[MC-83137] Skeleton's arm goes into body when shooting arrows

The bug

The Skeletons arm goes into his body when shooting arrows. It might be harder to see in the latest versions but can still be reproduced rather easily when the skeleton is riding another entity.

How to reproduce

Summon a skeleton which is riding another entity

/summon armor_stand ~ ~ ~ {Invulnerable:1b,Passengers:[{id:"skeleton",HandItems:[{id:"bow",Count:1b}]}]}

Switch to Survival mode and move very close to the skeleton around it

Linked issues

is duplicated by 1

MC-86132 Skeleton Bow Goes Through Skeleton Body When Moving Around It Resolved

relates to 2

MC-139528 Pillagers/piglins arm move into their heads Open

MC-163963 The position of potions held by witches is determined by their head rotation Open

Attachments

MC-83137.mp4

Skeleton arm intersecting with body (17w06a).png

Comments 24

user-f2760 2015-07-29T15:25:54Z

confirmed, but proboply won't fix
also it's a skeleton, he can just put his arms trought his ribs 😃

Anon Ymus 2015-07-30T01:21:34Z

Confirmed.

user-f2760 2015-11-01T12:01:40Z

confirmed for 15w44b

marcono1234 2017-02-15T17:36:36Z

~~Seems to be fixed in 17w06a and probably earlier versions.~~

Oval 2018-09-19T15:38:29Z

Confirmed for 1.13.1.

14 more comments

Avoma 2021-12-17T19:01:45Z

Can confirm in 1.18.1.

Avoma 2022-05-10T17:29:25Z

Can confirm in 1.18.2 and 22w18a.

Avoma 2022-08-19T15:49:40Z

Can confirm in 1.19.2.

[Mod] Jingy 2024-04-23T22:23:00Z

I'd suggest resolving this as a duplicate of MC-96138, as it describes the issue more generally. This issue has also not been well maintained by its owner over the years (since 2016).

If not a duplicate, at least add 'caused by MC-96138'

Ampflower 2024-06-29T09:06:41Z

Can confirm in 1.21 with a skeleton and player in a boat. It however doesn't apply to illusioners, despite having a bow, as they use a different pose when firing.

For the relation of MC-96138, I'd say it'd only be a 'caused by', as the boat is a second cause, and can happen with a player model as well.

Doing a bit of code analysis, HumanoidModel's poseLeftArm and posRightArm functions sets up how the arm should be posed, including on the case of BOW_AND_ARROW. It maybe possible to adjust the math to not have the arm clip through the body, although clamping the rotation of the arm may suffice too.