if your world is named differently.
world_nether:
anti-xray:
max-chunk-section-index: 7
max-block-height: 128
hidden-blocks:
- ancient_debris
- nether_gold_ore
- nether_quartz_ore
# world_the_end: needs to be changed if your world is named differently.
world_the_end:
anti-xray:
enabled: false
world-settings:
default:
# Other default world-settings.
anti-xray:
enabled: true
engine-mode: 2
chunk-edge-mode: 2
max-chunk-section-index: 3
# As of 1.18 some ores are generated much higher.
# Please adjust the max-block-height setting at your own discretion.
# https://minecraft.fandom.com/wiki/Ore might be helpful.
max-block-height: 64
update-radius: 2
lava-obscures: false
use-permission: false
hidden-blocks:
# You can add air here such that many holes are generated.
# This works well against cave finders but may cause client FPS drops for all players.
- air
- copper_ore
- deepslate_copper_ore
- raw_copper_block
- diamond_ore
- deepslate_diamond_ore
- gold_ore
- deepslate_gold_ore
- iron_ore
- deepslate_iron_ore
- raw_iron_block
- lapis_ore
- deepslate_lapis_ore
- redstone_ore
- deepslate_redstone_ore
replacement-blocks:
# Chest is a tile entity and can't be added to hidden-blocks in engine-mode: 2.
# But adding chest here will hide buried treasures, if max-chunk-section-index is increased.
- chest
- amethyst_block
- andesite
- budding_amethyst
- calcite
- coal_ore
- deepslate_coal_ore
- deepslate
- diorite
- dirt
- emerald_ore
- deepslate_emerald_ore
- granite
- gravel
- oak_planks
- smooth_basalt
- stone
- tuff
# Other default world-settings.
# world_nether: needs to be changed if your world is named differently.
world_nether:
anti-xray:
max-chunk-section-index: 7
max-block-height: 128
hidden-blocks:
# See note about air above.
- air
- ancient_debris
- bone_block
- glowstone
- magma_block
- nether_bricks
- nether_gold_ore
- nether_quartz_ore
- polished_blackstone_bricks
replacement-blocks:
- basalt
- blackstone
- gravel
- netherrack
- soul_sand
- soul_soil
# world_the_end: needs to be changed if your world is named differently.
world_the_end:
anti-xray:
enabled: false
[1] This picture was made by the user Oberfail#2096 on the PaperMC Discord.
@LucidAPs thats basically engine 1.