[MC-92019] Shields don't block anything if facing straight down

The bug

Shields suffer from a sort of gimbal lock: if a player faces straight down, the shield doesn't block any direction. Straight up seems to work ok in my testing, probably due to rounding error of some sort making the facing-vector still have a slight horizontal component.

How to reproduce

Summon a trapped skeleton and stand above and slightly to the side. Arrows are blocked when facing 89.9 down (or at -89.9 almost straight up), but at 90.0 you'll be hit.

Linked issues

relates to 2

MC-92017 Shield damage direction is incorrect Resolved

MC-109101 Shields do not block damage while the player faces straight up Resolved

Comments 6

kumasasa 2015-11-02T22:58:00Z

This was MC-86283, but it was too confusing for Kumasasa so he closed it as invalid.

It wasn't too confusing for me but I did explain you the most basic rule of this bug tracker Submit ONE issue per report please (to be found on the frontpage)

Anomie X 2015-11-04T01:24:24Z

Depends on how you define "one issue".

SunCat 2016-02-13T21:13:45Z

Confirmed for 16w06a

bob 2016-11-06T11:09:45Z

Is this still an issue in the latest snapshot 16w44a? If so please update the affected versions.

This is an automated comment on any open or reopened issue with out-of-date affected versions.

bemoty 2017-08-11T01:31:07Z

Can confirm for MC 1.12.1.

Oval 2018-09-14T11:26:15Z

Confirmed for 1.13.1 partly, when facing 90 down the shield will block the arrow, if you face 90 up than it will not block the arrow.

You can test it with these commands:

/tp @s ~ ~ ~ 180 90
/tp @s ~ ~ ~ 180 -90