Ball-shaped parts have jittery physics on mobile devices

Bug Reports Engine Bugs
#1

I found some weird behaviour of physics in this situation:

A 6x6x6 ball-shaped part is network-owned by a player in a Roblox server. This player is a mobile device player, PC players do not have this bug. The player pushes the 6x6x6 ball into a 1x1x1 stud, which is 3 studs off the ground. If the ball collides with the stud on its corner, the ball jumps back in a sudden way. If the ball still is being pushed, the ball will be part of a loop of colliding with the corner, jumping back, colliding with the corner, etcetera.

Video proof: Roblox physics glitch video proof (youtube.com)

Try it out yourself here: Sphere physics mobile jitter test - Roblox

Is this an engine bug? If not, how can I fix it?

1 Like
#2

Hi! Thanks for posting this, another user posted your bug on the dev forum a few weeks ago: Physics objects snapping back and forth on mobile

You’ve discovered a very intriguing bug! This is definitely an engine bug, and we think it’s a memory issue that only occurs on devices with ARM processors. We are investigating and hope to have a fix soon!

Thanks