MC-74907Iron Golems can hurt players and mobs through walls
When you provoke an Iron Golem it can still attack you through a wall, even if it is built out of solid blocks
Environment
Macintosh OSX Mavericks, Java 1.6.0
Linked Issues
Created Issue:
Iron Golems can hurt players and mobs through walls
When you provoke an Iron Golem it can still attack you through a wall, even if it is built out of solid blocks
Environment
Macintosh OSX Mavericks, Java 1.6.0
relates to
MC-71834is a completely separate bug but has a similar effect, so maybe should be marked as related?
duplicates
relates to
![[Mod] markderickson](../../../data/avatars/users/18946.svg){kind=small}
The bug
Mobs can attack you through blocks and corners due to miscalculation of attack radius.
How to reproduce
- Build a completely sealed off house with no windows or doors from opaque blocks like planks or cobblestone or the like, leave some blocks in the inventory for you to place in step 7.
- Make a two-block tall one-block wide empty doorway in the wall for you to go through and to seal off with blocks in step 7.
- Outside the house, spawn a Ravager.
- Switch to survival mode.
- The Ravager should start going for you.
- Run in the house, let it hit you once through the empty doorway.
- Seal off the doorway with two blocks.
Result: The Ravager is still able to hit the player, from about two blocks away, with a complete wall every possible place in between.
Expected: The Ravager can't attack the player any more.
Example
An example can be seen in this comment.
Old example
I just created a villager in MCEdit with the Create Shops filter to have a custom shop. I saved it and launched MC. The villager started to run around normally in his house but then he went to the door where a zombie was knocking at (wooden door on normal difficulty) and the villager blinked red and got damage and after a few hits he died. The zombie killed him through a closed door and the villager did not run away he always came back to the door until he died.
Additional informations
From KingSupernova:
There are a number of bug reports about attack radius that are all very similar. MC-2310, MC-18326, MC-50668, MC-63965, MC-71834, and MC-74907 are all about the attack radius of mobs extending through blocks. (Some mobs are more bugged than others, but it’s the same basic problem).
There are also a few related issues:
MC-1297is the same as the above, but for players.- MC-3059 is the same as the above, but for arrows.
Code analysis
Based on 1.11.2 decompiled using MCP 9.35 rc1
The problem seems to be the method net.minecraft.entity.ai.EntityAIAttackMelee.checkAndPerformAttack(EntityLivingBase, double) and methods overriding it. They all only test if the mob to attack is in a certain radius to the attacker without testing if blocks are between them.
Possible solutions
Bounding box check
The current behavior would be replaced by only allowing mobs to attack other mobs when their bounding boxes intersect.
Ray casting
The current behavior would be extended to require a ray cast from the attacker to the mob to attack (excluding liquids and blocks without collision box) to return no colliding blocks. Possible use y + height / 1.5 as attack height or have a method for mobs to define their attack height(s?). The height at which the mob to attack will be attacked could for example be y + height / 2 or with multiple tries depending on the height of the mob, for example
for (int attackFraction = 0; attackFraction < height / 2; attackFraction++) { double attackHeight = y + height * ((attackFraction + 1.0) / (height / 2.0 + 1.0)) }
There are a number of bug reports about attack radius that are all very similar. MC-2310, MC-18326, MC-50668, MC-63965, MC-71834, and MC-74907 are all about the attack radius of mobs extending through blocks. (Some mobs are more bugged then others, but it’s the same basic problem). There are also a few related issues:
MC-1297 is the same as the above, but for players.
MC-3059 is the same as the above, but for arrows.
Most or all of these reports should be consolidated into one, as they are all caused by the same base issue.
There are a number of bug reports about attack radius that are all very similar. MC-2310, MC-18326, MC-50668, MC-63965, MC-71834, and MC-74907 are all about the attack radius of mobs extending through blocks. (Some mobs are more bugged then others, but it’s the same basic problem). There are also a few related issues:
MC-1297 is the same as the above, but for players.
MC-3059 is the same as the above, but for arrows.
Most or all of these reports should be consolidated into one, as they are all caused by the same base issue.
There are a number of bug reports about attack radius that are all very similar. MC-2310, MC-18326, MC-50668, MC-63965, MC-71834, and MC-74907 are all about the attack radius of mobs extending through blocks. (Some mobs are more bugged then others, but it’s the same basic problem). There are also a few related issues:
MC-1297 is the same as the above, but for players.
MC-3059 is the same as the above, but for arrows.
Most or all of these reports should be consolidated into one, as they are all caused by the same base issue.
There are a number of bug reports about attack radius that are all very similar. MC-2310, MC-18326, MC-50668, MC-63965, MC-71834, and MC-74907 are all about the attack radius of mobs extending through blocks. (Some mobs are more bugged then others, but it’s the same basic problem). There are also a few related issues:
MC-1297 is the same as the above, but for players.
MC-3059 is the same as the above, but for arrows.
Most or all of these reports should be consolidated into one, as they are all caused by the same base issue.
There are a number of bug reports about attack radius that are all very similar. MC-2310, MC-18326, MC-50668, MC-63965, MC-71834, and MC-74907 are all about the attack radius of mobs extending through blocks. (Some mobs are more bugged then others, but it’s the same basic problem). There are also a few related issues:
MC-1297 is the same as the above, but for players.
MC-3059 is the same as the above, but for arrows.
Most or all of these reports should be consolidated into one, as they are all caused by the same base issue.
There are a number of bug reports about attack radius that are all very similar. MC-2310, MC-18326, MC-50668, MC-63965, MC-71834, and MC-74907 are all about the attack radius of mobs extending through blocks. (Some mobs are more bugged then others, but it’s the same basic problem). There are also a few related issues:
MC-1297 is the same as the above, but for players.
MC-3059 is the same as the above, but for arrows.
Most or all of these reports should be consolidated into one, as they are all caused by the same base issue.
There are a number of bug reports about attack radius that are all very similar. MC-2310, MC-18326, MC-50668, MC-63965, MC-71834, and MC-74907 are all about the attack radius of mobs extending through blocks. (Some mobs are more bugged then others, but it’s the same basic problem). There are also a few related issues:
MC-1297 is the same as the above, but for players.
MC-3059 is the same as the above, but for arrows.
Most or all of these reports should be consolidated into one, as they are all caused by the same base issue.
There are a number of bug reports about attack radius that are all very similar. MC-2310, MC-18326, MC-50668, MC-63965, MC-71834, and MC-74907 are all about the attack radius of mobs extending through blocks. (Some mobs are more bugged then others, but it’s the same basic problem). There are also a few related issues:
MC-1297 is the same as the above, but for players.
MC-3059 is the same as the above, but for arrows.
Most or all of these reports should be consolidated into one, as they are all caused by the same base issue.
iron golems have a huge attack range, might be intended
There are a number of bug reports about attack radius that are all very similar.
MC-2310,MC-18326,MC-50668,MC-63965,MC-71834, andMC-74907are all about the attack radius of mobs extending through blocks. (Some mobs are more bugged then others, but it’s the same basic problem). There are also a few related issues:MC-1297is the same as the above, but for players.MC-3059 is the same as the above, but for arrows.
Most or all of these reports should be consolidated into one, as they are all caused by the same base issue.